Zhang H, Li S
Biomaterials and Engineering Center, Wuhan University of Technology, PR China.
Biomed Mater Eng. 2000;10(3-4):205-12.
Hydrothermal method was used to prepare the hydroxyapatite (HA) coating on CaO-SiO2-B2O3-Na2O glass. The phase composition, morphology and microstructure of HA coated glass composites were analyzed using XRD, EPMA, FT-IR and SEM techniques. It revealed that HA coating possessed a porous gradient construction; HA coating was tightly bonded with the glass substrate by the interface layer. During the formation of HA coating, the hydrated silica produced by the corrosion of glass substrate in the hydrothermal solution provided favorable sites for apatite nucleation. With the dissolving of HA powder and the growth of apatite small crystallites, Ca+, PO(4 (3-)) ions would precipitate on the surface of glass to form the HA coating. Silicon element released from glass reacted with calcium produced by the dissolution of HA to form the tight reaction layer. HA coating is formed by the mechanism of dissolving-ions immigrating-precipitating pattern.
采用水热法在CaO-SiO2-B2O3-Na2O玻璃上制备羟基磷灰石（HA）涂层。利用XRD、EPMA、FT-IR和SEM技术分析了HA涂层玻璃复合材料的相组成、形貌和微观结构。结果表明，HA涂层具有多孔梯度结构；HA涂层通过界面层与玻璃基体紧密结合。在HA涂层形成过程中，玻璃基体在水热溶液中腐蚀产生的水合二氧化硅为磷灰石成核提供了有利位点。随着HA粉末的溶解和磷灰石小晶粒的生长，Ca+、PO(4 (3-))离子会在玻璃表面沉淀形成HA涂层。玻璃释放出的硅元素与HA溶解产生的钙反应形成致密的反应层。HA涂层是通过溶解-离子迁移-沉淀模式形成的。
