Coated carbide in toughness of carbide cutting tools coated with a layer or layers on the good wear resistance tin, ticn, tialn and al2o3 etc., coating thickness of 2 ~ 18μm, the coating typically has a ratio heat transfer coefficient matrix tool and the workpiece material much lower, weakening the thermal effect of the tool substrate; on the other hand can effectively improve the friction and adhesion of the cutting process, reduce the cutting heat generation.

Although pvd coating exhibits many advantages, but some coatings such as diamond al2o3 and tend to use cvd coating technology. al2o3 is a heat-resistant coating and a very strong antioxidant, heat it can produce the knife cutting concrete and isolate. By cvd coating technology, the advantages of various coatings can also be integrated in order to achieve the best cutting performance, cutting needs. For example: tin with low friction characteristics, can reduce the loss of coating organizations, ticn reduces flank wear, high hardness tic coating, al2o3 coating has excellent insulation effects.