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2004 Vol. 30, No. 10

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Diagnosis methods and criterions for mechanical failure modes, causes and mechanisms
Zhong Qunpeng, Song Guangxiong, Zhang Zheng, Luo Hon
2004, 30(10): 913-918.
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Mechanical failure modes, causes and mechanisms were described, based on four kinds of failure information including fracture, cracking, related failure marks and certain parameters. Mechanical failure modes, causes, main causing conditions and identifying principles were summarized and listed, "mul...
Failure process of thermal barrier coatings under thermal and mechanical loading
Xu Huibin, Gong Shengkai, Chen Liqiang, Zhang Chunxia
2004, 30(10): 919-924.
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High temperature behaviors of thermal barrier coatings prepared by electron beam physical vapor deposition were investigated under mechanical loading. The change in microstructure and the formation of microcrack were studied by means of impedance spectroscopy (IS) and acoustic emission (AE) methods....
Formation and mechanical properties of Cu-Zr-Ti bulk glassy alloys
Zhang Tao, Men Hua, Ti Yunjie
2004, 30(10): 925-929.
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Cu-base bulk glassy alloys with high glass-forming ability were fabricated in Cu-Zr-Ti ternary system by copper mold casting. The critical diameter for glass formation was 5 mm for Cu60Zr40-xTix(x=7.5%, 10%, 12.5%) alloys, 4 mm for Cu60Zr25Ti15 alloy and 3 mm for Cu60Zr40-xTix(x=15%, 17.5%, 22.5%, 2...
Analysis of the residual thermal stresses of SiC joint with Ti/Ag/Ti interlayer by FEM
Mao Yangwu, Zhang Jianjun, Li Shujie
2004, 30(10): 930-933.
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With regard to the joining of ceramic to ceramic using metallic interlayers or the joining of ceramic to metal, the mismatch of thermal expansion coefficient between the ceramic and the metallic materials generates residual thermal stresses during joining and cooling. The stresses may cause microcra...
Factors effecting on the wicking of epoxy resin in capillaries of unidirectional fibre bundles
Zhang Zuoguang, Li Min, Sun Zhijie, Chen Liang
2004, 30(10): 934-938.
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Understanding the wetting behavior of resin in fiber assemblies is critical for predicting and improving the fabrication performance of composites. According to capillary rise method, the wicking flow in unidirectional fiber bundles was characterized through measuring the mass gain in fibers at diff...
Array materials of one-dimensional oxides prepared by MOCVD method
Zhang Yue, Yuan Hongtao, Cheng Jin, Song Qiang
2004, 30(10): 939-943.
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The structure and the new features of a new-type atmospheric metal organic chemical vapor deposition (MOCVD) system were introduced. The atmospheric MOCVD method was introduced to prepare array materials of oxides by the example of preparing array material of ZnO nanorods. The preparing process of o...
Improvement of soft magnetic properties of FeCo core alloy by vacuum and field annealing
Bi Xiaofang, Zhang Shanqing, Zhu Fangzhen, Xu Huibin
2004, 30(10): 944-948.
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Microstructures and soft magnetic properties of FeCo alloy were investigated in an attempt to improve its soft magnetic properties. Microstructural dependence of the magnetic properties was studied by vacuum annealing at various temperatures. Magnetic field annealing was performed to study the depen...
Effect of thermal treatment on thermal diffusivity of nanostructured zirconia coating
Zhou Chungen, Wang Na, Gong Shengkai, Xu Huibin
2004, 30(10): 949-952.
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Yttria partially stabilized nanostructured zirconia coatings were prepared by atmospheric plasma spraying (APS). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to analyze the nanostructured coatings and that after heat-treatment. Thermal conductivity were also measured b...
High-temperature relaxation of TiNiFe shape memory alloy
Liu Fushun, Han Dong, Zheng Lei, Xu Huibin
2004, 30(10): 953-957.
