摘要
采用放电等离子烧结技术将WO3、Co和炭黑的混合粉原位合成为致密WC-Co块体,研究了合成工艺、配碳量和晶粒长大抑制剂VC、Cr3C2对块体的物相、致密度和显微组织的影响,测定了块体的硬度和断裂韧性.结果表明:配碳量低时,块体中有缺碳杂相Co3W9C4或Co3W3C,密度较高;增加配碳量,块体的物相为纯．WC和Co;配碳量过大,块体中出现游离碳,密度降低;添加抑制剂使晶粒尺寸保持在0．5μm以下．
WO3, Co and carbon-mixed powder was in-situ synthesized to compact WC - Co bulk by spark plasma sintering. The effect of the synthesis parameters and the carbon content on the phase as well as the density and the microstructure of the bulk have been studied, The hardness and the K Ic of the bulk have been determined. When the carbon content is low, Co3W3C or Co3W9C4 appear and the density is high. Only WC and Co are found with higher carbon content. Free carbon appears with the high carbon content, and the density is low. The grain size of WC - Co bulk is below 0.5μm with inhibitor VC ,Cr3C2.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第6期564-566,共3页
Materials Science and Technology
基金
北京市教委资助项目(KM200410005006).
