Resumo

BERMUDEZ-REYES, B. et al. Chemical anchorage of Hydroxyapatite on 316LSS using a ZrO₂ interlayer for orthopedic prosthesis applications. Superf. vacío [online]. 2012, vol.25, n.3, pp.150-156. ISSN 1665-3521.

The aim of this work is the study of the interaction mechanisms between hydroxyapatite-zirconia interface and the zirconia layer (ZrO₂) on a stainless steel substrate in the HA/ZrO₂/316LSS system. The Hydroxyapatite (HA) layer was applied by the screen printing technique on ZrO₂ film previously deposited by electrophoresis on 316LSS substrates. The bilayer system was thermally annealed at temperatures less than or equal to 700 °C for a maximum time of 5 minutes. The electro-deposited amorphous layers of zirconium hydroxide with a thickness about 8 µm showed good adherence to the stainless steel substrates and allowed good chemical anchorage with the HA layer after the thermal treatment, producing a thin layer of zirconia stabilized in tetragonal and monoclinic mixed phases. The thermal treatment also degraded HA layer to form calcium phosphates. The bilayer system of HA/ZrO₂ on 316LSS substrate ensures a good anchorage, being a good and inexpensive candidate for a protective coating in stainless steel orthopedic prostheses. This solves the low adherence between HA and 316LSS, in addition of the low cost the 316LSS prostheses as a biocompatible system with low production costs.

Palavras-chave : Hydroxyapatite; Zirconia; Biomaterials; Bilayer coating system.

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