The mechanical properties of PVD coatings deposited on nitrided CoCrMo alloy
Journal Title: Tribologia - Year 2010, Vol 231, Issue 3
Abstract
The paper concerns the evaluation of mechanical properties of the composite: ‘nitrided layer-PAPVD coating’ created on CoCrMo alloy intended for biotribological applications.<br/><br/>Five nitriding processes with varying nitriding potential (p(N2/H2) =1.0, 1.5, 2.0, 2.5 and 3.0) were selected for optimising. The modulus of elasticity and nanohardness of nitrided layers were measured by nanoindentation. Cross-sections were examined by means of scanning electron microscopy (SEM) in order to determine the thickness and the uniformity of the affected zone after nitriding. The change in surface roughness was studied with the help of 3D roughness parameters obtained by atomic force microscopy (AFM) and the phase composition was determined by means of X-ray diffraction (XRD). It was found that the most suitable properties of the surface layer were achieved by nitriding at p(N2/H2) = 2.5.<br/><br/>CrN as well as multilayer (TiN/CrN)x3 PAPVD coatings were deposited onto the substrates with and without nitiriding for evaluation of the nitriding effect on the adhesion. CoCrMo alloy nitrided sample was included for comparison. All these conditions were characterised by means of AFM, nanohardness, SEM, and scratch test.<br/><br/>The duplex technology applied to CoCrMo orthopaedic alloy allows for a significant increase of the adhesion of the PAPVD coatings and the improvement of the load carrying capacity of the CoCrMo orthopaedic alloy.<br/><br/>
Authors and Affiliations
Javier A. Ortega-Saenz, Marco A. L. Hernandez-Rodriguez, Remigiusz Michalczewski, Jerzy Smolik, Marian Szczerek
Keywords
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