TiN, TiCN, TiAlN and Al3O2 with good wear resistance such as TiN, TiAlN and Al3O2, etc. coating thickness of 2 ~ 18μm, the coating usually has more than the tool substrate and the workpiece material Low thermal conductivity, weakened the thermal effect of the tool substrate; the other hand, can effectively improve the cutting process of friction and adhesion, reduce the generation of cutting heat.

Coated carbide cutting tools and carbide compared to both in strength, hardness and wear resistance have been greatly improved. Turning hardness HRC45 ~ 55 of the workpiece, low-cost coating carbide can achieve high-speed turning. In recent years, some manufacturers to improve the application of coating materials and other methods, so that the performance of coated tool has been greatly improved. Such as the United States, Japan, some manufacturers use the Swiss AlTiN coating materials and new coating patented technology to produce coated blade, hardness up to HV4500 ~ 4900, at 498.56m / min speed cutting hardness HRC47 ~ 58 die steel. In the turning temperature of up to 1500 ~ 1600 ° C when the hardness is not reduced, no oxidation, the blade life of four times the general coating blade, while the cost is only 30%, and good adhesion.