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  • Review
    Cong ZHANG, Jie LIU, Shuyi XIE, Bin XU, Haiqing YIN, Binbin LIU, Xuanhui QU
    Journal of Materials Engineering. 2023, 51(3): 1-16.

    High-entropy alloys have attracted great attention in various fields due to their high-entropy effect, severe lattice distortion, slow diffusion and special and excellent material performance due to the combination of various alloying elements in equal or near-equal molar proportions. Its high strength and hardness, fatigue resistance, excellent corrosion resistance, radiation resistance, near-zero thermal expansion coefficient, catalytic response, thermoelectric response and photoelectric conversion make high-entropy alloys have potential applications in many aspects. High-throughput computation and machine learning technology have rapidly become powerful tools to explore the huge composition space of high-entropy alloys and comprehensively predict material properties. The basic concepts of high-throughput computing and machine learning were introduced in this paper as well as the advantages of first-principles calculation, thermodynamic/kinetic calculation and machine learning in the research of high-entropy alloys. The application research status of high-entropy alloy composition screening, phase and microstructure calculations and performance prediction were summarized. In the final part, the existing problems, and the solutions and future prospects of this field were summarized, including developing tools for first-principles calculations and machine learning of high-entropy alloys, building high-quality databases for high-entropy alloys and integrating high-throughput computing with machine learning to globally optimize the mechanical property and service performance of high-entropy alloys.

  • Review
    Xin MA, Haitao LIU, Xun SUN
    Journal of Materials Engineering. 2023, 51(8): 1-11.

    Continuous fiber reinforced and toughened ceramic matrix composites (CMCs) are key thermal structural materials in aerospace and other fields. Mechanical connectivity, as one of the most reliable connectivity methods, is an essential method to achieve connectivity of large and complex CMCs components. At present, research on CMCs joints is rapidly developing, but there is few comprehensive review literature on CMCs joints. Based on the research work in the field of CMCs joints in recent years, the preparation and mechanical property characterization methods of CMCs fasteners were summarized in this paper, the damage and failure mechanism of CMCs fasteners were systematically stored and discussed, and focusing on the influencing factors and laws of mechanical properties of CMCs fasteners from the perspective of material properties and external environment. The research work on CMCs mechanical joints was presented, and the damage law, failure mechanism, finite element simulation and reliability of CMCs connectors were prospected.

  • Review
    Sufang TANG, Jia YANG, Pengju TANG, Chenglong HU
    Journal of Materials Engineering. 2023, 51(3): 17-28.

    Cf/SiC composites are considered as one of the most important candidates for aerospace thermal protection systems because of their low density, high specific strength, good thermal shock, oxidation and ablation resistance, and excellent high temperature strength retention. However, Cf/SiC composites are prone to oxidize at a temperature above 500 ℃ due to inevitable fabrication defects. So it is necessary to carry out effective oxidation protection for the composites. Oxidation resistant coating is an efficient technology to realize long-term oxidation protection. Based on harsh requirement of thermal protection systems, the research progress of anti-oxidation coatings for Cf/SiC composites was summarized, mainly focusing on the coating material systems and their preparation technologies. Improving the service temperature (≥1800 ℃) and bonding strength of the coatings is an important issue to be solved at present.The preparation of multi-functional coating with longer service time and higher service temperature, as well as oxidation resistance, water vapor corrosion resistance and even good heat insulation performance is an important direction for future development.

  • Review
    Furong YAN, Yaxian LIU, Lingyuan FAN, Mei ZHANG, Min GUO
    Journal of Materials Engineering. 2023, 51(9): 1-12.

    The pollution of heavy metal ions in wastewater has caused serious harm to human health, and the adsorption method has attracted much attention because of its high efficiency, economy, simplicity, and good selectivity. SiO2 aerogel is a potential adsorbent for removal of heavy metal ions in wastewater due to its high specific surface area (>500 m2/g), high porosity (>80%), controllable surface group and good physical/chemical stability. Herein, the preparation methods of SiO2 aerogel and its effect on microstructure were briefly introduced, focusing on the functionalization methods of SiO2 aerogel and the adsorption performance and factors of functionalized SiO2 aerogel for the adsorption of heavy metal ions in wastewater, and the adsorption mechanism and adsorption kinetics process of functionalized SiO2 aerogel as heavy metal ions adsorbent were analyzed. It was pointed out that the controllable preparation with low cost and short process, effective functionalization and efficient adsorption of various heavy metal ions are the future development directions of SiO2 aerogels as absorbent.

  • Review
    Wenzhe LI, Feng QIAN, Xingwang CHENG
    Journal of Materials Engineering. 2023, 51(3): 29-38.

    Aluminum alloy is an important light metal structural material, which has been widely used in aerospace and transportation industries. Wrought aluminum alloys generally require extrusion, rolling or forging after casting to be processed into finished products. However, this conventional casting-deforming-cutting subtractive manufacturing route has become increasingly difficult to meet the manufacturing demands of high efficiency and environmental sustainability. As an emerging manufacturing method, additive manufacturing (AM) provides brand-new possibilities for the manufacturing of aluminum alloys by depositing subsequent layers based on digital drawing files to make three-dimensional objects. However, most aluminum alloys are suffering from the various defect issues due to the manufacturing characteristics of laser-based AM processes and several intrinsic properties of aluminum alloys, which impair their mechanical properties and limit their industrial applications. Various defects and corresponding causes in additively manufactured medium- and high-strength aluminum alloys were reviewed in this paper. In addition, latest researches on eliminating defects and thus improving mechanical properties of AM aluminum alloys were summarized from three aspects: process parameter optimization, alloy composition optimization and nucleant agent addition. This work demonstrates that processing parameter and alloy composition should be regulated synergistically to improve the microstructures and mechanical properties of additively manufactured medium- and high-strength aluminum alloy, and the optimal heat treatment should also be inve-stigated.

  • Metal Additive Manufacturing Technology Column
    Jingxin ZHAO, Zhenhua DAN, Zhonggang SUN, Chonghong ZHANG, Hui CHANG
    Journal of Materials Engineering. 2023, 51(5): 1-13.

