纯钛表面微弧氧化和水热处理的研究

Study of Micro-arc Oxidation and Hydrothermal Treatment on the Surface of Pure Titanium

在电压400 V下对钛试样进行微弧氧化(MAO)处理,之后再分组进行水热处理0、4、8和12 h,用扫描电镜观察试样表面形貌,内置能谱仪分析表面元素组成,X射线衍射仪分析表面的晶相,手持式粗糙度仪检测表面粗糙度。结果发现MAO处理后,试样表面出现蜂窝状的多孔结构,孔呈火山口状;其氧化膜组成主要是金红石型二氧化钛和锐钛矿型二氧化钛。水热处理的表面生成更多晶体,其组成元素主要是Ti、Ca、P和O;水热处理12 h的膜层的钙磷比与骨的接近,X射线衍射图谱也提示随水热处理时间的延长,HA生成量增多。MAO处理组前后粗糙度有统计学差异,而不同水热处理时间组,粗糙度没有统计学差异。

After micro-arc oxidation （MAO）, the titanium samples were undergone the hydrothermal treatment for 0, 4, 8 and 12 h, respectively. The compositions and images of coatings were analyzed using scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The surface roughness of each sample was also analyzed. The results showed that after micro-arc oxidation, the honeycomb-shaped vesicular structures and the shapes of crater holes were observed on the surfaces. The oxidation film was composed of the rutile and the anatase. After the hydrothermal treatment, the crystals appeared on the surfaces, in which the composition elements were mainly Ti, Ca, P and O. After hydrothermal treatment for 12 h, the Ca/P mol ratio of the film was in close to that of the bone. And the HA content of the coatings increased with increasing of the treatment time. Before and after MAO treatment, the roughness showed statistic difference, but among the groups with different hydrothermal treatment time, there was no statistic difference in roughness.