Archive

  • 2004 Volume 0 Issue 12
    Published: 20 December 2004
      

  • Select all
    |
  • LI Jia-lu, WEI Li-mei, YANG Hong-na
    2004, 0(12): 3-7.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    LI Jia-lu, WEI Li-mei, YANG Hong-na. Influence of Structures of Carbon Fiber Three Dimensional Braiding Composites on Their Tensile and Bending Properties[J]. Journal of Materials Engineering, 2004, 0(12): 3-7.

    The tensile and bending properties of 4-step three-dimensional four-direction and five-direction braiding composites were studied. The influence of the structural parameter-braiding angle on their mechanical properties were discussed.The mechanical properties of three-dimension braiding composites were compared with that of laminated composites. The results showed that 3-D braiding composites had better mechanical properties than laminated composites. The tensile strength of three-dimension braiding composites reached 810MPa, the tensile modulus was 95.6GPa, the bending strength was 829.03MPa, and the bending modulus was 67.5GPa. The braiding angle and braiding structure had a great influence on their mechanical properties. The strength and modulus of tensile and bending decreased with increase of the braiding angles. The strength and modulus of tensile and bending properties of 3-D five-direction structures were higher than that of 3-D four-direction structure. The mechanical properties of 3-D braiding composites were determined by designing their braiding structure.
  • CAI Jian-ping, LIU Ming1, LUO Zhen-hua, ZHANG Xiao-yun, LU Feng, TAO Chun-hu, YAO Pei
    2004, 0(12): 8-11,15.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    CAI Jian-ping, LIU Ming1, LUO Zhen-hua, ZHANG Xiao-yun, LU Feng, TAO Chun-hu, YAO Pei. Study on Accelerated Tests for Atmospheric Corrosion of Aeronautical Aluminum Alloy[J]. Journal of Materials Engineering, 2004, 0(12): 8-11,15.

    The continuous salt spray, cyclic salt spray and comprehensive environmental test simulating atmospheric corrosion of LC4CS aeronautical aluminum alloy were studied using electrochemical and Scanning Electron Microscopy (SEM) techniques. Simulation and acceleration of these accelerated tests were discussed by comparison of outdoor and indoor tests.The results showed that the comprehensive environmental test simulated dry/wet and electrochemical characteristics of outdoor test. Meanwhile, comprehensive environmental test also had similar corrosion morphology and corrosion kinetics to those in outdoor tests; the comprehensive environmental test was a more accurate accelerated test for atmospheric corrosion of aeronautical aluminum alloy.
  • WANG Ji-gang, GUO Quan-gui, LIU Lang, BAI Shi-hong, QIAO Sheng-ru
    2004, 0(12): 12-15.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    WANG Ji-gang, GUO Quan-gui, LIU Lang, BAI Shi-hong, QIAO Sheng-ru. High Temperature Bonding Properties of Modified Phenol-formaldehyde Resin Matrix Adhesive[J]. Journal of Materials Engineering, 2004, 0(12): 12-15.

    The high temperature adhesive was prepared using phenol-formaldehyde resin as matrix and boron carbide as additives. Carbon materials were bonded by the above adhesive and thermally cured at 200℃ previously. Subsequently, the bonded specimens were heat-treated at 1200℃ in Muffle furnace. The high temperature bonding properties was tested at 1000℃, 1400℃ and 1800℃ respectively. The results showed that the modified phenol-formaldehyde resin exhibited satisfactory high temperature bonding properties. With the elevated testing temperatures, the bonding strength of bonded specimens was also increased. When the testing temperature reached 1800℃, the bonding strength was 5.22MPa. The change of structure and morphology of modification component had great effect on the high temperature bonding properties of phenol-formaldehyde resin. The properly production of B2O3 benefited in the formation of chemical bonding force at bonding interface and resulted in the increase of adhesive ability. But B2O3 would melt and converted into glass phase at high temperature environments and resulted in the extending of failure force quickly and decreasing of high temperature bonding properties. With the elevated high temperatures, the content of B2O3 was reduced, so the high temperature joining strength was increased gradually.
  • GUO Shao-qing, YUAN Hong, GU Wei-hua, LI Yan, CUI Yan, LI Xiao-hong
    2004, 0(12): 16-20,24.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    GUO Shao-qing, YUAN Hong, GU Wei-hua, LI Yan, CUI Yan, LI Xiao-hong. Investigation on Electron Beam Welding of ZL101A/SiCP/20p[J]. Journal of Materials Engineering, 2004, 0(12): 16-20,24.