    Stress corrosion cracking (SCC), as an important research direction in the interdisciplinary of material mechanics and corrosion electrochemistry, is one of the main failure modes of stainless steel components. Compared with traditional wrought technology, additive manufacturing (AM) 316L stainless steel has complicated microstructure and inherent defects including pores and lack of fusion places (LOF) caused by additive manufacturing process, resulting in more complex SCC behavior. Herein, the basic SCC behavior of 316L stainless steel was discussed in detail on the basis of the researches of AM316L stainless steel at home and abroad. The main contents include two stress corrosion mechanisms of hydrogen induced cracking and anodic dissolution. Two behavior of transgranular cracking and intergranular cracking were described. The effects of microstructure on SCC behavior of AM316L, including twins, different crystal interface, pores, LOF, and element segregation were summarized. The current situation and advantages of three in-situ characterization methods, including electrochemical noise, high-resolution neutron diffraction and three-dimensional morphology characterization were introduced, which are of great significance to explore the SCC behavior of AM316L. Finally, the prospective future of the research directions of SCC behavior of additive manufacturing stainless steel were proposed, including the research of SCC characteristics under high temperature irradiation environment and the principle of stress distribution and restructuration at crack tips.

  • Energy Conversion Materials And Devices Column
    Yufu HUANG, Cheng CHEN, Xueling ZHAO, Donghai LIN
    Journal of Materials Engineering. 2023, 51(6): 1-11.

    MXenes are a new type of two-dimensional layered transition metal carbides and nitrides prepared by selective etching of MAX phase materials. Due to their excellent physical, electronic and chemical properties, MXenes have been widely used in electromagnetic shielding, biomedicine, energy storage, sensors, water purification and other fields. At the same time, MXenes and their composites can effectively improve the catalytic efficiency of noble metal catalysts or directly serve as a class of non-precious metal catalysts due to their large specific surface area, excellent electrical conductivity and stability, and are regarded as a promising class of fuel cells electrocatalysts or supports. The structure, properties and preparation methods of MXenes were introduced in this paper, and the latest application research results of MXenes and their composites in the fields of oxygen reduction, formic acid oxidation, methanol oxidation and ethanol oxidation reactions were overviewed, and the main problems existing in MXenes materials were pointed out (for example, it is difficult to preparing uniformly dispersed multi-layer MXenes flakes or few or even single-layer MXenes flakes, which are easy to re-stack due to higher surface energy, etc.), preparing more new MXenes and composite them with various materials were put forward, in order to promote the application of MXenes and their composites in the field of fuel cells.

  • Review
    Peiyong LI
    Journal of Materials Engineering. 2023, 51(4): 67-87.

    Since the 1960s, aluminum matrix composites have been being investigated globally, and series of high-performance aluminum matrix composites, namely, damage tolerance, corrosion resistance, high-strength, heat resistance and low-thermal expansion aluminum matrix composites, have been developed. These composites have been used in the fields of aviation, aerospace, electronics and transportation. However, the present market for the application of high-performance aluminum matrix composites is still small, as compared to conventional metal materials and polymer matrix composites. In this paper, the advancements in reinforcements, aluminum matrix, processing methods, microstructure, properties and applications for high-performance aluminum matrix composites were reviewed. The problems existing in raw material, engineering, quality stability, property data, cost, application and materials development were discussed. Future directions from the aspects of applied basic research, materials development, engineering and applications were presented. The future directions for high-performance aluminum matrix composites include increasing the quality of raw materials, improving the stability of processing, lowering the cost, strengthening engineering, expanding applications, exploring the additive manufacturing plus die forging process, and developing new-generation nano reinforced and nano/micro hybrid reinforced aluminum matrix composites.

  • Micro-Nano Structure Catalytic Materials Column
    Yujing WANG, Man LIU, Jianting SI, Ting ZHANG, Geng REN, Shouning CHAI
    Journal of Materials Engineering. 2023, 51(4): 1-14.

    In recent years, the global environmental problems caused by excessive emissions of carbon dioxide(CO2) have become severe gradually, which attract widespread concern all over the world. The electrochemical reduction of CO2 to clean energy and high-value chemicals not only can effectively alleviate greenhouse effect, but also provide an alternative to solve the energy crisis. The reaction principle of electrochemical reduction of CO2 was briefly described in this review, and some binary metal catalysts with high product selectivity reported in recent years were classified and summarized. The influences of the bimetallic materials physico-chemical properties, including element and composite, atomic ratio, microscopic morphology, particle size, etc. on CO2 reduction performance were reviewed, and the explanation of high selectivity for partial typical catalysts derived from DFT calculation was presented. Finally, the main problems and future research challenges for the selective conversion of CO2 on bimetallic catalysts with high efficiency were also discussed.

  • Research Article
    Zhengxing ZHU, Xiubo LIU, Yifan LIU, Yuan MENG, Haibin ZHOU, Shihong ZHANG
    Journal of Materials Engineering. 2023, 51(3): 78-88.

    High-entropy alloy coatings show great potential for improving the wear resistance of the stainless steel substrate. To investigate the effects of Cu/Si doping on the microstructure and high temperature tribological properties of FeCoCrNi high-entropy alloy coating, FeCoCrNiCux and FeCoCrNiSix series of high-entropy alloy coatings were prepared on the 304 stainless steel by laser cladding.The microstructure and phase distribution of the coatings were characterized by XRD, SEM and EDS, and the high temperature tribological properties of the coatings were tested by a high temperature friction and wear tester. The results show that both FeCoCrNiCux and FeCoCrNiSix high entropy alloy coatings form a single FCC-type solid solution with good metallurgical bonding to the substrate under suitable laser cladding parameters.The addition of Cu reduces the surface hardness of FeCoCrNi coatings, but improves the metallurgical bonding due to the increase of thermal conductivity of the coating; the addition of Si promotes grain refinement and improves the surface hardness of the coating. At 600 ℃, the addition of Cu/Si elements significantly improves the tribological properties of the coating, with the coefficients of friction of 0.24 and 0.19 for FeCoCrNiCu and FeCoCrNiSi coatings, respectively, and the wear rates are 1.58×10-4 mm3·N-1·m-1 and 6.77×10-5 mm3·N-1·m-1, respectively, which are 56.1% and 81.9% lower than FeCoCrNi coating.The main wear mechanisms of FeCoCrNiCu coating are oxidation wear, fatigue wear and slightly abrasive wear, while FeCoCrNiSi coating is oxidation wear.

  • Review
    Gang CHEN, Tao LUO, Hao WU, Xiaotian TANG
    Journal of Materials Engineering. 2023, 51(10): 1-12.

