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  • 2004 Volume 0 Issue 4
    Published: 20 April 2004
      

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  • GUI Zhen-duo, YANG Xian-jin, ZHU Sheng-li, H C Man
    2004, 0(4): 3-6,10.
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    GUI Zhen-duo, YANG Xian-jin, ZHU Sheng-li, H C Man. Microstructure and Surface Characteristics of the Laser Gas Nitrided Titanium[J]. Journal of Materials Engineering, 2004, 0(4): 3-6,10.

    A continuous wave Nd-YAG laser was used to perform laser gas nitriding on titanium. The microstructure, surface composition and structure were investigated by SEM, XRD and XPS. The results show that a relatively smooth and crack-free nitrided layer was obtained on titanium by laser gas nitriding. Metallurgical bonding between the nitrided layer and Ti substrate was observed. The outmost surface of the nitrided layer was found to be comprised of dendritic TiN, TiNxOy, TiO2 and TiC. Carbon and oxygen contamination were detected on the outmost surface of the sample. The intensity of the TiN dendrite in the nitrided layer decreased with increasing depth.
  • LI Hong-mei, CAI Xun, LÜ Zhan-peng, YANG Wu
    2004, 0(4): 7-10.
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    LI Hong-mei, CAI Xun, LÜ Zhan-peng, YANG Wu. Analysis of Surface Oxide Films on Stress Corrosion Cracking Specimens of Type 304 Stainless Steel in High Temperature Water Containing Boric Acid and Lithium Ion[J]. Journal of Materials Engineering, 2004, 0(4): 7-10.

    Stress corrosion cracking (SCC) of 304 stainless steel in high temperature water containing H3BO3 and Li+ was studied using slow stain rate test (SSRT). The results show that heat-treatment of the material, oxygen or/and chloride concentration in the water all affected the SCC susceptibility of this material. The surface oxide films changed relatively.
  • FAN Yao-feng, ZHANG Xing-xiang, WANG Xue-chen, NIU Jian-jin, CAI Li-hai
    2004, 0(4): 11-15,19.
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    FAN Yao-feng, ZHANG Xing-xiang, WANG Xue-chen, NIU Jian-jin, CAI Li-hai. Effect of Heat Treatment on Properties of Nanoencapsulated Phase Change Materials[J]. Journal of Materials Engineering, 2004, 0(4): 11-15,19.

    Nanoencapsulated phase change material (PCM) was prepared by in-situ polymerization with melamine-formaldehyde resin (M-F) shell. The core material was a mixture of n-octadecane and cyclohexane. The properties of the capsules were systematically studied through scanning electronic microscopy (SEM), differential scanning calorimeter (DSC), thermal gravimeter (TG) and infrared spectrometer (IR), etc. After they were heat-treated at different temperatures for 30-60 min. The results show that the average diameter of the capsule is approximately 0.75 micron being in the range of nanocapsule. Heat treatment has significant effect on the morphology, phase change property and thermal stability of nanocapsule. A free expansion space inside the capsule is formed after the cyclohexane in the core diffuses out of the shell by heat treatment, and the free expansion space will increase the thermal stability of nanocapsule. The nanocapsule with best thermal stability and enthalpy can be obtained by heat treatment at a temperature from 160℃ to 180℃ for 30 minutes to 60 minutes. The enthalpy of nanocapsule is about 150J/g, and the thermal stability is approximately 215℃.
  • LU Feng, ZHANG Xiao-yun, TANG Zhi-hui, ZHONG Qun-peng, CAO Chun-xiao
    2004, 0(4): 16-19.
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    LU Feng, ZHANG Xiao-yun, TANG Zhi-hui, ZHONG Qun-peng, CAO Chun-xiao. Study on the Corrosion Behavior of Graphite Epoxy Composite Materials[J]. Journal of Materials Engineering, 2004, 0(4): 16-19.

