Superalloy hollow turbine blades are key components of aero engines, and the ceramic core used for forming the complex cooling channel structure inside the blade is a key transitional component in the blade preparation. The light-curing additive manufacturing process for ceramic cores has the advantages of no need for molds, high precision and short process cycle, providing a reliable new process for the high-precision preparation of complex-structured ceramic cores. Among them, defect control in the additive manufacturing process of cores has become the key to the preparation of high-precision ceramic cores. This work summarizes the current research status of printing, degreasing and sintering defect control at home and abroad. The defect regulation mechanism was summarized, and the research status of defect regulation was reviewed from aspects such as slurry preparation, printing and degreasing - sintering process optimization, and the addition of mineralizers. The stereolithographic additive manufacturing ceramic technology provides theoretical guidance for the preparation of high-performance light-curing additive complex structure ceramic cores.

Solid oxide fuel cell (SOFC) is a green and efficient electrochemical energy conversion device. Due to the use of solid ceramics as electrolyte materials, it needs to work in a high temperature environment of 600-1000℃. The high temperature environment can accelerate the aging of equipment materials, resulting in the rapid decline of battery performance. Intermediate and low temperature SOFC technology can improve the startup speed of the system, improve the durability of the equipment, and expand the scope of equipment selection. Therefore, the development of intermediate and low-temperature SOFC technology is crucial to achieve its commercial application. Since charge transfer and oxygen exchange reactions in solid electrolytes are thermal activation processes, the decrease of SOFC operating temperature can increase the ohmic polarization of the electrolyte and increase the polarization loss of the electrode, which can affect the actual power of SOFC. In recent years, the research of SOFC technology at intermediate and low temperature has mainly focused on optimizing the microstructure and chemical composition of electrodes and electrolyte materials. In this work, the research progress on the SOFC key materials for electrode and electrolyte to intermediate and low temperature is systematically summarized, and the future design and development direction of SOFC key materials are prospected.

The application of TA3 alloy in the aerospace field is mainly through welding and the microstructure and mechanical properties of its welded joints have a significant impact on the service safety of welded components. This study compared the tensile properties of the base metal and weld specimens, and studied the deformation morphology before and after tension using the scanning electron microscopy combined with electron backscatter diffraction. The results show that, unlike the equiaxed α grains in the base metal area, massive, acicular and serrated α grains are formed in the weld area. Tensile experiments show that, as a result of the hardness is significantly higher than the base area of weld area, result in welded joint fracture is located in the base area. The deformation mechanism of the weld zone is deformation twin (0112 ̅)[0111 ̅]、and(11 ̅02)[11 ̅01]. The deformation mechanism of the base metal zone is deformation twin (11 ̅02)[11 ̅01] and dislocation slip.

Facing the development demand of clean and efficient utilization of coal in the future, the development of C700R-1 alloy rotor forgings with a diameter of Ø850mm for advanced ultra-supercritical steam turbine rotor was carried out. We successfully manufactured the rotor forging by closed upsetting + extrusion method. The grain size of the forged forging was NO. 4-7, which became about NO. 3 after heat treatment. Due to the rapid cooling rate of the edge parts after solid solution, a large number of uniform and fine γ' phases could be precipitated in the subsequent aging process. Therefore, the tensile properties of edge position were slightly better than those of the heart and 1/2R position. The variation of tensile properties in different directions of edge position was small. The room temperature tensile strength could reach 950MPa, the yield strength could reach 600MPa, and the impact energy was beyond 70J at different positions after heat treatment. The tensile strength could reach 750MPa, yield strength could reach 500MPa at 700℃.The plasticity was higher than 25% at room temperature and 700℃. The creep life exceeded 7000h in the condition of 700℃/300MPa. We realized the homogeneous manufacture of large section nickel base alloy forging with diameter of Ø850mm. Through the deformation mode of closed upsetting+ extrusion and reasonable heat treatment process, we have realized the homogenization manufacturing of nickel base alloy forgings with a section grade of Ø850mm, which provides key data for the subsequent manufacturing of full-size nickel base alloy rotor forgings.