    High entropy alloys have been proposed in 2004, which are expected to be widely used in aerospace, petrochemical and other fields due to their excellent properties compared with the traditional alloys, and have become a hot spot in current metal material research. It has become one of the methods to improve the comprehensive properties of high entropy alloys by introducing suitable reinforcement phase into the high entropy alloy matrix, and to form high entropy alloy matrix composites (HEAMCs). In this review, according to the current research status in HEAMCs at home and abroad in the past few years, the reinforcement phase selection, preparation method, phase structure, microstructure and strengthening mechanism of HEAMCs were systematically introduced, and the evolution of properties of HEAMCs were summarized, including strength and plasticity, hardness, wear resistance and corrosion resistance. Finally, the challenges to HEAMCs were discussed and future research directions in HEAMCs were suggested.The wettability between the reinforcement phase and the matrix seriously affects the preparation and performance of large-scale composites, and finding an efficient and simple method to prepare large-scale composites is a problem that needs to be solved in high-entropy alloy matrix composites; reinforcing particles will lead to a decrease in plasticity, and the balance between strength and plasticity of metal matrix composites also needs to be studied.

  • Energy Conversion Materials And Devices Column
    Haiqin DAI, Daijun YANG, Pingwen MING, Bing LI, Cunman ZHANG, Dianlong WANG
    Journal of Materials Engineering. 2023, 51(6): 20-28.

    Proton exchange membrane fuel cell (PEMFC) usually need an activation process to obtain its best electrochemical performance.Compared with the traditional activation methods, electrochemical hydrogen pump has the advantages of saving time and hydrogen cost. The electrochemical hydrogen pump is a method in which hydrogen is oxidized into protons at the anode, and the protons migrate to the cathode with an applied electric field, and then are reduced to hydrogen again. The performance, internal impedance and electrochemical specific area(ECSA) changes of PEMFC after electrochemical hydrogen pump activation were studied with the help of polarization curves, electrochemical impedance spectroscopy(EIS) and cyclic voltammetry(CV) tests. Then the mechanism of the hydrogen pump activation was analyzed. Moreover, the influence of different current densities, inlet humidities and activation temperatures were investigated. The results show that after the hydrogen pump activation, the fuel cell performance is improved obviously, the slope of Tafel curve is decreased, the charge transfer resistance and mass transfer resistance get lower values, while the ohmic resistance is basically unchanged, and the ECSA is increased. Therefore, the mechanism of the hydrogen pump activation is related to the quantity of active species and microstructure of catalyst layer. The performance of hydrogen pump activation under 200 mA·cm-2 is better than that of under 100 mA·cm-2. The performance of hydrogen pump activation under the inlet humidity of 150%RH is better than that of 100%RH and 200%RH. In addition, the activation temperature has little impact on the PEMFC performance after hydrogen pump activation, and the fuel cell can be fully activated by hydrogen pump activation for 30 min at room temperature.

  • Research Article
    Xingyu LIU, Fan WAN, Shitao GAO, Yanfei WANG, Duan LI, Junsheng LI, Rongjun LIU
    Journal of Materials Engineering. 2023, 51(8): 155-161.

    Based on the self-made Zr0.5Hf0.5C precursor and commercial liquid polycarbosilane, C/Zr0.5Hf0.5C-SiC composite was successfully prepared by the precursor impregnation and pyrolysis(PIP) process. The influence of the thickness of pyrolytic C coating on the structure and bending properties of composite materials was studied. The results show that the self-made Zr0.5Hf0.5C precursor can be converted into Zr0.5Hf0.5C solid solution at a relatively low temperature of 1400 ℃. Because of its good permeability, the transformed Zr0.5Hf0.5C matrix exists in both the inter-bundle and intra-bundle regions of the C/Zr0.5Hf0.5C-SiC composite, which presents as a layered structure on SiC matrix. The phase composition of C/Zr0.5Hf0.5C-SiC composite mainly includes C, SiC and Zr0.5Hf0.5C. The densities of three groups of composites with different thicknesses of pyrolytic C coating (0.67, 0.84, 1.36 μm) are 2.07, 1.99, 1.98 g/cm3, respectively. SiC content in the composite decreases with the increase of the thickness of pyrolytic C coating. The three groups of composites with different thicknesses show pseudoplastic fracture mode during bending loading tests, bending strength, bending modulus and fracture toughness are above 410 MPa, 60 GPa and 15.6 MPa·m1/2, respectively. Good interface bonding and pre-introduced SiC matrix are the keys to obtaining excellent bending properties of C/Zr0.5Hf0.5C-SiC composites.

  • Review
    Wei LI, Riran LIANG, Lingni YANG, Panpan ZHAO, Xingyu CHEN, Haijun MAO, Zhuofeng LIU, Shuxin BAI, Weijun ZHANG
    Journal of Materials Engineering. 2023, 51(8): 12-22.

    Owing to the feature of ultrahigh power density, the dielectric capacitors play an increasingly important role in the field of industrial production, basic scientific research, aerospace, and military industry in recent years. However, the relatively low energy storage density of the dielectric capacitors generally leads to their big sizes, which is difficult to meet the miniaturization requirements of future devices. Polymer-ceramic nanocomposites can combine high permittivity of the ceramic fillers and the excellent breakdown strength of the polymer matrix, thus achieving excellent energy storage performance. At present, developing the polymer-ceramic nanocomposites with high energy storage density is the key to realize the miniaturization goal of dielectric capacitors in the future. The current research progress of polymer-ceramic nanocomposites for energy storage capacitor applications from three perspectives was systematically summarized, including regulation of the nanofillers, optimization of the interfaces, and design of the multilayer composite structure. Notably, the influences of the dimension, size, species, hierarchical structure of the nanofillers, interface optimization methods such as surface modification and core-shell structure construction, as well as multilayer structure design such as sandwich structure and gradient structure on the permittivity, breakdown strength and the energy storage density of the nanocomposites were introduced in detail. Meanwhile, the structure-activity relationships between the microstructure of nanocomposites and their energy storage properties were further analyzed and discussed. Finally, based on the challenges and shortcomings of the current research, the important development directions of this field in the future were proposed, including selecting the new 2D nanofillers, enhancing the energy storage efficiency, employing multimode combined optimization strategy, and constructing the corresponding dielectric capacitors.

  • Research Article
    Huiqu LI, Qingyuan XING, Mao RAO, Jingliang ZHANG, Jinxin ZANG
    Journal of Materials Engineering. 2023, 51(4): 113-121.

    The single-stage & two-stage solution and the single aging-tensile property curves at 110-135 ℃ were studied by using the 7A36 aluminum alloy extruded tube of ?250 mm×20 mm and ?340 mm×30 mm under industrial production conditions. The optimal heat treatment was adopted to compare the tensile properties of two kinds of aluminum alloy extruded tube.The phase transition temperature was measured by DSC, and the microstructure and tensile fracture were observed by OM, SEM and TEM.The results show that the tensile strength, yield strength and elongation of 7A36 alloy extruded tube can reach 696, 655 MPa and 14.0%, respectively, under the optimal heat treatment. Compared with the process of direct chill casting (DC) ingot & extrusion with high extrusion ratio, the size of grain and precipitated phase is smaller, the width of precipitation free zone is narrower under the process of forging ingot & conventional extrusion, which significantly affects the strength.At the same time, the alloy shows high quenching sensitivity. During solution treatment, quenching micro-cracks are easily induced near Fe-rich phase, which significantly affects the elongation of alloy extruded tube.

