Carbides are solid and durable metallic materials capable of retaining these properties at 900-1150 ° C. Basically made of highly rigid and refractory materials based on tungsten carbide, titanium, tantalum, chromium, bonded by cobalt, at different contents of cobalt or nickel.
Hard alloys are distinguished by metal carbides in them:
- Tungsten carbides –K05, K10, K20, K30;
- Titanium tungsten carbides – P01, P01C, P20, P30;
- Titanium tantalum tungsten carbides– M20, M40.
Hard alloys are currently common tool material widely used in the tool industry. Due to refractory carbides in the structure, carbide tool has high hardness HRA 80-92 (HRC 73-76), heat resistance (800-1000 ° C), so they can operate at speeds several times faster than cutting speeds for high-speed steels.
However, unlike the high-speed steel, hard alloys have low strength 1000-1500 MPa, do not have toughness. Carbides are low-tech, because of the great hardness of them it is impossible to produce hard tool, moreover, they are polished limited – only by a diamond tool, so hard alloys are used in the form of plates, which are either mechanically fixed to the tool holder or soldered to it.