A PARAMETRIC STUDY OF THE MICROSTRUCTURAL, MECHANICAL AND TRIBOLOGICAL PROPERTIES OF PACVD TIN COATINGS

In order to design coatings with optimal wear and corrosion performanc e, knowledge of the structures and properties of the coatings and thei r dependence on the process parameters is required. Coatings of TiN de posited onto tool steels using an industrial, pulsed DC plasma-assiste d chemical vapour deposition chamber were investigated. The process pa rameters, i.e, voltage, pressure, and flows of H-2, Ar, N, and TiCl4, were varied. The microstructural, mechanical and tribological properti es of the coatings were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nanoindentatio n, pin-on-disc measurements and Rutherford backscattering spectrometry . The residual stress level and hardness varied significantly with cha nges in the process parameters, whereas the tribological properties di splayed only minor variations. (C) 1998 Elsevier Science S.A.