STUDY ON Ni-Cr SYSTEM SOLAR SELECTIVE THIN FILMS PREPARED BY MAGNETRON REACTIVE SPUTTERING PROCESS

1. IntroductionSolar selective thiIl solid fil1us are the key part for solar heat collect'ors. But ll1ostfactories still produced solar absorptive filn1s by traditional tecIl11ology sucl1 as pai1ltillga1ld electrocl1eluical process that nlust result in po…     

CREEP CRACK PROPAGATION IN CONVENTIONAL CAST AND DIRECTIONALLY SOLIDIFIED SUPERALLOY RENE 80

The creep crack propagation in superalloy René80 of two different microstructures,i.e.,equiaxed grain structure by conventional casting and columnar grain by directionalsolidification,was investigated under static load at 1123 K.The creep crack growth rate,da/dt,seems to be correlated with the stress intensity factor,K.The creep crack growth ratein the directionally solidified alloy is lower than that in the conventional cast alloy,owing tothe elimination of transverse grain boundaries.The effect of microstructure on creep crackpropagation has also been discussed.     

ACICULAR MARTENSTTE IN LASER TREATED GREY CAST IRON

<正> 马氏体作为重要的合金相,一直是人们感兴趣的研究课题,利用激光对金属表面进行相变硬化,可以得到特殊的淬火组织。文献[2—4]对铸铁的熔凝区进行了详细的研究。我们在对灰铸     

微型齿轮注射成型的模拟分析与试验研究

选用微型齿轮结构作为研究对象，在使用MoldFlow进行模拟分析的基础上．对微型齿轮注射成型进行试验研究。     

超细金属粉末的制备方法

介绍了机械法、物理法、物理-化学法等超细金属粉末的制备方法和研究进展及生产应用情况.虽然超细金属粉末的制备方法有很多种,但每种方法都有一定的局限性,存在许多需要解决和完善的问题.机械法是制备金属粉末的基本方法,但大多数机械法在制取粉末后存在分级困难的问题;旋转电极法和气体雾化法是目前制备高性能金属及合金粉末的主要方法,但生产效率低,超细粉末的收得率不高,能耗相对较大;气流磨粉碎法、氢化脱氢法适合大批量工业化生产,但对原料金属或合金的选择性较强.     

The focused-ion-beam microscope—More than a precision ion milling machine

The focused-ion-beam (FIB) microscope has evolved into an important microstructure characterization instrument. The capability of high-resolution imaging using both secondary electron and secondary ion signals has made the FIB microscope a unique imaging tool. Stress-free cross sectioning using the primary gallium ion beam provides valuable microstructure information beneath the specimen surface. In addition, FIB techniques are often preferred to prepare transmission-electron microscope (TEM) specimens, which are frequently impossible to make by any other conventional methods. In this paper, various FIB microscopy applications in microstructural characterizations are discussed using examples from recent research, and conventional FIB-TEM specimen preparation techniques are illustrated.     

基于数值模拟的等效拉延筋设计与优化

拉延筋在汽车覆盖件拉深成形中起着十分重要的作用。利用拉延筋可以在较大范围内调节和控制板料的变形程度和变形分布,抑制破裂、起皱、面畸变等多种冲压质量问题的产生。在很多情况下,拉延筋的设置合理与否将决定覆盖件拉深的成败。文章借助eta/DYNAFORM软件,模拟某轿车B柱加强板在无/有拉延筋的模具上进行拉深的全过程,通过模拟结果分析比较,确定拉延筋的合理布局及数量,最后结合正交实验法,优化拉延筋的结构参数。     

非稳态轧制时轧机振动稳定性的数值分析

利用轧制理论方程和机械振动理论的能量判据 ,给出了一个较精确的分析轧机传动系统扭转振动稳定性的数值计算方法     

Extraction-chromatographic Separation of Microamount Scandium(Ⅲ)with HEH(EHP) Resin and Its Analytical Application

The optimum conditions for the extraction-chromatography by using 2-ethylhexyl-2-ethylhexyl-phosphonate resin to separate scandium(Ⅲ)from large amounts of other metal ions were reported.A me-thod for the separation and determination of microamount of scandium has been developed.This methodgives higher accuracy and reproducibility than solvent extraction with PMBP,especially,for the samplescontaining high content of titanium.Many shortcomings of other methods ever reported can be overcomeby the present method.