A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） wa...A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） was first formed by a spray-pyrolysis technique, which was then mixed with carbon black and converted to WC-Co composite powder at 950℃ for 4 h in N2 atmosphere. The resulting powder has a particle size of 100-300 nm.展开更多
基金This work is sponsored by the National High—Tech Research and Development Pr0gram of China(863 Pr0gram)(special subject for nano—materials)(Grant No．2O02AA3O25O4，2002—2005)the Key Project for the Sci．＆ Tlech．Development Program of Wuhan．Hubei，China(Grant No．20041 003068一O4，2004—2006)+1 种基金the NationaI NaturaI Science Foundation of China(Key Pr0gram)(Grant No．50220160657，2003—2005) Key Project of Ministry of Education of China(2005—2006)．
文摘A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） was first formed by a spray-pyrolysis technique, which was then mixed with carbon black and converted to WC-Co composite powder at 950℃ for 4 h in N2 atmosphere. The resulting powder has a particle size of 100-300 nm.
