Effect of Bioceramic Coating Materials on Surface Hardness, Morphology and Coating Thickness

Abstract

Stainless steel Rex-734 biomedical alloy (ASTM F1586) can be used as a new functional implant material with its extra ordinary corrosion resistance and material properties. In order to functionalize such material, Single Hydroxyapatite(HA) (S₁),  Hydroxyapatite-SiO₂ (S₂), Hydroxyapatite-Ag (S₃) and Hydroxyapatite/Zr (S₄) dip coatings were executed on Rex-734 implant alloy. Different coating thicknesses for S₁, S₂, S₃ and S₄ groups were obtained 12.4, 10.9, 11.1 and 10.3 µm, respectively. From the morphologic SEM views, the better and crack free coating surfaces were found for HA/Zr (S₄) group. The average hardness values for single HA coatings were found to be 290 HV.  In comparison with single coatings, HA/SiO₂ coatings caused lower hardness (261 HV) and higher values (312 HV) for HA/Ag double coatings, however, highest hardness was obtained (353 HV) for HA/Zr coatings. 

Keywords

• Hydroxyapatite,REX-734,Silica,Silver,Sol-gel,Zr

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