生物復(fù)合涂層的原位生長(zhǎng)
( 1. 湖南大學(xué) 機(jī)械與汽車工程學(xué)院， 長(zhǎng)沙 410082；
2. 湖南大學(xué) 化學(xué)化工學(xué)院， 長(zhǎng)沙 410082)
摘 要: 先采用PVD法在醫(yī)用鈦金屬表面沉積一層Al膜， 得到Al-Ti基體材料； 而后采用陽(yáng)極氧化與水熱合成復(fù)合制備技術(shù)在Al-Ti基體上成功構(gòu)造了由納米網(wǎng)狀磷酸鹽組成的鈣磷生物陶瓷/Al2O3多孔復(fù)合生物涂層。利用掃描電鏡（SEM）、 透射電鏡（TEM）、 電子能譜（EDAX）、 X射線衍射（XRD）表征了陽(yáng)極氧化前后鋁膜和鈣磷生物陶瓷涂層的微觀形貌、 元素構(gòu)成以及晶相成分。結(jié)果表明： 在陽(yáng)極氧化過(guò)程中， 鈣、 磷元素嵌入陽(yáng)極氧化鋁（AAO）膜，并經(jīng)水熱處理反應(yīng)原位生成鈣磷陶瓷； 鈣磷陶瓷晶體從Al2O3孔洞長(zhǎng)出并覆蓋于多孔氧化膜的表面；最終獲得的鈣磷生物陶瓷/多孔Al2O3復(fù)合涂層具有納米網(wǎng)狀、多孔的結(jié)構(gòu)特征。 分析探討了鈣磷生物陶瓷/多孔Al2O3復(fù)合涂層的原位生長(zhǎng)過(guò)程，濃度梯度與電位差分別是Ca、 P元素進(jìn)入AAO膜的主要推動(dòng)力。
關(guān)鍵字: 磷酸鈣； 鈦基體； 陽(yáng)極氧化； PVD； 水熱處理； 生物復(fù)合材料
Al2O3 biocomposite coating on Al-Ti substrate
（ 1. College of Mechanical and Automotive Engineering,
Hunan University, Changsha 410082, China;
2. College of Chemistry and Chemical Engineering,
Hunan University, Changsha 410082, China）
Abstract: Pure Al thin film was PVD-deposited on medical titanium to form Al-Ti substrate. Al-Ti substrate was then applied to the hybrid technique of anodization and hydrothermal treatment, which finally led to the successful fabrication of nanometric network calcium phosphate/porous Al2O3 biocomposite coating on Al-Ti substrate. Scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy-dispersive X-ray analysis(EDAX) and X-ray diffraction(XRD) were employed to study the microstructures and compositions of Al thin film and calcium phosphate/porous Al2O3 biocomposite coating. The results indicate that the Ca and P ions are incorporated into the anodized alumium oxide(AAO) during the anodization process, and the incorporated Ca and P are reacted to be calcium phosphate after hydrothermal treatment. The calcium phosphate grows from the holes of AAO and covers the surface of AAO layer. In addition, the mechanism for the in-situ growth process of calcium phosphate/porous Al2O3 biocomposite coating was discussed. The concentration gradient and potential difference contribute to the incorporation of Ca and P into AAO film, respectively.
Key words: calcium phosphate; Ti substrate; anodization; PVD; hydrothermal treatment; biocomposite
