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Volume 0,Issue 1,1994 Table of Contents

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  • 1  Advance on the Development of Al-Li Alloys
    Wei Jianfeng He Ming
    1994(1):1-6.
    [Abstract](1277) [HTML](137) [PDF 0.00 Byte](1)
    Abstract:
    This paper presents a series of Al-Li alloys and their productive capacity all over the world. The application and improvement of Al-Li alloys are also described in the paper.
    2  Metal Fibers and Recent Advances
    Liu Gutian
    1994(1):7-15.
    [Abstract](1169) [HTML](132) [PDF 0.00 Byte](0)
    Abstract:
    brief introduction is presented for the recent advances in methods of preparing metal fibers including bundle-drowing. chatter- machining and melt-spinning. The status of study and applicataion of metal fibers is also described in this paper.
    3  Kinetics of Isothermal Transformation in Two Phase TiAl-based Alloys
    Han Chuanxi
    1994(1):16-20.
    [Abstract](1328) [HTML](129) [PDF 0.00 Byte](1)
    Abstract:
    inetics of isothermal transformation of supersaturated phase of ordered a2 was investagated with method of quantitative metallographic examination and X- ray diffraction. The relationship between the amount of 7 phase precipitation and the isothermal transformation time with the both method is agreed. The rate of isothermal transformation in alloy 45Al is larger remarkably than the one in alloy 42Al. Under the eutectoid temperature in Ti- Al phase diagram the rate of transformation decreases with temperature,ho it is.not able that the isothermal transformation curve becomes the shape of letter C.
    4  The Stress Relaxation Beharior in Metal Powder Compression Process
    Chen Zhenhua
    1994(1):21-25.
    [Abstract](1054) [HTML](131) [PDF 0.00 Byte](0)
    Abstract:
    探讨了粉末应力松弛的基本规律,提出了粉末应力松弛的流变机理,采用非线性流变模型定量描述了粉末应力松弛的应力和应变关系,计算结果表明,理论计算值和实验值吻合良好。
    5  Influence of Process Conditions on Lattice Parameter of High Textured YBa2Cu3O7 Thick Films
    Liu Chunfang Tang Hui Xu Jingren Zhou Lian
    1994(1):26-30.
    [Abstract](1163) [HTML](141) [PDF 0.00 Byte](0)
    Abstract:
    he lattice parameter c values of highly textured YBCO thick films were calculated by using an X-ray diffraction dual-line method. The lattice parameter values of samples prepared on Ni substrate rather smaller than those of sintered samples and thick films prepared on Ag-Pd substrate. Increasing substrate temperature during spray, sintering temperature after spray, and moving speed of smsples during zone melting makes lattice Parameter c decrease. Generally, the samples which have higher To have rather smaller lattice parameter c values.
    6  Effect of Zirconium Addition on the Property Stability of CuZnAl Alloy
    Zeng Yuxiao Tan Shusong
    1994(1):31-34.
    [Abstract](1215) [HTML](134) [PDF 0.00 Byte](1)
    Abstract:
    ffect of Zr addition on the property stability of CuZnAl alloy was investigated. It showed. Zr- doped could reduce martensite stabilization trend and improve property stability in the mid-temperature. X-ray diffraction results showed that Zr restrained the variation of order parameter and the formation of equilibrium phase when the alloy aged in the mid-temperature.This might have relation with the change of excess vacancy concentration which resulted from grain refining.
    7  The Effect of Testing Temperature on Low Cycle Fatigue Behavior of Zircaloy-4
    Xiao Lin Gu Haicheng
    1994(1):35-39.
    [Abstract](1158) [HTML](135) [PDF 0.00 Byte](0)
    Abstract:
    研究了室温和400℃去应力退火状态Zr-4合金对称拉-压低周疲劳行为。建立了循环和单调加载方式下Zr-4合金应力-应变曲线方程和循环应变幅-疲劳寿命之间的关系;分析了温度对Zr-4合金变形行为和疲劳性能的影响;讨论了高温疲劳寿命预测方法;根据疲劳断口SEM观察结果,分析了Zr-4合金在室温和400℃疲劳断裂方式的异同。结果表明,Zr—4合金室温下的循环应力-应变曲线表现为循环硬化,而400℃下表现为循环软化;室温和400℃下的循环应变幅-疲劳寿命关系分别为△εp·Nf0.7668=48.94,△εp·Nf
    8  The Investigation of Preparing Si_3N_4 Powder by Carbon Reduction From SiO_2
    Li Yingquan Liao Jichang Deng Chaoquan Wang Zhi Xuan Linjie Zhang Renqi
    1994(1):40-49.
