Hardness Evaluation of Porous Hydroxyapatite Coating

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract--The extensive use of appropriate coatings to improve wear resistance, friction coefficient, electrical properties, corrosion resistance and biomedical application has stimulated a growing interest in their mechanical properties and especially hardness testing that is routinely used for coating evaluation. In this study Jönsson and Hogmark model is applied for the porous hydroxyapatite produced by plasma spraying on Ti6A14V substrate. Firstly, the effect of indentation load on hardness values of coating and substrate are studied. The modified Jönsson and Hogmark model is used to explain the composite hardness behavior and the effect of coating porosity.

Mechanical Behavior Study of Plasma Sprayed Hydroxyapatite Coatings onto Ti6Al4V Substrates Using Scratch Test

“…Microstructure. In a preliminary study, the X-ray diffraction reveals that HAP is the principal phase of coatings [8]. SEM observations of the plasma-sprayed coatings reveal typical features presented in numerous other studies [13][14][15][16][17].…”

“…Two substrate surfaces with arithmetic average roughness parameters R a equal to 2.29 µm and 1.23 µm were respectively studied. Absolute hardness was respectively 233 VH for the substrate and 209 VH for a 120 µm thick coating [8]. Microstructure of coatings was studied by X-ray diffraction and secondary electron microscopy (SEM).…”