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Ultrafine particles stand for granules with diameter less than 0.5 ?m. For their extremely small size and large specific surface area, these sub-micron powders can be widely used as catalysts... nickel powders, but there is no carbon or oxygen element after the hydrogen deoxidation. 4 Conclusions 1) Ultrafine core-shell nickel spheres are fabricated via a simple chemical method using self......
STUDY ON PREPARATION OF YBa2Cu3O7-x ULTRAFINE POWDERS BY SOL-GEL PROCESS袁启华,邬江新,唐福龙,黄俊摘 要:<正>The ultrafine powders of YBa2Cu3O7-x withthe size of 100nm were synthesized by Sol-Gel process using cit-rate as complex and ammonium hydroxide to adjust pH of solu-tion. The process of Sol formation and Gel polymerization ofYBa2Cu3O7-x in the Sol-Gel......
Shape-controllable Synthesis of Ultrafine ZnO Powders of Different MorphologiesXiaoyi Shen,Yuan Liang,Yuchun Zhai,Zhiqiang NingSchool of Materials and Metallurgy, Northeastern University摘 要:By employing zinc acetate and sodium hydroxide as raw materials, ultrafine ZnO powders with different morphologies were successfully synthesized through hydrothermal......
with the help of ultrafine ceramic powders made by self-propagating high-temperature synthesis (SHS) process. The SHS powders were fabricated by the chemical reaction between micro-sized SiC and Al... properties. 4 Conclusions 1) Self-propagating high-temperature synthesis (SHS) process can easily fabricate SiC-Al composite powders contained ultrafine SiC ceramic particles in Al powder matrix. 2......
Preparation of ultrafine WC-10Co composite powders by reduction and carbonizationSHEN Ting-ting(申婷婷), XIAO Dai-hong(肖代红), OU Xiao-qin(欧小琴), SONG Min(宋旼), LI Xiu-xiu(李秀秀), HE Yue-hui(贺跃辉)(State Key Laboratory of Powder Metallurgy (Central South University), Changsha 410083, China)Abstract:A solid state synthesis of ultrafine/nanocrystalline WC-10Co composite powders was reported from WO3, Co3O4......
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and tap density. Ultrafine nickel powders with submicron size and spherical shape were synthesized by the hydrazine reduction of nickel sulfate in ethanol-water solvent. The effects of reaction... and high tap density has been one of the key technologies for the manufacture of MLCCs. Preparation of ultrafine nickel powders has attracted a great deal of attention over the past decades due......
Low-temperature Rapid Synthesis of Ultrafine Hafnium Carbide Ceramic Powders吴洁,王为民,LIU ChunState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology摘 要:Nano hafnium carbide(HfC) powders were synthesized by sol-gel combining hightemperature rapid heat treatment process using citric acid and hafnium......
J. Cent. South Univ. Technol. (2007)06-0773-06 DOI: 10.1007/s11771-007-0147-4 Effect of anions on preparation of ultrafine α-Al2O3 powder XIAO Jin(肖 劲)1, QIN Qi(秦 琪)1...; 2. China Enfi Nonferrous Engineering Co. Ltd, Beijing 100038, China) Abstract: Ultrafine alumina power was obtained by calcining the precursor at 1 200 ℃ for 2 h, which was prepared by homogeneous......
Effect of VC and NbC additions on microstructure and properties of ultrafine WC-10Co cemented carbides XIAO Dai-hong(肖代红)1, HE Yue-hui(贺跃辉)1, LUO Wei-hong(罗伟红)2, SONG Min(宋 旼)1 1. State Key...; Abstract: The nanocomposite WC-Co powders were prepared through planetary ball milling method. Effects of grain growth inhibitor addition and the vacuum sintering parameters......
