摘要
对钛合金表面进行阳极氧化预处理,然后用水热电化学方法在其上沉积羟基磷灰石-二氧化钛(HA-TiO2)复合涂层,研究了阳极电压对基体表面的物相、形貌、润湿性和粗糙度的影响,以及对HA的物相、形貌及生物活性的影响。结果表明:阳极氧化电压高于110 V时在钛基体表面出现金红石型和锐钛矿型TiO2,孔径尺寸随阳极电压的增加而增大。在120 V预处理的钛合金试样表面具有好的润湿性,粗糙度Ra达到0.56μm。HA涂层沿c轴方向择优生长,并呈现分层生长,HA的结晶度随着阳极氧化电压的提高先增大后减小,在120 V取得最大值。在120 V氧化处理的试样具有较好的生物活性。
Ti6Al4V substrate was pretreated by anodic oxidation and then hydroxyapatite coatings were deposited on the oxidized titanium surface by hydrothermal- electrochemical method. The effect of oxidation voltage on the phase composition, surface morphology, wettability and roughness of anodic films, as well as on the phase composition, micro-morphology and bioactivity of HA coatings were investigated. The results show that: after anodic oxidation the titanium alloy is covered by TiO2 porous oxide film consisted of rutile and anatase when the voltage is higher than 110 V. The pore size of the titania layer increases with the increase of the anodic voltage and the alloy after anodic oxidation by 120 V has good wettability and the roughness is about Ra=0.56 μm. The HA coatings formed by hydrothermal-electrochemical deposition exhibits a layered structure with a preferential orientation(002) for several of oxidation voltage. The crystallinity of HA increases with anodic oxidation voltage up to 120 V and then decreases. The hydroxyapatite-TiO2 coating deposited on the alloy which had been anodic-oxidized by 120 V has better bioactivity.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2014年第12期887-894,共8页
Chinese Journal of Materials Research
基金
中国科学院特种无机涂层重点实验室开放课题项目KLICM-2014-11
上海市自然科学基金15ZR1428300资助~~
