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《Materials Science and Engineering of Powder Metallurgy》 2014-06
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The effect factors on morphology of nanophase WC-Co composite powder

GUO Sheng-da;YANG Jian-gao;CHEN Hao;ZHU Er-tao;Lü Jian;Project Research Institute, Jiangxi University of Science and Technology;Engineering Research Center of Tungsten Resources High-efficiency Development and Application Technology of the Ministry of Education;Advanced Corporation for Materials & Equipment;  
Nanophase WC-Co composite powder is applied widely with the fast development of modern industry and has a large market potential. Through the use of ammonium metatungstate(AMT), soluble cobalt salt, organic carbon and carbon black as raw materials, composite powders were prepared by spray conversion and low temperature reduction-carbonization methods. The effects of atomization speed, transition temperature and selection of carbon to morphology of nanophase WC-Co composite powder were studied. The results show that, the appearance structure of composite powders is shell spherical, grain size is less than 100 nm, while a phenomenon of pores and particle breakage exist, Co-phase presents fcc-structure. Within a certain range, the particle size increases with decreasing atomization speed; the degree of spherical powder decreases with increasing transition temperature; the particle size of composite powder prepared by organic carbon is bigger and the shell wall is thinner than that of prepared by carbon black.
【Fund】: 国家国际合作专项(2011DFR50970);; 国家863计划项目(2012AA061902);; 国家自然科学基金(51174101);; 湖南省科技重大专项(2012FJ1009)
【CateGory Index】: TB383.1;TF122
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