  • Composite Materials Welding Technology Column
    Xuhai XIONG, Mengyuan JIAO, Lin TIAN, Guiyang LI, Daosheng WANG
    Journal of Materials Engineering. 2023, 51(7): 1-11.

    Advanced polymeric composites (APC) are important structural materials for realizing the lightweight of aerospace vehicles. However, unfavorable factors such as low manufacturing efficiency, high cost, and serious energy consumption hinder the further expansion of APC applications. Resistance implant welding (RIW) technology has the advantages of simple equipment, high welding efficiency, energy saving and environmental protection, and is suitable for the connection of large structural parts with curved surface. It can replace the traditional bonding process and promote APC structural parts to realize green manufacturing, re-manufacturing and recycling. The research progress of APC resistance implant welding process and its application technology were presented in this paper. The challenges faced by APC resistance implant welding technology were introduced. The research status of thermoplastic composite RIW, process parameter optimization for welding pressure and welding time, implant types, thermosetting composite RIW and the application technology of RIW in the manufacturing of large APC structural parts were summarized systematically. The existing problems of APC resistance implant welding were pointed out, which relate to material design, process optimization and fixture manufacturing. In the future, the research on RIW technology of TPC structure is expected to focus on the development of higher strength welding binder, the design of HE with new structure and the improvement of interface bonding strength between binder and HE to improve the bearing capacity of joints. The research on mechanical constitutive model, fatigue strength and service life of RIW joints will be strengthened; the research on welding equipment and fixtures for specific APC components will be carried out to promote RIW engineering to fill the gaps in this area in China.

  • Zhen TIAN, Congcong LI, Yuan WU, Zhaoping LYU
    Journal of Materials Engineering. 2024, 52(1): 1-15.

    The development of nuclear reactor structural materials with excellent comprehensive performance is the basis of nuclear energy development, and it is one of the difficulties that have long restricted the promotion of nuclear energy. Multiprincipal element alloys(MEAs) have been recognized as candidate materials for advanced reactor structural materials due to their good irradiation resistance and mechanical properties, which has expanded a broad space for the design of new radiation-resistant materials. In recent years, the research on the irradiation damage of multiprincipal element alloys has tried to reveal the influence of some factors and characteristics of multiprincipal element alloys on the formation and evolution of defects in the irradiation process. For example, the type, number and concentration of alloying elements, lattice distortion, chemical short range order, etc. Although some existing research results show that the above factors can improve the resistance of multiprincipal element alloys to irradiation damage, under different irradiation conditions, the influence mechanism of the above factors on the formation and evolution of defects in multiprincipal element alloys is quite different, and it is difficult to draw generalization conclusions. Focusing on the four aspects of irradiation swelling, helium bubble formation, irradiation-induced element segregation and phase transition, irradiation hardening of FCC and BCC systems.The research progress of multiprincipal element alloys in irradiation damage in recent years was reviewed, the mechanism of action of multiprincipal element alloys to improve radiation resistance was summarized.And based on this, the future research directions for multiprincipal element alloys used in nuclear power structures were prospected, including tuning short-range order, high-entropy ceramics, additive manufacturing technology, accelerating development of new materials by integrating high-throughput computing with machine learning, etc. Finally, it is pointed out that new radiation-resistance MEAs must be designed based on the actual environment of material service from the perspective of composition design.

  • Review
    Guodong LIU, Zheng LI, Limin HAO, Jixian GONG, Jianfei ZHANG, Yongjun ZHANG
    Journal of Materials Engineering. 2023, 51(6): 52-65.

    Microneedles (MN) as a minimally invasive device consisting of a micro-raised array, can penetrate the cuticle to the epidermis and dermis, and which has the advantages of safety, painless, minimally invasive, self-administration and convenience. As a new kind of microneedles, hydrogel microneedles have attracted more attentions in the medical field due to its excellent performance. Hydrogel microneedles have good biocompatibility and mechanical properties, and can be completely removed after skin action without residual polymer in the body. Its unique swelling property can realize minimally invasive extraction of human detection substance and slow release of drugs, which can play a huge role in the field of personal health monitoring and drug controlled release in the future. The mechanism of action, design, preparation and application of hydrogel microneedles were reviewed in this paper, focusing on the current design parameters of hydrogel microneedles and their applications in drug delivery, extraction monitoring and wound healing, and the problems of hydrogel microneedles in skin infection risk, pharmacokinetics and wearing comfort were pointed out. In the future, the key research direction is to combine with intelligent devices to realize both human body monitoring and intelligent drug controlled release on the microneedle patch.

  • Review
    Qiang CHEN, Shun LI, Li'an ZHU, Shuxin BAI, Yicong YE
    Journal of Materials Engineering. 2023, 51(8): 46-55.

    As one kind of advanced high temperature structural and functional materials, it is necessary for fiber reinforced silicon carbide matrix composites (SiC CMCs) in the field of thermal management (TM) to combine the efficient heat transfer and high temperature heat resistance. Common fibers reinforced SiC CMCs, such as carbon fibers reinforced SiC CMCs (Cf/SiC or Cf/C-SiC), silicon carbide based fiber reinforced SiC CMCs (SiCf/SiC), etc., have a low degree of graphitization of the reinforcing fiber and are difficult to form an effective heat transport network. The latest research progress on the preparation and properties of fiber reinforced SiC CMCs with highly thermal conductivity was reviewed in this paper. The heat transport ability of fiber reinforced SiC CMCs can be improved by introducing highly thermal conductive phase, optimizing interfacial structure, making silicon carbide crystal coarse-grained, and designing preform structure. Moreover, the development of the fiber reinforced SiC CMCs with highly thermal conductivities was prospected, that is, comprehensively considering the factors that affect the performance of SiC CMCs, flexibly using the structure-activity relationship between the microstructure and properties of the composites, in order to prepare fiber reinforced SiC CMCs with stable size, excellent properties.

  • Review
    Hongtong DOU, Xiaoxu WANG, Xiaodong LIU, Diantang ZHANG
    Journal of Materials Engineering. 2023, 51(4): 88-102.

