时间参数对复合氧化法制备多孔二氧化钛涂层结构的影响

The Effect of Micro-Arc Oxidation Time on the Structure of the Porous Titania Films Prepared by a Composite Oxidation

为了分析微弧氧化时间对复合氧化法(即预氧化和微弧氧化复合法)制备的二氧化钛涂层结构和形貌的影响,采用X射线衍射、SEM及附带的能谱(EDS)对涂层的结构、形貌和元素组成进行了分析,采用MH-3型硬度计对涂层表面的硬度进行了测试。结果表明:微弧氧化时间是影响复合氧化法制备多孔二氧化钛表面涂层形貌、结构、硬度和钙磷原子比的主要因素之一。随着微弧氧化时间的延长,涂层表面的微孔孔径增加,凹凸起伏变得明显,涂层中金红石相增加,锐钛矿相减少,表面硬度增加,钙磷原子比也发生了变化。可控制微弧氧化时间得到结构较为理想的多孔二氧化钛梯度涂层。

In order to analysis the effect of micro-arc oxidation time on the structure of the porous titania films prepared by a composite oxidation (that is pre-oxidation and micro-arc anodic oxidation), the SEM, EDS, XRD and micro-hardness testing methods were employed to investigate the phase constitutes, element compositions, morphologies and hardness of the modified films. The results show that micro-arc oxidation time is one of the major factors influencing the morphologies, structures, hardness and the ratio of Ca/P of the coatings treated by the two-step anodic oxidation treatment. With the micro-arc anodic oxidation time increasing, the diameter of the pores, roughness of the surface, hardness all increase, and the atomic ratios of Ca/P are changed at the same time. The rutile phase in the coatings become more and anatase become less when the time varied to a long period. So appropriate porous titania coatings can be gained by adjusting the micro-arc anodic oxidation time in the composite oxidation method.