A review paper on Vapour deposition coating

Vishakha S. Pahade, Pankaj S. Chavan, Vaishali P. Baisane

With the demands of lower cost, higher accuracy, better surface finish, and shorter process time in the precision engineering industry, high-speed machining of high hardness materials including hardened tool steels has become increasingly important. To improve the performance and to extend the life of the cutting tools, various types of vapour deposition coatings have been developed. Vapour deposition coatings for high-speed machining consist of multiple layers because of the requirements for high-adhesion strength to the substrate, high-thermal stability, high hardness, a low-friction coefficient, and good compatibility. The present techniques used to produce these coatings include physical-vapour deposition (PVD), and chemical vapour deposition (CVD).Traditionally used coatings like TiN, CrN, and their alloyed nitride coatings, have high hardness and good adhesion strength on common materials used in the tooling industry. However, these coatings have poor performance in high-speed machining applications, especially in the cutting of hardened tool steels, because of phase transition (oxidation) at high temperature. This research work gives the introduction about PVD and CVD.