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Influences of fine pitch solder joint shape parameters on fatigue life under thermal cycle HUANG Chun-yue(黄春跃)1, 2, WU Zhao-hua(吴兆华)2,HUANG Hong-yan(黄红艳)2, ZHOU De-jian(周德俭)2 (1. School of Electro... parameters have been applied in practice to assemble the 240-pin, 0.5mm pitch QFP. Key words: fine pitch; solder joint shape; nonlinear finite element analysis; thermal fatigue life CLC number: TG405......
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Research on Laser Cladded Nickel Based Nanometer Tungsten Carbide Composite Coating DAI Jian-qiang1,ZOU Chang-gu1,YAN Min-jie1,XI Wen-long1,ZHANG Guang-jun1,GE Da-fang1,WANG Hui-Ping1 (1.Shanghai... of nanometer WC/Co introduced into the coating plays an important role in the laser cladding processes. 关键词:Laser cladding; nanometer granulation; nickel based tungsten carbide coating......
J. Cent. South Univ. (2012) 19: 1711-1717 DOI: 10.1007/s11771-012-1197-9 Adsorption mechanism of mixed salicylhydroxamic acid and tributyl phosphate collectors in fine cassiterite electro-flotation... separately or together for electro-?otation of fine cassiterite (<10 μm). Subsequently, the ?otation mechanism of the fine cassiterite was investigated by adsorbance determination, electrophoretic......
Influence of earth gravity on reaction engineering of tubular reactor for high concentration tungsten ion-exchange ZHAO Zhong-wei(赵中伟), XIAO Lu-ping(肖露萍), GUO Chi-hao(郭持皓), CHEN Xing-yu(陈星宇... beneficial compared with downflow-feeding mode, since the flow pattern of the fluid in the reactor is closer to plug flow. The result of dynamic experiment conducted in ion-exchange of tungsten......
of fine scheelites from flotation tailings by flotation column HUANG Guang-yao, FENG Qi-ming, OU Le-ming, LU Yi-ping, ZHANG Guo-fan (School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China) Abstract: In order to recover fine scheelites from flotation tailings of cleaner circuit, a novel flotation column, which using microcellular material as bubble......
High Temperature Gaseous Rare-Earth Permeation of Polyoxotungstates:An New Effective Method for the Preparation of Tungsten Bronzes 郭元茹1,韦永德1,李中华1,周百斌1 (1.Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China) Abstract:New polyoxometalate α-K12H3[Y(BW11O39)2]·25H2O was synthesized and treated by high temperature gaseous rare earth permeation to prepare tungsten......
PREPARATION OF NANOSTRUCTURED TUNGSTEN POWDERS曹立宏,傅磊,樊友三摘 要:<正>The preparation of nanostructured tungstenpowders has been studied by using.... Tungsten powders ofmean particle size of 40 nanometer,and specific surface areaof 3×104m2/kg have been prepared. The shape of nanostruc-tuted tungsten powders is sphere.关键词:......
