A powdered form of refractory carbide united by compression with a bonding material (usually iron, nickel, or cobalt), followed by sintering. Tungsten carbide is bonded with cobalt at 1400C; from 3 to 25% of cobalt is used, depending on the properties desired. Used chiefly in metal-cutting tools that are hard enough to permit cutting speeds in rock or metal up to 100 times that obtained with alloy steel tools.