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; 文献标志码:A Enlightenment of geochemistry on separation of molybdenum and tungsten ZHAO Zhong-wei, HE Li-hua (School of Metallurgy and Environment, Central South... been also attracted much attention in metallurgy. Taking the separation of tungsten and molybdenum in tungsten and molybdenum metallurgy as an example, the enlightenment of geochemistry......
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Metallurgy, Central South University, Changsha 410083, China; 3. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China) Abstract: Tungsten powders were prepared by two...下不同还原方式所得初生W晶粒的HRTEM像 Fig. 5 HRTEM images of initial tungsten grains reduced at 760 ℃ for 30 min 氧化钨普通氢还原过程中,W粉颗粒的还原长大机制以"挥发-沉积"为主.在"挥发-沉积"机制中,气相迁移是一个长程快速过程,W粉晶粒通过水合氧化物WO2(OH)2的挥发→迁移→沉积→还原过程不断长大......
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......
Article ID: 1003-6326(2005)06-1333-08 Microstructure and wear properties of tungsten carbide reinforced steel matrix composites YOU Xian-qing(尤显卿)1, SONG Xue-feng(宋雪峰)1, REN Hao(任 昊...]. Tungsten carbide has high hardness, good wear resistance and impact as well as strong wetting cohesion between duplex phase, i.e. WC phase and matrix phase. Over the last decade, attempts to produce WC......
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......
on tungsten fibers by sol-gel methodMA Yun-zhu, HUANG Qian-fang, LIU Wen-sheng(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)Abstract:Taking the cerium nitrate as raw material, CeO2 coating on the pretreated tungsten fiber was fabricated by sol-gel method. The preparation process of Ce sol was explored, and coating effects were studied systematically via......
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:......
Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material Hyun-Seok TAK1, Chang-Seung HA2, Dong-Hyun KIM2, Ho-Jun LEE2.... For machining difficult-to-cut materials, such as tungsten carbide, micro-electrical discharge machining(EDM) is one of the most effective methods for making holes because the hardness is not a dominant......