    In recent years, three-dimensional textile composites have been widely used in major national defense projects due to their excellent overall performance, rich structure, and net shape. Among them, the theoretical research of three-dimensional special-shaped textile composite materials is still far behind the application. Starting from the application of three-dimensional special-shaped textile composite material components, according to the typical characteristics of various components, the application status of three-dimensional special-shaped textile structural parts is summarized, and the main weaving process and weaving equipment development status of the three-dimensional special-shaped textile composite material preform were summarized. the research progress of the mechanical properties, meso-structure modeling and numerical simulation of 3D special-shaped textile composite materials from different levels at home and abroad were analyzed, and the key problems faced by the research of 3D special-shaped textile composite materials were put forward, aiming to provide support for the future applications of three-dimensional special-shaped textile composite materials.

  • Micro-Nano Structure Catalytic Materials Column
    Yixuan ZHOU, Dandan MA, Jianwen SHI
    Journal of Materials Engineering. 2023, 51(4): 15-28.

    Under the dual carbon target, the realization of CO2 photocatalytic/electrocatalytic reduction is a forward-looking strategy to alleviate the greenhouse effect and improve the utilization of carbon resources. However, as processes involving multiproton coupling, such as electron transfer, carbon-carbon coupling and hydrogenation, improving the conversion yield of CO2 and the selectivity of single product still face major challenges. Due to the good binding energy between Cu and CO, copper-based catalysts have great prospects in improving the efficiency of CO2 reduction. Taking nano-copper-based catalysts as the starting point, the effects of catalyst morphology, element doping and composite with other materials on CO2 reduction process were discussed in this review, when copper ions with different valence states were used as photo/electrocatalysts. The effects of different morphologies, doped elements and composite catalysts on catalysts containing Cu2+, Cu+ and Cu0 in the reaction process, and on the selectivity of reduction products and the corresponding Faraday efficiency were mainly discussed. Finally, some suggestions for research of copper based catalysts were put forward, including the mechanism analysis of Cu ion valence state on the formation of multi-carbon products, the preparation of high efficiency and single selectivity catalyst, and the use of advanced technology to control the types of products.

  • Research Article
    Yang XIANG, Chen MO, Zhihang PENG, Feng CAO, Jian FENG, Liangjun LI
    Journal of Materials Engineering. 2023, 51(8): 207-214.

    In order to meet the needs of large area thermal protection(≥1500 ℃)for high-speed aircraft, the high temperature resistant alumina fiber reinforced aerogel composite was used as the thermal insulation layer, and the carbon fiber fabric was used as the panel layer preform. Through the normal needle puncture process and the precursor impregnation pyrolysis process, the integrated TPS material for thermal protection was prepared, and the high temperature resistance performance tests were carried out to provide theoretical and technical support for the engineering application of materials. The results show that the integrated TPS material with good integrity and no obvious defects can be prepared by needle puncture suture technology and PIP process, and the density is only 0.6 g/cm3. When C/SiC composites are used in high-temperature oxidation environment, the oxidizing atmosphere diffuses into the material through defects such as pores and cracks, and oxidizes with carbon fibers, resulting in the degradation of composite properties. The material has excellent high temperature resistance, with mass ablation rate of 0.051 g/s and linear ablation rate of 0.077 mm/s; There is no obvious gap structure, and there is no obvious shrinkage on the whole, showing good high temperature resistance.

  • Review
    Yexuan CUI, Yana TONG, Weidong LIU, Zheng LI, Jixian GONG, Changsheng QIAO
    Journal of Materials Engineering. 2023, 51(9): 37-51.

    Hydrogel is a cross-linked three-dimensional network hydrophilic polymer material, which can absorb and retain a large amount of water and maintain a certain shape. In recent years, with the depletion of petroleum resources and the increasing attention of human beings to environmental issues, natural or modified polymer synthetic polymer hydrogels have become a research hotspot. Cellulose and its derivatives are a large class of renewable natural polymer materials, which have the characteristics of rich resources, wide variety, non-toxic and renewable, etc. The synthesized cellulose-based hydrogel has good water absorption, water retention, biocompatibility and biodegradability, etc., which can be used in medical, environment, agriculture and other fields. The research progress of the construction and application of cellulose-based hydrogels in recent years was reviewed in this paper. The microscopic network structure is combined with the macroscopic properties of the hydrogel. The mechanical properties, swelling properties and adsorption properties of the single network, interpenetrating network and semi-interpenetrating network cellulose-based hydrogels were summarized, and their applications in medical, environmental, agricultural and electronic fields were introduced. The development of cellulose-based hydrogels with both mechanical properties and biocompatibility, and the development of more green economic methods for the synthesis of cellulose-based hydrogels for industrial applications were proposed.

  • Research Article
    He XU, Yu WANG, Delin LIU, Jinwen ZOU
    Journal of Materials Engineering. 2023, 51(4): 122-131.

    In order to study the oxidation corrosion protection of key components of carrier aero engine, the high temperature oxidation behavior of the Ni-based powder metallurgy(PM) superalloys FGH4095 and FGH4096 in air at the temperature range of 750-1100 ℃ was investigated. The oxidation kinetics curves were determined by static weighing method. The structure, composition, and morphology of the surface oxide scale as well as its cross section were analyzed by metallographic microscope, scanning electron microscope (SEM), electron probe microanalyzer (EPMA) and X-ray diffractometer (XRD). The results show that two kinds of alloys belong to the grade of full oxidation resistance at 750-900 ℃ and oxidation resistance at 1000-1100 ℃. The actual service temperature of both alloys is below 900 ℃, so they exhibit excellent oxidation resistance in their operating temperature range.At 750-900 ℃, the oxidation resistance of the two alloys is similar without obvious difference. The oxide film is intact without peeling.The oxide films of FGH4095 and FGH4096 are composed of two layers after high temperature oxidation. The internal layer is mainly Al2O3.The outer layer of FGH4095 is composed of Cr2O3, Nb2O5 and TiO2. The outer layer of FGH4096 is composed of only Cr2O3 and TiO2.At 1100 ℃, both alloys are obviously oxidized and a large number of oxide scales crack. Due to the different compositions of the alloys, the oxidation resistance of the two alloys varies greatly at this temperature.In contrast, FGH4095 alloy exhibits better oxidation resistance.

  • Review
    Zhiming XU, Yiping YU, Song WANG, Wei LI
    Journal of Materials Engineering. 2023, 51(8): 23-32.