    Electrochemical test, weight loss and SEM morphology were used to study the corrosion behavior of graphite epoxy composite materials (GECM), electrochemical and immersion corrosion test were conducted in 3.5% NaCl solution. The corrosion behavior of GECM coupled with the LY12CZ aluminum alloy was also observed in immersion test. The results show that open-circuit potential of GECM was more positive because the slow diffusion rate of oxygen and could reach e-quilibrium potential until about 10h immersion. Absorption of corrosion media made the weight gain of GECM. The surface morphology of GECM did not changed greatly after 1464h immersion corrosion. The corrosion behavior of GECM was not affected basically by galvanic corrosion between LY12CZ aluminum alloy and GECM.
  • YU Jian-ying, WEI Lian-qi, CAO Xian-kun, CHEN Wen-yi
    2004, 0(4): 20-23.
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    YU Jian-ying, WEI Lian-qi, CAO Xian-kun, CHEN Wen-yi. Organized Vermiculite/Phenolic Resin Nanocomposites Prepared by Melt Intercalation[J]. Journal of Materials Engineering, 2004, 0(4): 20-23.

    The expanded-vermiculite was organically modified by hexadecyl trimethylammonium bromide (CTAB). The organized vermiculite/phenolic resin nanocomposites were prepared by melt intercalation. Structures and heat performance of the nanocomposites were investigated with XRD, AFM and TGA. The results show that the phenolic resin can be intercalated in original vermiculite and the galleries distance of the vermiculite is increased to about 20nm. The thermal degradation temperature of the nanocomposites is retarded from 445℃ to 506℃ as compared to the pure phenolic resin.
  • MA Qiang, ZHOU Feng, TIAN Qiu, TANG Ya-ping, LI Chen-sha, LU Wei-zhe, TIAN Feng
    2004, 0(4): 24-27.
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    MA Qiang, ZHOU Feng, TIAN Qiu, TANG Ya-ping, LI Chen-sha, LU Wei-zhe, TIAN Feng. Enhancing Antistatic Ability of Three Organic Antistatic Agent by Carbon Nanotubes[J]. Journal of Materials Engineering, 2004, 0(4): 24-27.

    Carbon nanotubes were used in modifying three organic antistatic agents. The friction charges were measured to exhibit the antistatic ability of polymer fibers. Organic antistatic filler grains:CNTs/PR86, CNTs/TS40 and CNTs/TS51, prepared by dispersing CNTs in organic antistatic carrier, was cospun with polymer to prepare composite antistatic fibers. It is indicate that CNTs further improved the antistatic ability of organic antistatic agents in PP fibers compared to pure organic agent.
  • CHEN Guo-min, CHEN Zhao-hui, JIAN Ke
    2004, 0(4): 28-30,36.
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    CHEN Guo-min, CHEN Zhao-hui, JIAN Ke. Development of New Versatile Phenol-starch Moulding Material (PF2A1)[J]. Journal of Materials Engineering, 2004, 0(4): 28-30,36.

    A new versatile phenol-starch material was developed. The mass percentage of the constituent was 37.0% phenol-starch resin, 6.4% hexamethylene-tetramine, 48.0% wood flour, 6.0% calcium carbonate, 0.6% magnesium oxide, 0.6% zinc stearate, 0.4% stearic acid, 0.5% oil aniline black, 0.5% ultramarine. During the preparation, the mixing time was longer than 60min;The temperature of the working roller was 85-95℃; The temperature of the idle roller was 145-155℃; The distance of the two rollers was 2.3-2.5mm; The warm-up time was 4-5min and the combining batch time was longer than 45min. When the materials were moulded, the preheating temperature was 100-110℃; The preheating time was 10-15℃; The moulding pressure was larger than 25MPa; The final moulding temperature was 175-180℃; The final moulding time was 0.8-1.0min/mm and the exhausting times were more than 3 times. The properties of the product meet the national standard of phenolic moulding material (PF2A1) . Compared with the phenol-formaldehyde moulding materials (PF2A1),the product has 20.4% less raw material cost and more competitive.
  • LI Wei, YANG Hai-bo, SHAN Ai-dang, WU Jian-sheng
    2004, 0(4): 31-33,48.
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    LI Wei, YANG Hai-bo, SHAN Ai-dang, WU Jian-sheng. Effect of Mo Addition on the Fracture Toughness of Nb/Nb5Si3 in situ Composites[J]. Journal of Materials Engineering, 2004, 0(4): 31-33,48.

    Nb/Nb5Si3 in situ composites were prepared by arc melting and heat-treated at 1200℃ for 100 hours. Single edge notched bending (SENB) test was preformed to study the fracture toughness of Nb-Si-Mo alloys. The result reveals that the room temperature fracture toughness of the Nb/ Nb5Si3 in situ composites are improved with Mo addition.
  • QIAO Sheng-ru, YANG Zhong-xue, HAN Dong, LI Mei
    2004, 0(4): 34-36.
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    QIAO Sheng-ru, YANG Zhong-xue, HAN Dong, LI Mei. Tensile Creep Damage and Creep Mechanism of 3D-C/SiC Composite[J]. Journal of Materials Engineering, 2004, 0(4): 34-36.