    Electron beam welding of SiC particle reinforced aluminum matrix composites ZL101A/SiCP/20p was investigated.The results showed that direct welding without an insert between parts to be welded yielded cutting instead of welding,and ideal weld was achieved by using a Si-rich non-reinforced insert that melts side parent metal indirectly by its own melting. In order to obtain good weld, insert thickness, welding speed, current and focus mode should be carefully chosen. In this process porosity was serious, and pores appeared mainly in the partially melted zone. Rapid welding suppressed porosity to some extent.
  • LI Xiao-lei, QU Yuan-fang, MA Wei-bing , ZHENG Zhan-shen
    2004, 0(12): 21-24.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    LI Xiao-lei, QU Yuan-fang, MA Wei-bing , ZHENG Zhan-shen. Microstructure and Reoxidation Effect of Ni/PTCR Ceramic Composite[J]. Journal of Materials Engineering, 2004, 0(12): 21-24.

    In order to decrease room temperature resistivity the BaTiO3 based PTCR ceramics.The Ni/PTCR ceramic composites were synthesized by decompound of oxalate nickel, which was precipitated into BaTiO3-based PTCR ceramic slurry. Effects of heat treatment and microstructure on the electrical properties of the composites were investigated. The results indicated that heat treatment obviously resumed the PTCR effect, and the microstructure had decisive influence on the effects of heat treatment. Under some given compositions and heat treatment techniques, the composites had a low room temperature resistivity and obvious PTCR effect.
  • ZHENG Chun-man, LI Xiao-dong, YU Yu-xi, CAO Feng
    2004, 0(12): 25-28.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    ZHENG Chun-man, LI Xiao-dong, YU Yu-xi, CAO Feng. Preparation of High Temperature Resistance Si-Al-C-O Fibers by Polymer-derived Method[J]. Journal of Materials Engineering, 2004, 0(12): 25-28.

    In order to prepare high temperature resistance Si-Al-C-O (KD-A) fibers, polyalu- minocarbosilane (PACS) was synthesized by reaction of polysilocarbonsilane (PSCS) with Al(AcAc)3, (AcAc:aletylacetanate) at normal pressure. KD-A fibers with high temperature resistance was obtained by melting spinning of PACS, air curing, pyrolysis at 1300℃. The mass gain, Si-H reaction, gel content of PACS during curing process and the effect of mass gain on properties of KD-A fibers were investigated. The composition and structure of KD-A fibers was examined by measurements of SEM, AES and element analysis. The results showed that the Si-H bond in the molecular structure of PACS reacted with oxygen during the curing process and Si-O-Si bond was created. The empirical formula of KD-A fibers was SiC1.51O0.31Al0.013,and the high temperature resistant property of KD-A fibers was excellent.
  • ZHANG Chang-song, GAO Feng, YANG Zu-pei, TIAN Chang-sheng
    2004, 0(12): 29-31,35.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    ZHANG Chang-song, GAO Feng, YANG Zu-pei, TIAN Chang-sheng. Investigation of Bi4Ti3O12 Powder Prepared by Molten Salt Method[J]. Journal of Materials Engineering, 2004, 0(12): 29-31,35.

    Plated-like Bi4Ti3O12 powder with anisotropy was prepared by NaCl-KCl molten salt method. The effect of salt quantities and calcined temperature on microstructure and morphology of Bi4Ti3O12 powder was investigated. The results showed that pure perovskite structure of Bi4Ti3O12 powder was prepared at 750℃, the Bi4Ti3O12 particle size and the level of anisotropy increased with the increasing molten salt quantities and temperature. The best calcined temperature of plated-like Bi4Ti3O12 powder with anisotropy was 950~1000℃.
  • HUANG Xiao-xiao, WEN Guang-wu, CHENG Xian-ming
    2004, 0(12): 32-35.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    HUANG Xiao-xiao, WEN Guang-wu, CHENG Xian-ming. Oxidation Resistance and Mechanical Properties of Al4SiC4 Ceramic at High Temperature[J]. Journal of Materials Engineering, 2004, 0(12): 32-35.

