钨─钴混合氧化物直接气相还原／碳化相变过程  

PHASE TRANSITION OF W-CO OXIDE MIXTURE DURING DIRECT REDUCTION/CARBURIZATION BY H_2/CH_4

作　　者：吴恩熙[1] 钱崇梁[1] 张卫兵[1] 

机构地区：[1]中南工业大学粉末冶金国家重点实验室,株洲硬质合金厂三分厂

出　　处：《中南工业大学学报》1996年第3期303-307,共5页Journal of Central South University of Technology(Natural Science)

基　　金：中国有色金属工业总公司"八五"科技攻关计划基金

摘　　要：用ＸＲＤ和ＳＥＭ对钨－钴混合氧化物（Ｗ２０Ｏ５８＋Ｃｏ３Ｏ４）的氢还原及在不同组成的Ｈ２／ＣＨ４混合气体中的碳化过程进行了研究．结果表明，在８５０℃以上氢还原产物是α－Ｗ＋Ｃｏ３Ｗ＋Ｃｏ７Ｗ６三相混合物．纯蓝钨（Ｗ２０Ｏ５８）或钨－钴混合氧化物都能在较低的温度下（９００～１０００℃）被甲烷气相碳化成ＷＣ，碳化速度和游离碳的析出均与碳化温度及Ｈ４／ＣＨ４混合气相的组成有关．The processes of H2-reduction and carburization by hydrogen/methane mixtures with rarious gas phase composition for the tungsten-cobalt oxide mixture (W20O58+Co3O4)wereinvestigated by means of XRD and SEM analyses. The results show that the oxide mixture was reduced to a-W, Co3W and Co7W6 at the temperatures higher than 850 ℃ in H2. The pure blue tungsten oxide (W20O58) or W-Co oxide mixture can be carburized with H2/CH4 gas mixture at lower temperature (900～1000℃). Both the carburizing rate and the deposition of free carbon are closely related to the caburizing temperature and the H2/CH4 mixture constitution. The present paper gives an optimal combination of processing parameters for the carburization.

关 键 词：钨氧化物 钴氧化物 氢还原 混合粉 碳化 

分 类 号：TF111.13[冶金工程—冶金物理化学]