Effect of nitrogen pressure on Ti /TiA1 coating on 304 stainless steel by PVD-DC magnetron sputtering

Abstract

In recent years, for hard coating material studies it was focused on particular coated components for drilling bit and cutting tools such as end mulls, drills and cutting inserts. Titanium nitride (TiN), which is widely used as a hard coating material, was coating on 304 stainless steel substrate materials, because of excellent properties such as adhesion to substrates, high chemical inertness, resistance to elevated temperatures, hard surface (2400 HV) and low By comparison, TiAlN can significantly increase tool lifetime, therefore, it can reduce machine downtime and increases in productivity. In this study, Physical Vapour Deposition method (DC reactive Magnetron Sputtering) was used. This method is widely used for depositing hard coatings on subtract for tool applications. The effect of nitrogen pressure during deposition on microstructure, surface roughness and wear behavior of coating film for both targets was studied. The results FESEM analysis showed columnar structures were formed for both types of coating with thickness of 826.3 nm. From XRD analysis, for TiN the dominant growth plane is (111), whereas for TiAlN is (200). From three-dimensional AFM analysis it was indicated that surface roughness will increase as the N2 pressure increase. From multi pass scratch test analysis it was showed that the lowest friction and better wear resistance is at N2 pressure of 10sccm and 8sccm for TiN and TiAlN respectively. Friction coefficient of friction TiN shows limited oxidation resistance and may start to oxidize at temperature above 500 , therefore TiAlN become an alternative because it can be withstand at extreme temperature up to 800