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Abstract:
For the shape memory alloy pipe connector, the stress relaxation’s stability has more influence on the pipe connector in the working environment. So the particular study on the stress relaxation’s stability of the aero shape memory alloy pipe connectors in the working environment has vital practical...
Effect of Cr on ZrO2/Ni thermal barrier coatings interface cohesion
Shang Jiaxiang, Wang Fuhe, Xu Huibin
2004, 30(10): 958-961.
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The thermal barrier coatings (TBC) are widely used in aeronautics and astronautics industry. The cohesion between the coatings and substrate is a vital effect in determining the TBC lifetime. The interface cohesion must strong enough in order to have longer lifetime. Based on density functional theo...
Rapid solidification laser processing and forming of advanced aeronautical metallic materials
Wang Huaming, Zhang Lingyun, Li An, Cai Lianxu, Tang Haibo
2004, 30(10): 962-967.
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Abstract:
Research progress on rapid solidification laser surface modifications of advanced metallic materials, rapid solidification laser cladding for high-temperature wear and corrosion resistant multifunctional intermetallic coatings, and rapid solidification laser additive manufacturing for high performan...
Magnetostrictive properties and AC electrical properties of activated carbon black filled polypropylene composites
Zhan Maosheng, Ding Naixiu
2004, 30(10): 968-971.
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Carbon black was activated and then filled into polypropylene to prepare composites, of which the alternating current (AC) electrical properties and the magnetostrictive properties were measured. It is shown that there are both conductive properties and magnetostrictive properties in the composites....
Effects of Zr addition on structure and properties of Mg-Zr alloy
Kong Zhigang, Liu Hongbo, Zhang Hu
2004, 30(10): 972-975.
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Abstract:
Grain refining mechanisms of magnesium-zirconium alloys were investigated. Mg-Zr alloys were prepared and a mixture gas containing SF6 was used for protection during melting and casting. The microstructure and properties of Mg-Zr alloys and the effects of strain, frequency, temperature as well as th...
Microstructures and properties of a Mg-Li-Al-Zn wrought alloy
Chen Bin, Feng Linping, Zhong Hao, Zhou Tietao, Liu Peiying
2004, 30(10): 976-979.
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Abstract:
A novel β base Mg-Li-Al-Zn wrought alloy was designed according as the Mg-Li binary phase diagram and effect of Al, Zn on the alloys. The microstructure and alloy phases changes of the alloy on the states of casting, forging, rolling and rolling-annealing were systematically investigated by optical ...
Self-reaction in-situ synthesis of TiC/FeNiCr composite coating in centrifugal field
Xi Wenjun, Zhu Weili, Duan Huiping, Zhang Tao
2004, 30(10): 980-983.
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Abstract:
A TiC-FeNiCr composite materials coating on the substrate of a low carbon steel was successfully prepared using centrifugal-thermit process with raw materials Fe2O3, CrO3, NiO, Al, Ti and C powders. The microstructure of the coating were investigated using scanning electron microscope (SEM) and X-ra...
Transient liquid phase bonding of TiAl and Inconel 718
Duan Huiping, Luo Jun, Zhang Tao, Mustafa Kocak
2004, 30(10): 984-988.
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Ti foil combined with Cu or Ni foils was used as insert metals to join TiAl intermetallic and Inconel 718 employing transient liquid phase (TLP) bonding technique. The effect of dwell time at bonding temperature on the interfacial structures of the joints was investigated. Results showed that defect...
Effect of ball blasting on the service properties of NiCoCrAlY coating of the alloy IC6 vane
Li Shusuo, Zhou Chungen, Gong Shengkai, Song Jinxia, Han Yafang
2004, 30(10): 989-992.
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Abstract:
NiCoCrAlY overlay coating was deposited on the vane made of alloy IC6 by arc physics vapour deposit(PVD). In order to improve the surface roughness of the vane, a ball blasting treatment was operated. It shows that the surface roughness obviously got improved, the original average value of the rough...
