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.
Colin, C., Durant, L., Favrot, N., Besson, J.-L., Barbier, G., & Delannay, F. (1994). Processing of Functional-gradient Wc-co Cermets By Powder-metallurgy. International Journal of Refractory and Hard Metals, 12(3), 145-152. https://doi.org/10.1016/0263-4368(93)90064-M (Original work published 1994)