    The oxidation resistance and mechanical properties of Al4SiC4 ceramics at high temperature were investigated. The results showed that Al4SiC4 ceramic had the excellent oxidation resistance, and the kinetics of oxidation obeyed the parabolic law from 1000℃ to 1600℃. The oxide scales consisted of the outer oxide layer with the higher density, the inner oxide layer (intermediate layer) with a few of large size pores,and the reaction layer with a number of small size pores. The high-temperature bending strength of Al4SiC4 ceramics showed an increasing trend from 1000℃ to 1300℃.The bending strength at 1300℃ (449.73MPa) was about 1.5 times of that at room temperature (297.1MPa).
  • CHEN Yong-gang, XU Ya-hong, YI Xiao-su
    2004, 0(12): 36-39.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    CHEN Yong-gang, XU Ya-hong, YI Xiao-su. Influence of Trigger Mechanism on Axial Crashing Behavior of Carbon/Epoxy Circular Tubes[J]. Journal of Materials Engineering, 2004, 0(12): 36-39.

    The effects of trigger geometry on axially crashing behavior of carbon/ epoxy composite circular tubes were investigated.The results showed that in axial crushing experiments, among 15°,45°,60° of the trigger geometry, 60° got the highest crashing peak load and the lowest crashing minimum load.The morphology analysis on the crushed tubes showed that the different trigger geometry led to different crashing microstructures failure for the reason on different contact conditions during crashing processing of the circular tube. As a result, the energy absorbing characteristic was deeply influenced by the trigger geometry.
  • WANG Song, CHEN Zhao-hui, SUO Xiang-bo, ZHENG Wen-wei
    2004, 0(12): 40-42,46.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    WANG Song, CHEN Zhao-hui, SUO Xiang-bo, ZHENG Wen-wei. Effect of Heat Treatment of T300 Carbon Fiber on Properties of Cf/SiC Composites[J]. Journal of Materials Engineering, 2004, 0(12): 40-42,46.

    Three-dimensional braided T300 carbon fiber reinforced silicon carbide (3D Cf/SiC) composites were fabricated viapolycarbosilane (PCS) precursor infiltration and pyrolysis processing. The effect of heat-treated T300 carbon fiber on properties of Cf/SiC composites was investigated. The results showed that heat treatment of carbon fiber weakened the fiber-matrix adhesion, decreased the damage of carbon fiber in composites and improved the mechanical properties of Cf/SiC composites obviously. The flexural strength and fracture toughness of Cf/SiC composites were 437MPa and 20.4 MPa·m1/2 respectively with carbon fiber heat-treated, contrasting to 154MPa,4.8MPa·m1/2 with carbon fiber as received.
  • CHEN Su-jing, YUAN Qing-ming, HE Jian-ping, ZHOU Jian-hua
    2004, 0(12): 43-46.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    CHEN Su-jing, YUAN Qing-ming, HE Jian-ping, ZHOU Jian-hua. Experimental Evaluation of Computing Method of Instantaneous Corrosion Rate for 7075 Aluminum Alloy[J]. Journal of Materials Engineering, 2004, 0(12): 43-46.

    Based on the relationship between cross section variety and resistance of sample, a new formula was put forward to calculate the instantaneous corrosion rate of aluminum alloy.Ohm resistance of 7075 aluminum alloy was measured while alloy was immersed entirely or half in corrosion electrolyte, then corrosion rate of the alloy was calculated with the new formula. The results showed that corrosion rate of 7075 aluminum alloy in electrolyte linearly decreased before 6h,got to a flat region,and little increased after 25h. These three periods corresponded to pitting, intergranular corrosion and exfoliation of sample. Corrosion rate of aluminum alloy half-immersed in electrolyte with time was similar with that of sample immersed entirely in electrolyte.
  • ZHAI Chang-sheng, WU Rui-zhi, WANG Hai-jun, ZHOU Shi-kui, SUN Bao-de
    2004, 0(12): 47-50,55.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    ZHAI Chang-sheng, WU Rui-zhi, WANG Hai-jun, ZHOU Shi-kui, SUN Bao-de. Properties of Al2O3 Coatings by HEPJet Plasma Spray Method[J]. Journal of Materials Engineering, 2004, 0(12): 47-50,55.