    SiC fiber-bonded ceramics (FBCs), as a new thermal-structural material obtained by hot-pressing sintering of SiC fiber, has low porosity, high fiber volume fraction, high temperature resistance, oxidation resistance and high strength. It is an excellent candidate material for high temperature components such as turbine blades and rotors of aero-engine. The research progresses of FBCs were systematically reviewed in this paper. The structural characteristics and preparation methods of two types of FBCs (Tyranohex and SA Tyranohex) were introduced, the relationships among the composition, structure and performance of FBCs were discussed. It was noted that the interface carbon layer plays a crucial role in the performance of FBCs. The mechanical properties of SA-Tyranohex at room temperature and high temperature were highlighted, and the reasons for its excellent high temperature performance were analysed. The examination, verification and application development were summarized. The difficulties of FBCs in forming complex components were pointed out, and the future development trends and research directions were prospected. Finally, it was proposed that conducting research on SiC fiber-bonded ceramics is of great significance for the development of new materials for high-temperature resistant components in China.

  • Research Article
    Yiqiang HE, Qianhang SU, Changbao HUAN, Wen FENG, Feng SHANG, Lijie ZUO, Yunfei DING, Yan WANG, Yifan ZHANG, Yuxue MU
    Journal of Materials Engineering. 2023, 51(3): 67-77.

    AlFeNiCrCoTi0.5 high entropy alloy powder was prepared by mechanical alloying, and (AlFeNiCrCoTi0.5)p/6061Al composites were prepared by cold isostatic pressing combined with equal-channel angular pressing. The alloying behavior between elemental metals and effects of milling time on powder morphology of high entropy alloy were investigated. The microstructure and properties of (AlFeNiCrCoTi0.5)p/6061Al composites with different volume fractions were analyzed. The results show that the alloying time of AlFeNiCrCoTi0.5 metal powder increases with the increase of melting point of the elements. The higher the melting point of the elements, the earlier the alloying. AlFeNiCrCoTi0.5 metal powder is fully alloyed and forms a FCC+BCC two-phase solid solution structure after 70 h ball milling time. A transition layer of element infiltration of elements is formed between Al matrix and the reinforcement. With the increase of the volume fraction of reinforcement, the agglomeration of reinforcement is intensified, the tensile strength increases and the plasticity decreases. When the volume fraction is 10%, the composites have good comprehensive properties. Compared with 6061 aluminum matrix, the tensile strength increases by 21.8% and the elongation decreases by 7.4%. For the composites after T6 treatment, the tensile strength and the elongation are 284.05 MPa and 11.51%, respectively.

  • Review
    Xiaofang YANG, Lei SHI, Wenyu WANG, Xin JIN, Jiarong NIU, Zhengtao ZHU, Tong LIN
    Journal of Materials Engineering. 2023, 51(3): 39-51.

    With the development of high temperature fields, such as automotive, petroleum, nuclear power and aerospace, piezoelectric materials with wide temperature range, as the core component of nondestructive testing and sustainable self-powered equipment used in these extreme environments, have become the hotspot of research in recent years. However, even the piezoelectric materials with wide temperature range owning excellent piezoelectricity and high temperature stability, the devices made of them could not have both flexibility and high-temperature resistance due to the embrittlement and hardness, resulting in the limitation in the application of high temperature precision operation and wearable health testing. Therefore, the flexible design of piezoelectric materials with wide temperature range, which can realize the preparation of high-temperature resistant, soft piezoelectric device and ultimately broaden the high temperature potential of device, become an important development direction for piezoelectric field. The research progress of piezoelectric materials with wide temperature range was introduced first in this paper, which includes materials (PZT, BT, KNN) used in the environment below 300 ℃ and Ⅲ-N material used in 500-1000 ℃. Then the flexible design technology was collected based on these materials, including direct-growth, growth-transfer and nano-composite. In the meantime, the influence of types of substrates or composite matrix on the high-temperature stability of final device was also analyzed.

  • Research Article
    Shuai LEI, Shanlong FU, Yu XING, Jun LI, Daijun ZHANG, Xiangbao CHEN
    Journal of Materials Engineering. 2023, 51(4): 132-140.

    The performance change and mechanism of polyimide composites with carbon fiber sizing and desizing states during thermal aging at 330 ℃ were compared and analyzed from the aspects of thermal oxidation mass loss, surface morphology and micro morphology, mechanical properties and glass transition temperature. The results show that carbon fiber desizing can reduce the mass loss rate of thermal oxidation of polyimide composites. The interface layer of the composites with sizing carbon fiber contains epoxy sizing agent, which has low temperature resistance. Therefore, the interface is easy to be damaged in the process of thermal aging, resulting in more cracks and rapid separation of edge fibers. Although the composites with sizing carbon fiber has high interlaminar shear strength before aging, it decreases rapidly in the early stage of thermal aging. On the contrary, the interlaminar shear strength of the composites with desizing carbon fiber is higher after aging for 200 h. The bending strength of the two composites before aging is basically the same, but the bending strength of the composites with sizing carbon fiber decreases rapidly in the early stage of aging; however, desizing has little effect on bending modulus. The glass transition temperature of the composites with desizing carbon fiber increases by about 15 ℃. After thermal aging, the glass transition temperature of the composites with sizing carbon fiber increases slightly, while the composites with desizing carbon fiber remain unchanged. Therefore, the high temperature desizing treatment of carbon fiber is conducive to improving the stability of polyimide composites for long-term use at high temperature.

  • Micro-Nano Structure Catalytic Materials Column
    Chiyao TANG, Xian WEI, Chongchen WANG
    Journal of Materials Engineering. 2023, 51(4): 48-56.

    Zeolitic imidazolate frameworks-8 (ZIF-8) as precursor was calcined at high temperature to prepare N-doped carbon (ZIF-NC). ZIF-NC/PTCDA (PxZy) was fabricated by facile ball milling from the as-prepared ZIF-NC and organic semiconductor 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). The morphology and structure of ZIF-NC and PTCDA were characterized by powder X-ray diffraction (PXRD), fourier transform infrared (FTIR), scanning electron microscopy (SEM), UV-Visible diffuse reflectance spectra (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS), etc. The norfloxacin degradation performance via the photocatalysis-activated sulfate radical-advanced oxidation process (SR-AOP) over PTCDA/ZIF-NC composites with different proportions was studied. The influences of pH value, peroxydisulfate (PDS) dosage and coexisting ions on the norfloxacin degradation over P120Z80 were investigated. After three cycles, the material still maintains good degradation efficiency for norfloxacin. The stability of PTCDA/ZIF-NC was further affirmed by PXRD, FTIR and SEM, etc. Finally, the mechanism of photocatalysis-activated SR-AOP for norfloxacin degradation was proposed, which was clarified by electrochemical tests and active substance capture experiments.