    [Abstract](1479) [HTML](125) [PDF 0.00 Byte](6)
    Abstract:
    he investigating results of preparing high Performance Si3N4 powder by carbon reduction and nitridation from SiO2 is reported in this paper.lt has been studied that the effeCt of the technological factors such as the nitriding temperature,the nitriding time and nitrogen flow,etC.on the colour,particle shape,Pareicle size, particle distribution and phase structure of the nitriding products. The forming conditions of the amorphism,SiO2 and SiC products are discussed.Results show that the nitriding technological factors influence obviously the performances of the nitriding products.High quality St3N. POwder with high a phase ratio,fine particle and homogeneous particle distribution can be prepared by the technological conditions of using the nitriding temperature 1450t,the nitriding time 2h and the nitrogen flow 2.5L/ min.
    9  Development of Ti/ PbO_2 Electrode
    Yang jianchao Pan Huibo Chen Fengyun Ju He
    1994(1):50-56.
    [Abstract](1310) [HTML](132) [PDF 0.00 Byte](0)
    Abstract:
    研究了工艺参数对制备PbO2/Ti电极性能的影响,通过SEM、XRD和强化寿命结果分析,得出了制备Pbo2/Ti电极的最佳工艺条件即镀β-PbO2的最佳电流密度3A/dm2,镀液温度60℃。试验结果表明,在H2SO4、HNO3介质中,对析氧反应而言,Ti/PbO2电极具有好的催化活性和高的阳极电位;在150g/LH2SO4、60℃、200A/dm2条件下,强化寿命最高达1309h。
    10  Investigation of Increasing Molybdenum Powder Size with Added Raw Material Method
    Xiong Zisheng Zhu Rui Deng Zuoqing
    1994(1):57-61.
    [Abstract](1231) [HTML](134) [PDF 0.00 Byte](0)
    Abstract:
    叙述了在钼粉的工业化生产条件下采用原料添加法来提高最终粉末粒度,改善原料工艺性能的试验。研究表明:在钼酸铵原料中添加一定组份的钥粉,能有效地改善钼酸铵在动态焙解还原时的分散性和流动性,选择不同的添加量和添加粉粒度,可有效地把钼粉的FSSS粒度从2.5μm提高到4.2μm,从而可根据用粉要求,选择合适的添加工艺,来制取理想的钼粉。
    11  Laser Cutting of Titanium Alloy
    Wang Kunlin Zang Donghong Zhu Runming
    1994(1):62-65.
    [Abstract](1634) [HTML](132) [PDF 0.00 Byte](0)
    Abstract:
    The effects of different aid-gases and technological parameters on laser cutting of titanium alloy have been investigated. The characters of cut plane and heat affected zone of laser cutting have been analyzed. The experimental results show that the best cutting quality can be obtained when argon is used as an aid-gas. The laser power and cutting speed have of feets on the cutting width and heat affected zone. The cut plane can be divided into two zones which have different appearance. There is a distinguishing boundary between the two zones. The width of heat affected zone on upper surface is narrower than that on lower surface.
    12  The Method of Measuring the Pressure of Hydrogen During the Hydrogen-Charging of Gases to Ti-Alloy
    Weng Wenda Lin Tianhui
    1994(1):66-68.
    [Abstract](1384) [HTML](132) [PDF 0.00 Byte](1)
    Abstract:
    wo methods of measuring differential pressure of hydrogen- the gas flow method and the gas weight method are presented and compared each other during the hydrogen-charging to Ti-alloy.lt is shown that the results obtained by two methods are basically indentical.
    13  Implant Metal and Shape Memory Alloys
    Sun Qi Yang Haibo
    1994(1):69-73.
    [Abstract](1343) [HTML](129) [PDF 0.00 Byte](0)
    Abstract:
    his article Presents the historical development of the implant metallic malerials in human body. The characters of the stainless steel, cobaltchormium alloys,titanium alloys and new type of biological engineering metallic materials-shape memory alloys are described. The domestic-oversea general situation and the PractiCeS of their application are also presented in this paper.
    14  Modern Development of Structural Intermetallics-Summarization of lst International Symposium on Structural Intermetallics
    Wu Yiqin
    1994(1):74-77.
    [Abstract](1265) [HTML](129) [PDF 0.00 Byte](0)
    Abstract:
    he lst International Symposium on Structural Intermetallics is introduced in this poper.The important achievements in the field of Intermetallics in the world and their prospects in application developments are also reviewed.

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