在多孔钙磷陶瓷表面浸涂溶胶制备HA涂层

Synthesis of hydroxyapatite coating on porous calcium phosphate ceramic by dipping HA sol

采用有机泡沫浸渍工艺制备了具有高孔隙率的多孔钙磷陶瓷,并以此为基体,采用浸涂溶胶的方法在多孔陶瓷网架结构表面成功制备了HA涂层.扫描电镜(SEM)观察样品的孔隙和表面形貌显示,涂层均匀涂敷在多孔陶瓷孔壁表面,形成的涂层中存在着大量由于水分蒸发形成的缩孔.涂层处理对样品的大孔结构没有明显影响,样品仍保持了较高的孔隙率(82.3%±2.8%).X射线衍射(XRD)分析表明,涂层由较纯的HA组成.经不同温度处理后,HA涂层呈现了不同的结晶状态.500℃处理后得到了结晶程度较低的HA涂层,这种涂层有利于提高多孔陶瓷的表面生物活性.对涂层与基体的界面分析后可得,两者之间为紧密的机械锚合.

Hydroxyaptite （HA） Ca10 （PO4）6 （OH）2 was successfully coated on a highly porous substrate of calcium phosphate ceramic fabricated by the technique of foam impregnation. The pore structure and surface morphology of the samples were characterized by manning electron microscopy （SEM）. The results indicate that the coating is microstructurally uniform on the pore walls of porous ceramic, and there are a large amount of micropores formed in the coating due to the evaporating of water and solvent. The coating has no remarkable effect on the macropore structure of samples, so the samples after coating maintain a high porosity （82. 3% ±2. 8% ）. X ray diffraction indicates that the coating is essentially composed of pure HA. Moreover, the HA coating sintered at different temperature has different degree of crystallinity. The HA coating treated at 500 ℃ shows a low degree of crystallinity, which would improve the surface bioactivity of the porous ceramics. The analysis of the interface shows that the coating adheres on substrate compactly by mechanical mode.