Environmental barrier coatings (EBCs) are a key protective technology for the ceramic matrix composites (CMCs) hot end components of high-performance aircraft engine, which can significantly improve the service stability and reliability of the components. In this paper, Si/Yb2Si2O7/Yb2SiO5 tri-layer structural EBCs are prepared by air plasma spray (APS) and their corrosion behavior and degradation mechanism under 1350 ℃ and cycling water vapor conditions are investigated. The results show that the as-annealed coating is mainly composed of monoclinic Yb2SiO5 phase and cubic Yb2O3 phase, with nano-sized Yb2O3 phase disperses in Yb2SiO5. The surface of Yb2SiO5 coating exhibits a ridge-like structure accompanied by a certain number of pores after cyclic water vapor corrosion, and the content of corrosion products Yb2Si2O7 increases with the number of cycles. The formation of Yb2Si2O7 is related to the alternating wet to dry corrosive environment and the gaseous substance Si(OH)4. Penetrating cracks exists within the Yb2SiO5 coating but terminates at the Yb2SiO5/Yb2Si2O7 interface, and the SiO2 film generated from the oxidation of the Si bond coat is well bonded to the Yb2Si2O7 interlayer and the Si bond coat in general. The tri-layer EBCs system in this paper exhibits excellent resistance to cyclic water vapor corrosion at 1350 ℃.

A new type of Ni-20W-20Cr heterogeneous seed with low melting point, low segregation, and cellular branching characteristics was designed by Pandat thermodynamic software combined with high-throughput experimental method using Ni-20W binary alloy as the base alloy. DSC results showed that the temperature of the solid and liquid line for Ni-20W-20Cr heterogeneous seed were 1399.7 ℃ and 1419.1 ℃, respectively. Compared with the traditional seed, it existed a narrow solidification interval as 19.4 ℃. In addition, the primary spacing of the Ni-20W-20Cr heterogeneous seed during the growth was also calculated. The results showed that the primary spacing had experienced a first increasing and then decreasing process, which was in good agreement with the KF model (111±8.37μm→116±4.77μm→125±6.41μm→105±3.65μm). After that, based on the interface instability model, the transition rate for the flat interfacial instability and the cellular branching were calculated. The results showed that the flat interfacial instability transition rate in the experiment matched the model well, but the cellular branching transition rate in the experiment was higher than that in the model, which indicated that the traditional primary spacing model might not be suitable for the step incremental speed experiment. At the same time, the EDS results showed that the Cr elements were mainly concentrated on the inter-dendrites, and W elements were enriched in the dendritic stem, while Ni element was basically even distributed. At last, Ni-20W-20Cr heterogeneous seed with a cellular-dendritic structure was prepared. And it was proved that the Ni-20W-20Cr heterogeneous seed could be re-used during the preparing of the single crystal blades.

Nanomaterials with combined photothermal-chemodynamic therapy (PTT-CDT) offer significant advantages in cancer treatment, yet designing and fabricating such multifunctional nanomaterials remains challenging. In this study, cuttlefish ink (M) was used as a core, onto which a layer of CuO was grown, successfully constructing the M@CuO composite multifunctional nanomaterial. The M@CuO exhibited a spherical shape with a nanoparticle size of 128.2 nm and demonstrated excellent photothermal conversion efficiency (ηT = 47.6%) under near-infrared (NIR) light irradiation. Additionally, the M@CuO showed a strong Fenton effect at room temperature (25°C), and the Fenton reaction rate could be further enhanced by the photothermal effect, with the reaction rate at 45°C being 2.3 times that at 25°C under the same conditions.In vitro cell experiments reveal that M@CuO had good biocompatibility and could effectively kill tumor cells through combined PTT-CDT. Therefore, M@CuO provided an effective strategy for developing multifunctional nanomaterials with PTT-CDT synergistic therapy.

This paper aims to compare the changes in residual flexural strength after surface damage in chemically strengthened lithium aluminosilicate glass and chemically strengthened aluminosilicate glass. The single-particle sandblasting damage and multi-particle sandblasting damage of chemically strengthened lithium aluminosilicate glass and chemically strengthened aluminosilicate glass were prefabricated by a self-made sandblasting tester at different pressures. The bending strength before sandblasting and residual flexural strength after sandblasting damage were tested. The results show that the depth of compressive stress layer of chemically strengthened lithium aluminosilicate glass is significantly greater than that of chemically strengthened aluminosilicate glass. The compressive stress of aluminosilicate glass and lithium aluminosilicate glass after chemical strengthening varies differently along the thickness direction. The compressive stress of aluminosilicate glass is greater than that of lithium aluminosilicate glass within 40 μm depth range, while the compressive stress of lithium aluminosilicate glass is greater than that of aluminosilicate glass when the depth exceeds 40 μm. After sandblasting damage, the residual flexural strength of aluminosilicate glass is greater when the damage depth is within 40 μm depth range, while the residual flexural strength of lithium aluminosilicate glass is greater when the damage depth is further increased to more than 40 μm. Chemically strengthened lithium aluminosilicate glass has a greater advantage in residual flexrual strength after surface damage compared to aluminosilicate glass.

