用于生物医学应用的钛合金上CaTiO3/TiO2复合涂层的形成
Formation of CaTiO3/TiO2 composite coating on titanium alloy for biomedical applications.
作者信息
Wei Daqing, Zhou Yu, Jia Dechang, Wang Yaming
机构信息
Institute for Advanced Ceramics, Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
出版信息
J Biomed Mater Res B Appl Biomater. 2008 Feb;84(2):444-51. doi: 10.1002/jbm.b.30890.
Plasma electrochemical oxidation (PEO) was used to prepare TiO2-based coating containing Ca and P on titanium alloy. After alkali- and then heat-treatment at 800 degrees C of the PEO coating, a CaTiO3/TiO2 composite (CTC) coating was obtained. The current results indicate that the apatite-forming ability of the CTC coating is higher than that of the PEO coating. During the simulated body fluid (SBF) incubation, Ca of the CTC coating is released into the SBF. An ionic exchange between Ca(2+) ions of the CTC coating and H(3)O(+) ions of the SBF may take place during the SBF incubation. As a result, the abundant Ti--OH groups are formed on the surface of the CTC coating. The hydroxyl functionalized surface greatly enhances the nucleation and growth of apatite, leading to the high apatite-forming ability of the CTC coating. The apatite induced by the CTC coating exhibits a porous and carbonated structure.
采用等离子体电化学氧化（PEO）法在钛合金表面制备含Ca和P的TiO₂基涂层。对PEO涂层进行碱处理后再在800℃下进行热处理，得到CaTiO₃/TiO₂复合（CTC）涂层。当前结果表明，CTC涂层的磷灰石形成能力高于PEO涂层。在模拟体液（SBF）浸泡过程中，CTC涂层中的Ca释放到SBF中。在SBF浸泡过程中，CTC涂层中的Ca²⁺离子与SBF中的H₃O⁺离子之间可能发生离子交换。结果，在CTC涂层表面形成了大量的Ti-OH基团。羟基官能化表面极大地促进了磷灰石的成核和生长，导致CTC涂层具有高磷灰石形成能力。CTC涂层诱导形成的磷灰石呈现出多孔和碳酸化结构。
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