    Tensile creep properties of the 3D-C/SiC were examined in vacuum creep testing machine. After a period of the creep time, the specimen was taken out for observing specimen surface by SEM and measuring resonance frequency. The experimental results indicated that fiber tows slid, pores inter fiber bundles were deformed, on pores surface matrix micro-cracks more likely generated and angles of inter fiber tows were changed, the creep damage concentrated in cross points of fiber tows. These were special creep mechanism of 3D-C/SiC. Relative variable curves of electric resistance and modulus resemble to creep curve, so they can be used to evaluate the creep damage. The creep is caused by damage, and it can be explained by damage creep mechanism of 3D-C/SiC.
  • CHANG Yan-yan, ZHANG Zheng
    2004, 0(4): 37-39,45.
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    CHANG Yan-yan, ZHANG Zheng. Analysis between Corrosion Results and Environment Factors of the Full-immersion and the Tide Zone of LY12CZ in Xiamen Coast[J]. Journal of Materials Engineering, 2004, 0(4): 37-39,45.

    The method of grey relevancy was applied to analyze the effect of the ocean and atmosphere factors on general corrosion and pitting of the alloys LY12CZ in full-immersion and tide zone in Xiamen respectively, and the affecting sequence of factors is obtained. According to the failure mechanism discussion, the calculate results can be accepted. This method can be used to analyze corrosion data in complicated environments.
  • SONG Kai, TANG Ji-hong, ZHONG Wan-li, LIU Wei-cheng, REN Ji-lin
    2004, 0(4): 40-42,48.
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    SONG Kai, TANG Ji-hong, ZHONG Wan-li, LIU Wei-cheng, REN Ji-lin. Finite Element Analysis and Magnetic Memory Testing of Ferromagnetism Items[J]. Journal of Materials Engineering, 2004, 0(4): 40-42,48.

    Stress distribution of flat plate, which has a crack in center, was analyzed in terms of finite element method by ANSYS software. The results agreed with theoretical calculation of integration, and some regulations between stress concentration and magnetic memory effect are proved through measuring magnetic leakage field of flat plate. The applicability of magnetic memory testing in pre-diagnosis of ferromagnetism items was discussed.
  • XIE Shou-ming, GAO Hong-bo, ZHAO Jie, WANG Lai, HAN Shuang-qi
    2004, 0(4): 43-45.
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    XIE Shou-ming, GAO Hong-bo, ZHAO Jie, WANG Lai, HAN Shuang-qi. FES-DP System and Z Parameter Method to Evaluating Residual Life of Cr5Mo Steel[J]. Journal of Materials Engineering, 2004, 0(4): 43-45.

    Pearlite heat resistant steels are widely used as high temperature pressurized tube materials in petro-chemical equipments. So FES-DP decision-making system for safety evaluation of high temperature tubes had been developed. This paper described the basic structure of FES-DP, and took Cr5Mo steel as an example to develop the strategy to evaluating residual life. The formula of P=29.608-Z-5.085lgσ expresses a group of curves paralleling to the creep-rupture strength main curve of Cr5Mo steel. The relationship between creep-rupture strength deterioration and mi-crostructure degradation is founded:Z=0.203(E-1), Z and E is the degree of creep-rupture strength deterioration and the grade of microstructure degradation respectively. So the residual life can be predicted by analyzing the microstructure degradation of the components.
  • LIU Bao-feng, LI Pei-lan
    2004, 0(4): 46-48.
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    LIU Bao-feng, LI Pei-lan. Study on the Manufacture Technology of Large Tow Carbon Fiber Prepreg with Hot-melt Method[J]. Journal of Materials Engineering, 2004, 0(4): 46-48.

    The manufacture process of large tow carbon fibre (60K) prepreg with hot-melt method is briefly introduced in this paper; in addition, several typical factors, which affect the quality of the prepreg, were also discussed in detail. In the end, the conclusion is made that the impregnating temperature, fibre tension, pressure and line speed should be controlled strictly in order to make the 60K carbon fibre spreading and wetted very well.
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