Effect of Ni3Al on the WC morphology in WC-Co-Ni3Al Composites

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• 作者：Jianzhan LongZhongjian ZhangTao XuWeibing ZhangXiuyu WeiBizhi Lu
• 会议时间：2014-08-20
• 关键词：WC morphology ; cemented carbide ; Ni3 Al ; WC-Co-Ni3Al Composites
• 作者单位：State Key Laboratory of Cemented Carbide,Zhuzhou, Hunan 412000,China;Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou, Hunan 412000,China
• 母体文献：2014(郑州)中西部第七届有色金属工业发展论坛论文集
• 会议名称：2014(郑州)中西部第七届有色金属工业发展论坛
• 会议地点：郑州
• 主办单位：中国有色金属学会
• 语种：chi

摘要

WC-Co-Ni3 Al composites were prepared from WC+ Ni3 Al prealloyed powder and balanced coarse WC and Co powders by conventional powder metallurgy technology.The effect of Ni3 Al content on the WC morphology in WC-Co-Ni3 Al composites was investigated using scanning electron microscope and transmission electron microscopy.The results show that, with the increase of Ni3Al content in WC-36 vol% (CoNi3 Al)composites,the WC grains become rounder and finer.The dependence of WC grain shape on the Ni3 Al content is attributed to the different solubility of W in binder.Consequentially, with increasing the sintering time, surfaces of WC grains are strongly micro-faceted and stepped.Similar WC grain growth behavior in WC -36 vol% (Co-Ni3 Al)composites as that in WC-Co cemented carbide is considered to be responsible for the appearance of the faceted WC shape in WC-Co-Ni3 Al alloy.