In order to study the impact of the microstructure and electrochemical behavior of the high-energy ball mill on the β-MNO₂ samples, XRD, SEM, Lidar size analyzer, TEM test and analyze the structure, particle appearance and size, and crystal structure of the sample; The electrochemical performance, electrochemical impedance spectrum and CV curve of the battery tester and electrochemical workstation are used to test the battery. The results show that compared with the sample before the ball grind, the crystal structure space group of the sample after the ball is changed, the grain size and particle size are reduced, and the microstructures that coexist in crystal and amorphous state. As the ball grinding time increases, the form of the sample particles is to be small-scattered-granular reunion and decentralization-granular reunion and plate transformation, and at the same time, the lattice distortion gradually becomes serious. The activation performance and discharge efficiency of the sample battery after the ball grind are good, but the maximum discharge capacity is related to the microstructure and particle form of the ball mill time. In different ball mills, the maximum discharge capacity of the 4.0h ball grinding sample battery is relatively high. After 100 charging and discharge cycle, the capacity maintenance rate of the 5.5h ball grinding sample battery is relatively good. According to dynamic studies, compared with other batteries, the charging impedance of the 4.0h ball grinding sample battery is relatively small, the WARBURG diffusion impedance is relatively small, and the peak area of the circulating ambush method is relatively large. The relatively high electrochemical capacity and the relatively small charging potential difference.

According to the maximum solid solubility of Zn, Mg, Cu in aluminum and their precipitation strengthening phases, Al-12Zn-2Mg-0.5Cu-0.3Sc (wt.%) high strength aluminum alloy was designed. The billet of this alloy was hot rolled followed by clod rolling and heat treatment, to explore the optimal heat treatment process for aluminum alloy with high solid solubility in order to obtain good tensile properties. Optical microscopy (OM), X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were used to observe and analyze the microstructure of the alloy under different heat treatment conditions, and universal tensile testing machine was used to test the tensile properties of the alloy at room temperature. The results show that after solution treatment at 470℃/1h, the microstructure of the cold-rolled alloy is incomplete recrystallized with elongated grains along the rolling direction. The tensile strength of the alloy is 599MPa, and the elongation reaches 15.4%, which shows that the alloy has good pre-aging properties. After aging treatment at 120℃/30h, good mechanical properties were obtained, and fine MgZn2and T(AlZnMgCu) strengthened phases are precipitated in the microstructure, which further improve the properties of the alloy. The corresponding tensile strength reaches 736MPa, and the elongation is 10.6%.

Fe-Mn-Al-Ni based shape memory alloys exhibit an extremely low temperature dependence of the critical stress of martensitic transformation and display great superelastic temperature ranges (-263 to 240 °C). Therefore, these shape memory alloys show promising applications in aerospace, space exploration, vibration damping, and other environments with variable working conditions. In this work, the main factors affecting the superelasticity of Fe-Mn-Al-Ni based shape memory alloys were reviewed and prospected. Since the precipitation of coherent B2 nano-phase plays the key role in the martensitic transformation from non-thermoelastic to thermoelastic in Fe-Mn-Al-Ni-based shape memory alloys. The mechanism by which the coherent B2 nano-phase modulates the martensitic transformation of Fe-Mn-Al-Ni-based shape memory alloys and the related progress of its size regulation were firstly discussed. Since the superelasticity of Fe-Mn-Al-Ni-based shape memory alloys is known to be positively correlated with the grain size, the preparation of single crystals is a prerequisite for achieving excellent superelasticity. Therefore, the single-crystal growth studies of Fe-Mn-Al-Ni-based shape memory alloys in recent years were reviewed. Then, the functional properties of single-crystal Fe-Mn-Al-Ni-based shape memory alloys were summarized. Finally, the future research and development of Fe-Mn-Al-Ni-based shape memory alloys were prospected.