Processing of functional-gradient WC-Co cermets by powder metallurgy

WC-Co cemented carbides are widely used as machining tools, mining tools, and wear-resistant parts. Multilayer graded structures with Co content ranging from 10 to 30 wt.% from one side of the structure to the other have been prepared by using either solid-state or liquid-phase sintering. Post-hot isostatic pressing was used to improve the final density of some of these samples. Special attention was given to the homogenization process that occurs during liquid-phase sintering of the graded structures.