Development of PVD technology
PVD technology was developed in the late 1970s. The prepared films have the advantages of high hardness, low friction coefficient, good wear resistance and chemical stability. The initial successful application in the field of high speed steel tool has attracted the attention of the manufacturing industry all over the world. Compared with the CVD process, the PVD process has a low temperature and has no effect on the bending strength of the tool material when the temperature is below 600℃. The inner stress state of the film is compressive stress, which is more suitable for coating the precision and complex carbide cutting tools. PVD process has no adverse effect on the environment, which is in line with the development direction of modern green manufacturing. At present, PVD coating technology has been widely used in the coating treatment of carbide end milling cutters, drill bits, step drills, oil hole drills, reamers, taps, indexable milling cutters, special-shaped cutters, welding cutters, etc.
PVD technology not only improves the bonding strength of the film with the tool matrix material, but also develops the coating components from the first generation of TiN into multiple composite coatings such as TiC, TiCN, ZrN, CrN, MoS2, TiAlN, TiAlCN, tin-aln, CNX, DLC and ta-c.