Influence of copper content on the microstructure and hardness of copper-doped tungsten carbide-cobalt bulk at the elevated temperature

摘要

Ultraflne WC-Co cemented carbides doped with 0,0.5,1,1.5 and 2 wt.% Cu were fabricated by the sintering/ hot isostatic pressing (sinter-HIP) process for the mixed WC and chemical precipitated Co-Cu powders. The Vickers hardness of cemented carbides was measured at temperatures ranging from room temperature to 800 °C. The Cu-doped WC-Co alloys with the higher proportion of WC hard phase and finer microstructure of the average grain size of 590 nm exhibit the higher hardness at the elevated temperature of 800 °C The Cu-doped WC-Co cemented carbides have a potential application in machining.