(1. 湖南大學(xué) 機(jī)械與汽車工程學(xué)院, 長沙 410082;
2. 湖南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410082)
摘 要: 采用物理氣相沉積（PVD）與陽極氧化與電沉積相結(jié)合的復(fù)合技術(shù)在Si基表面制備了羥基磷灰石（HA）/Al2O3復(fù)合生物涂層。采用SEM研究了陽極氧化Al2O3和HA/Al2O3復(fù)合生物涂層的形貌, 并采用EDS與XRD研究了HA/Al2O3復(fù)合生物涂層的組成和物相。結(jié)果表明： 擴(kuò)孔處理后陽極氧化的Al2O3孔徑約為1.5~3.0 μm, 電沉積HA的n(Ca)/n(P)約為1.61, 最終獲得了以HA為外層、 HA/Al2O3為中間過渡層、 Si為基底的復(fù)合材料。其中, HA不僅沉積于陽極氧化Al2O3的孔洞中, 且外延生長并覆蓋在陽極氧化Al2O3表面, 從而在HA外層與HA/Al2O3中間過渡層之間形成了一種T形分布的結(jié)構(gòu)特征, 該結(jié)構(gòu)特征將有助于增強(qiáng)HA外層與中間過渡層的界面結(jié)合強(qiáng)度。
關(guān)鍵字: 羥基磷灰石/Al2O3；生物活性涂層； 陽極氧化； 電沉積
（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
