(1. 湖南大学 机械与汽车工程学院, 长沙 410082;
2. 湖南大学 材料科学与工程学院, 长沙 410082)
摘 要: 采用物理气相沉积（PVD）与阳极氧化与电沉积相结合的复合技术在Si基表面制备了羟基磷灰石（HA）/Al2O3复合生物涂层。采用SEM研究了阳极氧化Al2O3和HA/Al2O3复合生物涂层的形貌, 并采用EDS与XRD研究了HA/Al2O3复合生物涂层的组成和物相。结果表明： 扩孔处理后阳极氧化的Al2O3孔径约为1.5~3.0 μm, 电沉积HA的n(Ca)/n(P)约为1.61, 最终获得了以HA为外层、 HA/Al2O3为中间过渡层、 Si为基底的复合材料。其中, HA不仅沉积于阳极氧化Al2O3的孔洞中, 且外延生长并覆盖在阳极氧化Al2O3表面, 从而在HA外层与HA/Al2O3中间过渡层之间形成了一种T形分布的结构特征, 该结构特征将有助于增强HA外层与中间过渡层的界面结合强度。
关键字: 羟基磷灰石/Al2O3；生物活性涂层； 阳极氧化； 电沉积
（1. College of Mechanical and Automotive Engineering,
Hunan University, Changsha 410082, China;
2. College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: The bioactive coating of hydroxyapatite/Al2O3 on Si substrate was fabricated by a hybrid technique of physical vapor deposition (PVD), anodization and electro-deposition. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD) were employed to investigate the morphologies, composition and phases of anodic Al2O3 and HA/Al2O3 composite coating. The results show that the porous anodic Al2O3 （the intermediate layer）with pores of 1.5~3.0 μm is obtained after the anodization and subsequent pore widen process. The hydroxyapatite coating （top layer）is electrodeposited into the holes of anodic Al2O3 and onto the surface of anodic Al2O3. The mole ratio of Ca and P of hydroxyapatite coating is 1.61. The distribution of HA in HA/Al2O3-Si composite exhibits a feature of T shape structure, which will be beneficial to improve the bonding strength between the HA top layer and the HA/Al2O3 intermediate layer.
Key words: hydroxyapatite/Al2O3; bioactive coating; anodization; electrodeposition