  • Research Article
    Jian YU, Jiarong LI, Xiang FANG, Qiang WANG, Shizhong LIU, Mei HAN
    Journal of Materials Engineering. 2023, 51(9): 60-66.

    The effect of secondary γ' phase evolution on the creep properties of single crystal superalloy DD6 was investigated at 760℃/785 MPa and 980℃/250 MPa by FESEM and TEM. The results indicate that the secondary γ' phases in DD6 alloy with standard heat treatment are precipitated in the matrix channel after exposure at 1120℃/4 h/AC. Since the secondary γ' phases in the matrix prevent the a/2〈011〉 dislocation gliding in the matrix channel and promote the {111}〈112〉 slip operated in the primary γ' phases at the beginning of creep at 760℃/785 MPa, the secondary γ' phases in the matrix channel decrease the incubation period and significantly improve the primary strain and creep rate. The secondary γ' phases in the matrix will dissolve rapidly at the beginning of creep at 980℃/250 MPa, therefore, the secondary γ' phases have no influence on the creep behaviour of 980℃/250 MPa.

  • Review
    Jigang ZHAO, He WANG, Junsheng ZHENG
    Journal of Materials Engineering. 2023, 51(9): 28-36.

    Lithium-ion capacitors are energy storage devices between lithium-ion batteries and supercapacitors, which have both high energy density and high power density, and are considered as one of the most promising energy storage systems. In this paper, the research progress of carbon-based and lithium-embedded cathode materials in recent years was summarized, and the classification and modification methods of carbon-based and lithium-embedded electrode materials were introduced in detail. In order to further improve the performance of lithium-ion capacitors, researchers further optimized the cathode materials by means of microstructure regulation, surface modification, doping modification and composite materials, and carried out cathode and anode dynamic matching to comprehensively improve the electrochemical performance of lithium-ion capacitors. Finally, the research hotspots and development directions of cathode materials for lithium-ion capacitors in the future were reviewed in order to provide good electrochemical properties for the next generation of cathode materials for commercial applications.

  • Review
    Weifeng KANG, Xin XING, Yu ZHANG, Dexuan YAN, Yanzi GOU
    Journal of Materials Engineering. 2023, 51(8): 33-45.

    SiC fiber is one of the common reinforcements for ceramic matrix composite (CMC) due to its superior characteristics such as low density, high tensile strength, excellent high temperature resistance and oxidation resistance. The preparation of coating on the surface of SiC fiber can not only improve the mechanical properties, high temperature resistance, oxidation resistance and electromagnetic functional properties of the fiber itself, but also effectively improve the bonding properties of the interface between the fiber and the matrix to promote the fracture toughness and mechanical properties of the composite. The preparation methods of surface coatings on SiC fiber were firstly reviewed in this paper by elaborating on the basic processes and related research progress of etching, deposition, chemical vapor infiltration, and precursor derived methods, and the advantages and disadvantages of different preparation methods were compared. Then the effects of coatings on SiC fibers and their reinforced composite materials were reviewed. Finally, the development trend of surface coating on SiC fibers was briefly summarized. The combination of experimental research and computational simulation can be used to simulate the real service environment of SiC fibers coatings, and the performance of fibers under extreme service conditions can be improved by preparing thermal barrier composite coatings.

  • Research Article
    Jun SHU, Minlin LU, Guofang ZHANG, Jianyi XU
    Journal of Materials Engineering. 2023, 51(3): 138-144.

    Ce0.92M0.08O2(M=La, Fe, Co, Mn) solid solutions were prepared by hydrothermal method, and the microstructure, spectral characteristics and redox properties of the solid solution were analyzed systematically. The results show that Co3O4 is observed in Co ion doped samples, and the other three ions are completely dissolved in CeO2 to form solid solutions. All of samples are nanosized, and the lattice constants are related to the radius of doped ions. The band gap energies of doped samples reduce significantly, and doped ions can increase the concentration of oxygen vacancies in the solid solutions. The orders of oxygen vacancy concentration are CeO2 < La < Fe < Co < Mn. Furthermore, the reduction peak temperatures of the doped samples are lower than that of pure CeO2, and the H2 consumption are significantly higher than that of the undoped samples.

  • Research Article
    Zijin CHANG, Jialing YAN, Yanchang QI, Bing CUI, Xiaotao CAI
    Journal of Materials Engineering. 2023, 51(3): 156-165.

    Aiming at the problem that surface cracks occur in the service of 15Cr2Mo1 heat resistant steel welds, NiCrFe alloy which was similar to the usage scenarios of this steel was employed to repair welds with different groove depths simulating crack depths. The feasibility of repair process was verified by the microstructure and performance characterization of the welds. The results show that repair welding at different groove depths is well formed and has no obvious defects, the weld metal is composed of austenitic cell dendrites and second phase precipitates, and there are a small amount of eutectic ferrite near fusion area, however, there is no ferrite in the bright white strip between the type Ⅱ boundary and the melting boundary. The increase of repair welding filler mainly reduces the yield strength of the joint, especially when the groove depth increases from 6.5 mm to 13 mm, the yield strength at room and high temperature is both greatly reduced by about 15%, then the decline trend slows down. With the increase of filler amount, the impact toughness of the fusion line and the 2 mm area outside the fusion line is improved, while the hardness of the whole weld decreases first and then increases with the increase of filler amount, which is related to the restraint of the repairing weld and the increase of precipitates formed by alloy element segregation.

  • Review
    Dongdong ZHAO, Bing WANG, Yuliang CHONG, Yunqiang ZHAO, Junjie ZHANG, Wenxuan QUAN, Jinliang ZHUANG
    Journal of Materials Engineering. 2023, 51(5): 58-75.

    Two-dimensional covalent organic frameworks (2D COFs) are ideal heterogeneous catalysts, and have been widely used in photocatalysis and electrocatalysis, owing to their high specific surface area, tunable porosity, facile functionalization, highly accessible and dispersed catalytic active sites. Starting from the rational design strategy of the structure and functionalization of COFs, synthetic methods for 2D COFs were reviewed, including solvothermal synthesis, mechanochemical synthesis, microwave synthesis, ionothermal synthesis, sonochemical synthesis, interfacial synthesis, and room temperature synthesis. Furthermore, recent progress of 2D COFs applications in photocatalysis and electrocatalysis was summarized, including hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, carbon dioxide reduction reaction, and photo/electrocatalytic organic conversion. Finally, the challenges of 2D COFs in photocatalysis and electrocatalysis were summarized, including high cost of organic ligands, difficulty of industrialization, the use of sacrificial agents, and a cooperative coupling reaction strategy was proposed based on photo/electroorganic synthesis and hydrogen evolution or oxygen evolution reactions.

