Characteristics of Ti(C,N) and (Ti,Zr)N gradient PVD coatings deposited onto sintered tool materials

Purpose: The purpose of this paper is the characterisation of Ti(C,N) and (Ti,Zr)N thin films produced by cathode arc evaporation physical vapour deposition (CAE-PVD) method onto sintered carbides and sialon tool ceramics. Design/methodology/approach: The GDOS spectrometer was used to indicated chemical concentration changes of the coating components. The phase composition of the investigated coatings was determined by means of the X-ray diffractometer: standard and grazing incidence X-ray diffraction methods. Observations of surface topography and fractures of the deposited coatings were carried out in the scanning electron microscope. Tests of the coatings adhesion to the substrate material were made by use of the scratch test. The microhardness of substrates and coatings were measured by Vickers method. Cutting ability was determined by technological cutting trials. Findings: The studied PVD gradient coatings deposited by cathodic arc evaporation method are demonstrated high hardness, adhesion and wear resistance. The critical load LC2, which is in the range 21-53 N, depends on both the coating type and material substrate. Coatings deposited on sintered carbides are extending tools life. Practical implications: Ti(C,N) and (Ti,Zr)N gradient coatings can be applied for cutting tools. Originality/value: It should be emphasized, that the mechanical properties of the PVD coatings described in this work are very encouraging and therefore their application for products manufacturing at mass scale is possible in all cases where reliable, very hard and abrasion resistant coatings, deposited onto sintered tools substrate are required.