(1. 華中科技大學(xué) 材料成形與模具技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，武漢 430074；
2. 北京大學(xué) 工學(xué)院, 北京 100871)
摘 要: 在乙酸鈣−磷酸二氫鈣電解液中添加硝酸鑭，對(duì)純鈦進(jìn)行微弧氧化處理，利用XRD、SEM和EDX分別研究了La元素對(duì)膜層形貌、成分、物相的影響及作用機(jī)制，并利用細(xì)胞接種方法研究膜層的生物活性。結(jié)果表明：電解液中添加La降低膜層厚度，增加膜層孔洞尺寸，抑制銳鈦礦向金紅石型轉(zhuǎn)變，并在微弧氧化過程中具有促進(jìn)羥基磷灰石HA形成的能力。煅燒處理使膜層中的非晶HA晶化，形成片狀和鱗狀的HA晶體；膜層經(jīng)煅燒后形成的HA/TiO2復(fù)合膜具有良好的細(xì)胞相容性。
關(guān)鍵字: La; 純鈦；微弧氧化；羥基磷灰石; 細(xì)胞相容
pure Ti micro-arc oxidation coatings
（1. State Key Laboratory of Material Processing and Die and Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China;
2. College of Engineering, Peking University, Beijing 100871, China）
Abstract:Ca(CH3COO)2∙H2O-Ca(H2PO4)∙H2O electrolyte system with La(NO3)3∙6H2O was used to carry out micro-arc oxidation treatment on pure titanium. By means of XRD, SEM and EDX, the effects of La on morphologies, phases and compositions of coatings gained from the electrolyte were investigated. The cell culture method was used to study the cyto-compatibility of the coating. The results show that the coatings formed in electrolyte with La are thinner and have larger pores than those formed in electrolyte without La. Addition of La can inhibit the transition from anatase to rutile and has stronger capability of inducing HA. After being sintered, the amorphous hydroxyapatite (HA) in coatings is crystallized into flake or scaly. The new coatings after being sintered with HA/TiO2 are proved to have good biocompatibility.
Key words: La; pure titanium; micro-arc oxidation; hydroxyapatite; ayto-compatibility