  • Research Article
    Linyong ZENG, Jinji LIANG, Shiyong JIANG, Shiying ZHAN, Hailing HU, Zhicong SHI
    Journal of Materials Engineering. 2023, 51(5): 120-128.

    In order to develop lithium-ion batteries with high energy density, prelithium technology has attracted extensive attention. Li5FeO4was successfully prepared by molten salt method with LiNO3-LiOH mixed lithium salt as reaction medium and lithium source, and nano Fe2O3 as iron source in this work. Li5FeO4 as cathode prelithiation additive is applied to lithium-ion batteries. The synthesis conditions of Li5FeO4 were optimized by orthogonal experiment, and the effect of synthesis conditions on the electrochemical properties of the material was discussed. Li5FeO4 was added to the surface of LiFePO4 positive electrode and assembled with graphite negative electrode to form a full cell. Its effect on the electrochemical performance of the full cells and the mechanism of reducing the initial capacity loss of lithium-ion batteries were studied. The results show that Li5FeO4 cathode prelithiation additives with high purity, small particle size and outstanding electrochemical performance can be prepared by molten salt method. When Li5FeO4 with a mass fraction of 2.8%(based on the percentage of active materials mass) was added, the discharge specific capacity of first cycle for the LiFePO4/graphite full cell was 150 mAh·g-1 at 0.05 C, which was 8.5% higher than that without adding, after 100 cycles at 0.2 C. the capacity still increased by 7.1%, and the irreversible capacity of the svstem was restored.

  • Review
    Tianwen LIU, Dongqing LIU, Haifeng CHENG
    Journal of Materials Engineering. 2023, 51(8): 67-76.

    Reversible metal electrodeposition device (RMED) is a new type of electrochromic device, which has excellent spectrum regulation ability in visible and infrared regions, and has unique advantages such as simple structure, low energy consumption, multi-color state regulation. It shows great application potential in intelligent window, thermal management, information display and other fields. In recent years, the performance of RMED has been improved through structural design and electrolyte composition optimization, but there are still some problems such as poor open circuit stability, short cycle life and limited size, which seriously hinder the development and application of RMED. From the perspectives of spectral tuning range and performance optimization, the research progress of spectrum regulation devices based on reversible metal electrodeposition was summarized in this article. The spectral tuning range mainly includes visible and infrared bands. The current development status of RMED in the visible light region using different metal deposition systems was briefly introduced, which is also the most widely studied direction at present. The electrode innovation for achieving infrared spectral tuning was the focus of the discussion. The research methods for improving device performance such as open-circuit stability and cycling stability were discussed. Finally, it was pointed out that RMED still faces some development difficulties, and in the future, in-depth and systematic research can be carried out on device performance and theoretical mechanism, among other aspects.

  • LAI Liping, WANG Jun, CHONG Xiaoyu, LU Nan, ZHANG Zhibin, LIANG Xiubing, FENG Jing
    Journal of Materials Engineering. 2023, 51(7): 61-77.
    Thermal barrier coating (TBC) materials are an important method to provide thermal protection and prolong service life for aero-engines and gas turbines. In recent years,various kinds of high-entropy (HE) rare earth oxides have emerged in the exploration of novel thermal barrier coating materials, in order to obtain thermal, mechanical, high temperature phase stability, sintering corrosion resistance and other properties better than single principal rare earth oxides through HE effect on the thermodynamics and kinetics of hysteresis diffusion effect, the structure of the lattice distortion effect and "cocktail" effect on the performance. The thermal, mechanical and other performances of HE rare-earth zirconates,cerates,hafnates,phosphates,tantalates,niobates,etc. were summarized and analyzed in comparison with the performance of the corresponding single phases to investigate the various factors affecting the performance. Finally,it was pointed out that in the future, it may be possible to combine experiments with first-principles calculations to select high-entropy ceramic thermal barrier coating materials with superior comprehensive performance; at the same time, extending high-entropy to complex components or medium-entropy ceramic thermal barrier coating materials is also an important development direction.
  • Review
    Zhuo ZHANG, Xun MA, Ping LIU, Jingjing WANG, Hao ZHANG, Wei LI
    Journal of Materials Engineering. 2023, 51(9): 13-27.

    Implant infection is one of the most common and serious complications in orthopedics, and it is also an important reason for the failure of implant surgery. When bacteria form a biofilm on the implant surface, it is extremely difficult to be eliminated and attracts more bacteria and fungi. A large number of studies have shown that the use of surface modification technology can effectively reduce the adhesion and accumulation of pathogenic bacteria, thereby preventing peri-implant infection. The formation process of bacterial biofilm on the surface of orthopedic implants and the antibacterial mechanism of metal antibacterial agents were first analyzed. Then, some of the most widely used metal-based inorganic antibacterial coatings at home and abroad and their related preparation processes were reviewed, the problems and improvement methods in the application of these coatings were also discussed, and the development direction of inorganic antibacterial coatings in the future was prospected, such as synergistic antibacterial coatings and bone-promoting antibacterial coatings.

  • Research Article
    Zhe ZHAO, Qiang GAO, Cheng HAN, Yingde WANG
    Journal of Materials Engineering. 2023, 51(8): 102-109.

    The ZrC-SiC multiphase ceramic precursor of PZCS with abundant active cross-linking sites was prepared by a dehydrocoupling reaction between polyzrocarbonane (PZC) and polycarbosilane (PCS). The ceramization mechanism of PZCS and the composition and structure of the final ceramic were studied. The results reveal that the ceramic yield of PZCS (71.84%, mass fraction, the same below) is significantly higher than that of PZC (51.40%) or PCS (53.46%) precursor at 850 ℃, due to the promoted crosslinking of active groups during the ceramization process. Meanwhile, under the catalysis of Zr-Cp, the short-range carbon and Zr, Si elements are directly converted to carbide ceramics through the synergistic transformation of two polymers in PZCS, avoiding the adverse effects of carbon thermal reduction to the ceramics, and effectively reducing the sintering temperature. The ZrC-SiC nanocomposite ceramic with both high temperature resistance and oxidation resistance components is prepared after pyrolysis of PZCS. The generation of ZrC and SiC phases could inhibit crystallization and refine the grain size, of which the ZrC grain size is 25.4 nm. Moreover, the generation of ZrC-SiC nanocomposite structure would be beneficial for improving the comprehensive performance of ultra-high temperature ceramics.


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