
Ultrafine grain?tungsten?carbide is a kind of cemented carbide made up of tungsten carbide (or other carbide) powder less than 0.3μm?and cobalt bonded phase. With the decrease of WC grain size, the toughness and hardness of the cemented carbide can be improved. Because the WC grains become smaller, the high dispersion of the cobalt bonded phase is increased, and the WC grains are more evenly dispersed among the cobalt bonded phases. The hardness at high temperature and compressive strength at room…