Electrolytic deposition of fluorine-doped hydroxyapatite/ZrO₂ films on titanium for biomedical applications

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• 作者：Yong Huang^a ; Yajing Yan^a ; Xiaofeng Pang^a ; ^b ; ^{pangxf2006@yahoo.com.cn}
• 关键词：C. Corrosion ; D. Apatite ; D. ZrO2 ; E. Biomedical applications
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：39
• 期：1
• 页码：245-253
• 全文大小：1187 K

文摘

A novel method of electrolytic fluorine-doped hydroxyapatite/ZrO₂ double-layer coating was conducted on medical titanium in ZrO(NO₃)₂ aqueous solution and subsequently in the mixed solution of Ca(NO₃)₂, NH₄H₂PO₄ and NaF. The microstructure, phase composition, bond strength, dissolution rate and corrosion resistance of the films were studied. Results revealed that the additions of F^? reduced the crystallite and increased the crystallinity of hydroxyapatite, structure of apatite was changed from micro-petal-like crystals to nano-needle-like crystals, which aligned vertically to the substrate. The approximately 10 ¦Ìm thick layers was much denser and uniform. Addition of ZrO₂ buffer layer could improve the bond strength between the fluorine-doped hydroxyapatite layer and the substrate. The bond strength of the double-layer coating was found to be significantly higher than that of pure hydroxyapatite coating even after soaking in normal saline for two weeks. In physiological solution, the double-layer coating showed lower dissolution rate and stronger corrosion resistance than pure hydroxyapatite coating.