Manufacturing of GF/PP warp-knitting fabrics reinforced polypropylene composite materials
Duan Yuexin, Zuo Lu, Zhang Yadong, Liang Zhiyong
2004, 30(10): 993-997.
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Continuous glass fiber reinforced polypropylene (GF/PP) composite material were manufactured with a new kind of warp-knitting fabrics in two different forms by thermoforming. The microstructure of impregnation quality of the composite material was observed with the scanning electronic microscope (SE...
Electrochemical characteristics of titanium alloy in engine oil and NaCl solution
Liu Jianhua, Shang Haibo, Wu Hao, Li Songmei
2004, 30(10): 998-1002.
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The electrochemical characteristics of a new titanium alloy Ti-6Al-1.5Cr-2Zr in 3# kerosene and 928 lubricating oil with high resistance were studied by using potentiodynamic polarization. The electrochemical properties including the laws of polarization, open-circuit potential, linear polarization ...
High temperature oxidation resistance of nickel multiple plating containing SiO2,ZrO2 particles
Du Yanbin, Zhu Liqun, Liu Huicong, Bai Zhenquan
2004, 30(10): 1003-1007.
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Nickel multiple plating containing 11.3％(atoms％)SiO2 or 5.31％(atoms％)ZrO2 particles on copper alloy base was obtained by composite electrodeposition method. Through high-temperature oxidation and thermal cycling test at 800℃ and 900℃, the high-temperature oxidation performance of samples prepared pr...
Preferred orientation of electrolytic copper foil
Zhang Shichao, Jiang Tao, Bai Zhiming
2004, 30(10): 1008-1012.
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Preferred orientation of copper foil which was electrodeposited under different conditions in electrolyte solution containing thioureas,glue additives was studied by X-ray diffraction(XRD), all-purpose material testing machine．The results showed that the copper foil which was electrodeposited in ele...
Effect of sulfate-reduced bacteria on corrosion and electrochemical behaviors of LY6 Al alloy
Li Songmei, Liu Jianhua, Liang Xin, Jia Xiaoli
2004, 30(10): 1013-1016.
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The open circuit potential, potentiodynamic scanning polarization and electrochemical impedance spectroscopy (EIS) were employed to analyze the corrosion behaviors of LY6 Al alloy in solutions with and without sulfate reduced bacteria(SRB).It was showed that SRB accelerated the corrosion rate of LY6...
Influence of salt spray corrosion on the performance of NiCoCrAlY coatings
Xiang Min, Zhang Qi, Luo Junhua
2004, 30(10): 1017-1020.
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The NiCoCrAlY coatings prepared by electron beam physical vapor deposition (EB-PVD) was studied by a salt-spray-test. The influence of salt spray corrosion on the microstructure and high-temperature cyclic oxidation behavior of NiCoCrAlY coating was investigated. Results show that the alumina formed...
Self-assembly structure of CeO2 nanoparticles: synthesis, characterization and catalytic property
Zhang Yahui, Qi Xingyi, Guo Lin, Zhang Qi
2004, 30(10): 1021-1024.
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A new approach to synthesis of self-assembly CeO2 nanoparticles by using microemulsion method was investigated. The structure of the product was characterized by the methods of X-ray diffraction (XRD), transmission electron microscopy (TEM), and extended X-ray absorption fine structure (EXAFS). XRD ...
Catalytic removal of nitrogen oxides for the lean-burn automobile exhaust
Zhu Tianle, Hao Jiming, Fu Lixin, Li Junhua
2004, 30(10): 1025-1028.
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Al2O3, Ag/Al2O3, Sn/Al2O3, Ga/Al2O3, Co/Al2O3 and Pt/Al2O3 catalysts were prepared by the sol-gel mixture method and the activities of NO reduction by C3H6 over the catalysts were compared in the presence of oxygen. The Ag/Al2O3 displayed the highest NO reduction activity among catalysts studied. Th...

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