TA2表面微弧氧化-水热合成复合陶瓷膜层结构及其表面能分析

Analysis of Structure and Surface Energy of Composite Ceramic Film on TA2 Titanium by Micro-arc Oxidization-Hydrothermal Synt

摘要:

采用微弧氧化-水热法在纯钛TA2表面制备了含有羟基磷灰石、金红石相TiO2及锐钛矿相TiO2的复合陶瓷膜层。实验观测与分析复合陶瓷膜层的微观形貌、元素成分、粗糙度及相组成，探讨水热时间对其结构及表面能的影响。实验与分析结果表明：水热处理后膜层表面结晶形核出大量光滑且较规则的条柱状及针状HA颗粒，膜层表面基本组成元素均为Ti 、O、Ca、P。随着水热时间的延长，膜层表面HA晶粒增多，体积增大，表面粗糙度呈现先下降后上升的趋势。水热初期试样的表面能随其表面粗糙度的减少而呈上升趋势；膜层表面对水的接触角在 116.0°～140.2°之间，均大于纯钛TA2基材对水的接触角77.3°，疏水性能增强；膜层表面能为150.7 mJ?m-2～282.9 mJ?m-2，较纯钛TA2基材的27.5mJ?m-2提高了4倍以上，粗糙度的改变是其主要因素。

Abstract:

Micro-arc oxidation(MAO) and hydrothermal synthesis(HS) methods were used to prepare hydroxyapatite（HA）, rutile and anatase TiO2 composite ceramic film on the surface of TA2 titanium．The experiment observed and analyzed morphology, elemental composition, phase composition and roughness of the film, and explored effect of hydrothermal time on characteristic and surface energy of the ceramic film on the surface of TA2 titanium. The results demonstrated that: after the hydrothermal treatment, large mounts of regular columnar and needle-like HA particles formed on the film, which is mainly consisted of such elements as Ti, O, Ca and P. With hydrothermal time prolonging, the HA particles were increased in number and volume, and surface roughness of the film went down at first, and then went up. At the initial stage of hydrothermal time surface energy of the film showed upward trend with the decrease of surface roughness. The contact angle of water on the film, between 116.0 ° ~ 140.2 °, was larger than that of water on TA2 titanium, which implied that hydrophobicity of the film is enhanced. Compared with TA2 titanium, surface energy of the film which is between 150.7 mJ ? m-2 ~ 282.9 mJ ? m-2, increased more than four times, with the change of its roughness being the major factor.