| PENG Chao,ZHAO Xiao-bing.Microstructures and In vitro Biomineralization Ability of Plasma-sprayed TiO2-CaF2 Composite Coatings[J],46(5):127-132 |
| Microstructures and In vitro Biomineralization Ability of Plasma-sprayed TiO2-CaF2 Composite Coatings |
| Received:December 06, 2016 Revised:May 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.05.022 |
| KeyWord:plasma spraying composite coating implants mineralization surface morphology biology |
| Author | Institution |
| PENG Chao |
School of Materials Science and Engineering, Changzhou University, Changzhou , china |
| ZHAO Xiao-bing |
School of Materials Science and Engineering, Changzhou University, Changzhou , china |
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| Abstract: |
| Titanium oxide (TiO2) coating is a bioinert material and cannot induce new bone formation at the implant surface. The work aims to enhance in-vitro biomineralization ability of TiO2 coating by preparing TiO2-CaF2 composite coating. TiO2-CaF2 composite coating was deposited on medical titanium alloy by taking advantage of plasma spraying technology. Scanning electron microscopy (SEM), X-ray diffractometer (XRD) and Raman spectrometer were used to characterize microstructure of the composite coating. Contact angle, surface roughness and corrosion resistance of the coating were measured by contact angle meter, surface profiler and electrochemical workstation, respectively. Simulated body fluid (SBF) immersion test was performed to evaluate in-vitro biomineralization ability of the coating. Phase composition of the coating was mainly rutile, including few anatase. The doping of 20wt% CaF2 could promote formation of rutile TiO2. The addition of CaF2 could change surface morphology of the TiO2 coating, reduce surface roughness (Ra) from 4.96 μm to 0.94 μm, and enhance hydrophily. Corrosion resistance of the TiO2-CaF2 composite coating in SBF was higher than that of TiO2 coating. After being immersed in SBF for 28 days, the surface of TiO2-CaF2 composite coating could induce the bone-like apatite while exhibiting excellent in-vitro biomineralization ability while the TiO2 coating could not. The addition of CaF2 can decrease the surface roughness of TiO2 coating, and enhance the hydrophilicity and corrosion resistance. The bone-like apatite can deposit on the surface of TiO2-CaF2 composite coating, exhibiting excellent in-vitro biomineralization ability. |
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