Tungsten carbide platelet-containing cemented carbide with yttrium containing dispersed phase  

作　　者：张立 陈述 王元杰 余贤旺 熊湘君 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University [2]Changsha Mining and Metallurgy Research Institute

出　　处：《中国有色金属学会会刊：英文版》2008年第1期104-108,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50574104)supported by the National Natural Science Foundation of China

摘　　要：A fine and platelet tungsten carbide patterned structure with fine yttrium containing dispersed phase was observed in liquid phase sintered WC-20%Co-1%Y2O3 cemented carbide with ultrafine tungsten carbide and nano yttrium oxide as starting materials.By comparing the microstructures of the alloy prepared by hot-press at the temperature below the eutectic melting temperature and by conventional liquid phase sintering,it is shown that hexagonal and truncated trigonal plate-like WC grains are formed through the mechanism of dissolution-precipitation(recrystallization)at the stage of liquid phase sintering.Yttrium in the addition form of oxide exhibits good ability in inhibiting the discontinuous or inhomogeneous WC grain growth in the alloy at the stage of solid phase sintering.A fine and platelet tungsten carbide patterned structure with fine yttrium containing dispersed phase was observed in liquid phase sintered WC-20% Co-1%Y2O3 cemented carbide with ultrafine tungsten carbide and nano yttrium oxide as starting materials. By comparing the microstructures of the alloy prepared by hot-press at the temperature below the eutectic melting temperature and by conventional liquid phase sintering, it is shown that hexagonal and truncated trigonal plate-like WC grains are formed through the mechanism of dissolution-precipitation （recrystallization） at the stage of liquid phase sintering. Yttrium in the addition form of oxide exhibits good ability in inhibiting the discontinuous or inhomogeneous WC grain growth in the alloy at the stage of solid phase sintering.

关 键 词：水泥碳化物 碳化颗粒 烧结处理 钇元素 

分 类 号：TG135.5[一般工业技术—材料科学与工程]