Preparation of porous hydroxyapatite thin film on titanium metal substrate by sol-gel process.

Abstract

Hydroxyapatite (HAp: Ca₁₀(PO₄)₆(OH)₂ thin films having porous structure were prepared by sol-gel process with dip-coating using calcium acetate (Ca(CH₃COO)₂·H₂O) and triethylene phosphate.
In the present study, the surface of titanium metal was coated with a sodium-titanium oxide layer by sol-gel process treatment with alkali hydroxide solutions. HAp thin film prepared on modified titanium substrate was then obtained at 800°C (under transformation point of titanium metal) so at lower temperature than previous process. Peeling of HAp thin film was prevent by the formation of sodium-titanium oxide layer. Calcium oxide free HAp films were synthesized with acetate as a raw materials of calcium and rapid heating at 800°C for 1 hr. The films were chemically bonded to the substrate and had a porous structure which was expected to show a good bioactivity.