| Summary: | 碩士 === 國立聯合大學 === 機械工程學系碩士班 === 102 === Hydroxyapatite (HAp) is a bioactive ceramic with chemical composition close to the composition of the human skeleton. Many research attempt to deposit HAp on surface of titanium metals to replace artificial dental implants and artificial joints in single process. this paper, barium titanate was synthesized by Plasma Electrolytic Oxidation (PEO) method . The experimental results shows that electrolyte composition, pH, and ultrasonic vibration have profound influence in HAp synthesis. The electrolytes are the mixture of calcium acetate (Ca (CH3COO) 2.H2O), sodium dihydrogen phosphate (NaH2PO4) and sodium hydroxide (NaOH). This study result showed that the concentration ratio of calcium/sodium dihydrogen phosphate affect . The larger of the ratio, the large of the C/P ratio. The optimal process parameters of electrolyte concentration are to use 0.2 M calcium acetate and 0.1 M sodium dihydrogen phosphate, applying voltage 430 V under 10 minutes. pH also influenced the synthesis.in acid environment.The formed phase is CaTiO3 and TiO2, while in alkaline solution it formed single phase HAp.
Ultrasonic vibration also make significantly contributions on increasing the film thickness, surface roughness and micro hardness. The corrosion potential Ecorr and Icorr demonstrate the improved corrosion rate by deposition of HAp.
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