Physical vapor deposition and chemical vapor deposition method similar to, but physical vapor deposition is performed at about 500 ℃. Physical vapor deposition method initially applied to the high-speed steel, carbide cutting tools used in later on. Chemical vapor deposition method are mostly multi-layer coating, and physical vapor deposition rule may be a single coating and multilayer coating. pvd law have occurred arc plasma vapor deposition, plasma emission gun electron beam ion plating method, hollow cathode emission gun electron beam ion plating method, e-shaped emission gun electron beam ion plating method, etc., have their own characteristics and advantages and disadvantages. Recent advances pvd particularly striking, multiple processes competing to launch a variety of diverse, multi-layer composite coatings with different functions, which greatly expanded the scope of application of the coating, the coating of new varieties developed significantly faster, with the gradient structure, the development of nano-structured coatings, coating performance achieved new breakthroughs.

Coated carbide tools has the following advantages: (1) the surface of the coating material with high hardness and wear resistance, if compared with the uncoated carbide, carbide coating allows the use of higher cutting speed, thereby improving the processing efficiency, or can greatly improve tool life at the same cutting speed. (2) the coating material and the coefficient of friction between the material to be processed is small, if compared with uncoated cemented carbide, coated carbide cutting forces have a reduced, preferably machined surface quality. (3) Due to the good overall performance, coated carbide tools have better versatility and wide range of applications. Carbide coating method is the most commonly used high-temperature chemical vapor deposition (htcvd), by plasma chemical vapor deposition method (pcvd) in the cemented carbide surface is coated with the coating process has been applied.