Investigation of PVD coatings deposited on the Si3N4 and sialon tool ceramics
D. Pakua,L. A. Dobrzanski,A. Kriz
Archives of Materials Science and Engineering
Abstract
Purpose: The paper presents investigation results of the structure and properties of the coatings deposited by cathodic arc evaporation - physical vapour deposition (CAE-PVD) techniques on the Si3N4 and sialon tool ceramics. The Ti(B, N), Ti(C, N), (Ti, Zr)N and (Ti, Al)N coatings were investigated. Design/methodology/approach: The structural investigation includes the metallographic analysis on the scanning electron microscope. Examinations of the chemical compositions of the deposited coatings...More were carried out using the X-ray energy dispersive spectrograph EDS and using the X-ray diffractometer. The investigation includes also analysis of the mechanical and functional properties of the material: microhardness tests of the deposited coatings, surface roughness tests, evaluation of the adhesion of the deposited coatings. Findings: Deposition of the multicomponent gradient coatings with the PVD method, based on the B, Al and Zr solid secondary solution in the TiN titanium nitride, isomorphous with the alternating pure titanium nitride TiN, on tools made from nitride ceramics and sialon's ceramics, results in the increase of mechanical properties in comparison with uncoated tool materials, deciding thus the improvement of their working properties. Research limitations/implications: Ti(B, N), Ti(C, N), (Ti, Zr)N and (Ti, Al)N multicomponent and gradient coatings can be applied for cutting ceramic tools. Originality/value: Comparison of the wide range of modern sintered tool materials with wide unique set of PVD coatings.
keywords:Thin & thick coatings; PVD; Si3N4; SIALON
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