纳米WC-Co复合粉末形貌的影响因素  

The effect factors on morphology of nanophase WC-Co composite powder

作　　者：郭圣达[1,2] 羊建高[1,2,3] 陈颢[2] 朱二涛[1] 吕健[1] 

机构地区：[1]江西理工大学工程研究院,江西赣州341000 [2]钨资源高效开发及应用技术教育部工程研究中心,赣州341000 [3]湖南顶立科技有限公司,长沙410111

出　　处：《粉末冶金材料科学与工程》2014年第6期1000-1005,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：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)

摘　　要：随着现代工业的快速发展,纳米WC-Co复合粉末得到越来越广泛的应用,具有巨大的市场发展潜力。分别以偏钨酸铵(AMT)、可溶性钴盐、有机碳和超纯碳黑为原材料,采用喷雾转化和连续低温还原碳化法制备纳米WC-Co复合粉末,研究雾化转速、转化温度、碳源的选取对纳米WC-Co复合粉末形貌的影响。研究表明:纳米WC-Co复合粉末呈空壳球形结构,晶粒尺寸在100 nm以下,壳体有大量孔隙并存在破裂现象,Co相以fcc结构存在。在一定范围内,随雾化转速降低,颗粒尺寸增大;随转化温度升高,粉末球形化程度降低;有机碳源制备的复合粉末比碳黑制备的颗粒尺寸更大,壳壁更薄。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.

关 键 词：纳米WC-Co复合粉末 喷雾转化 低温还原碳化 形貌 

分 类 号：TF123[冶金工程—粉末冶金]