Electrolytic deposition of hydroxyapatite coating on thermal treated Ti-40Zr |
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| Authors: | Hsueh-Chuan Hsu Shih-Ching Wu Chih-Hung Lin Wen-Fu Ho |
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| Affiliation: | (1) Department of Dental Laboratory Technology, Central Taiwan University of Science and Technology, Taichung, Taiwan, ROC;(2) Institute of Biomedical Engineering and Material Science, Central Taiwan University of Science and Technology, Taichung, Taiwan, ROC;(3) Department of Mechanical and Automation Engineering, Da-Yeh University, Changhua, Taiwan, ROC;(4) Department of Materials Science and Engineering, Da-Yeh University, No. 112, Shanjiao Rd., Dacun, Changhua, 51591, Taiwan, ROC |
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| Abstract: | In this study, hydroxyapatite (HA) was coated on both thermal treated and untreated Ti-40Zr substrates by means of electrolytic
deposition. It was predicted that the HA layer would increase the bioactivity and osteoconductivity of the Ti-40Zr substrate,
and a thermal treatment would improve the bonding strength between the HA layer and Ti-40Zr substrate, and prevent the corrosion
of the Ti-40Zr substrate. First, the Ti-40Zr samples were annealed at various temperatures (200, 300, 400, 500 and 600°C respectively).
After annealing, samples were immersed in a Ca(NO3)2 · 4H2O and (NH4)3PO4 · 3H2O solution for the electrolytic deposition of the HA coating. Various analyses of the coating were conducted, including surface
morphology, phase structure, corrosion resistance, biocompatibility, and bond strength between HA and Ti-40Zr. Experimental
results indicated that the bonding strength of the HA coating on the thermal treated Ti-40Zr was markedly improved when compared
to that of the HA coating on an untreated Ti-40Zr alloy. The corrosion resistance of Ti-40Zr was also improved by the use
of the thermal treatment, as shown by a potentiodynamic polarization test. Finally, osteoblast-like cells cultured on the
HA coating surface were found to have proliferated on all samples. |
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