    The jet property of high efficiency plasma jet (HEPJet) system,and the characteristics such as bond strength, Vickers hardness, porosity and microstructure of the Al2O3 coatings prepared by this system were studied.Comparison of Al2O3 coatings was made between conventional plasma spray system and HEPJet system. The results showed that the characteristics of the Al2O3 coatings prepared by the HEPJet system were superior to those sprayed by the latter system.
  • LI Chang-jiu, SUN Bo, HAN Feng, WANG Min
    2004, 0(12): 51-55.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    LI Chang-jiu, SUN Bo, HAN Feng, WANG Min. Characteristics of Microplasma Spraying of Al2O3 Ceramic Coatings[J]. Journal of Materials Engineering, 2004, 0(12): 51-55.

    Al2O3 coating was deposited by microplasma spraying system through axial powder injection at a low power level about 2kW. The effects of plasma arc power, operating gas flow and spray distance on particle velocity during spraying, the microstructure and properties of the coatings were investigated. The coating microstructure was examined by optical microscopy, and the coating phase structure was examined by X-ray diffraction analysis. The coating property was characterized by abrasive wear loss. The particle velocity in flight was measured by the particle velocity/temperature measurement system based on thermal radiation.The results showed that the particle velocity was influenced significantly by plasma arc power, operating gas flow and spray distance. The velocity increased with increase of plasma arc power and operating gas flow, decreased with increase of spray distance. On the other hand, the abrasive wear loss of the coatings decreased with the increasing in arc power, and increased with increase of operating gas flow and spray distance. The abrasive wear loss of the coatings was significantly influenced by particle temperature. The abrasive wear loss of the Al2O3 coating deposited by microplasma spraying was comparable to that of the coating deposited by conventional plasma spraying system at 38kW.
  • YONG Zhi-hua, WANG Shi-yuan, LI Juan, LIANG Ya-ting, ZHU Shi-fu, ZHAO Bei-jun
    2004, 0(12): 56-58.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    YONG Zhi-hua, WANG Shi-yuan, LI Juan, LIANG Ya-ting, ZHU Shi-fu, ZHAO Bei-jun. Influence of Nanometer Ni Powder on Properties of WC-8Ni Cemented Carbide[J]. Journal of Materials Engineering, 2004, 0(12): 56-58.

    The binder of WC-8Ni cemented carbide was partly substituted by the nanometer Ni powder. Samples of cemented carbide were made by means of traditional technology, and their physics and mechanical properties were tested. The influences of nanometer Ni powder content and sintering temperatures on the physical and mechanical properties of the alloys were studied. The results indicated that the properties of alloys were greatly increased under certain proportions of nanometer Ni powder and sintering temperatures.
  • HU Zhi-biao, LI He-jun, CHEN Qiang, LI Ke-zhi, HUANG Li-hai
    2004, 0(12): 59-62.
    PDF ( ) Cite this article   Knowledge map   Save
    X

    HU Zhi-biao, LI He-jun, CHEN Qiang, LI Ke-zhi, HUANG Li-hai. Advance in Research on Tribological Behavior and Mechanism of Carbon/Carbon Composites[J]. Journal of Materials Engineering, 2004, 0(12): 59-62.

    Due to its excellent tribological properties, carbon/carbon composites were employed as aircraft brake material. Its tribological behavior was dramatically affected by both the tribotesting environment and the techniques used for the preparation of carbon/carbon composites. The factors affecting the tribological properties of carbon/carbon were discussed. The mechanisms of friction and wear were reviewed. The existing problem and the future research direction also were pointed out.
Submission

Founded in 1956 (monthly)

ISSN 1001-4381

CN 11-1800/TB

Sponsored by

AECC Beijing Institute of Aeronautical Materials

Hot Special Issues

Topic