Peculiarities of Vacuum Sintering of Tungsten Carbide-Cobalt Nanopowders Obtained by Using Thermal Plasma

摘要：

　　The process of vacuum sintering of tungsten carbide-cobalt composites with or without grain size inhibitors is investigated.The average grain size of pure tungsten carbide is 40-60 nm.The influ.ence of process parameters such as temperature and time hold on the structure and porosity obtained hard alloy is studied.The accurate regulation of carbon con tent in tungsten carbide make possible to avoid the ap pearance of double carbide (eta-phase) as well as ab normal grain growth in material structure even on the solid-phase sintering.The quantity of snbmicronic pores forming during sintering of such powders can be sharply decreased under hold in vacuum at the temper ature below start of sample displacement.The possibili ty of saving of considerable part of carbide particles in the structure less than 100 um in diameter is shown.Obtained hard alloys have higher Vickers hardness and fracture strength on 25 % ~ 30 %.

关键词： nanopowders tungsten carbide vacuum sintering nanostructural hard alloy

作者: Y.V.Blagoveshchenskiy N.V.Isaeva Y.I.Melnik N.V.Blagoveshchenskaya Y.V.Levinsky G.M.Voldman V.V.Falin

作者单位: A.A.Baikov Institute of Metallurgy and Material Science of RAS 119991 Leninskiipr.49,Moscow,Russia LLC R&D company VacETO 125047,4 Tverskaya-Yamskaya 6/12,70 Moscow,Russia

会议类型: 国际会议

会议名称: The 12th China-Russia Symposium on Advanced Materials and Technologies(第十二届中俄双边新材料新工艺国际会议)

会议地点: 昆明

会议语种:英文

页码: 13-17

在线出版日期: 2013-11-19（万方平台首次上网日期，不代表论文的发表时间）