钛合金微弧氧化膜微晶生长特性的研究

在Na₂CO₃-NaOH溶液中, 采用自制多功能单极性脉冲微弧氧化电源在TC4钛合金上制备了TiO₂薄膜. 利用XRD和SEM分别对氧化膜的相组成和表面形貌进行了分析. 结果表明, 在脉冲频率和电流密度分别固定为5000Hz和20A/dm²时, 氧化膜主要含锐钛矿和金红石相TiO₂,随着处理时间的延长, 金红石TiO₂的相对含量逐渐增加; 氧化膜呈多孔结构, 表面布满了尺寸在300nm～1μm之间的TiO₂颗粒, 随着处理时间的延长, 这些颗粒微孔的尺寸明显变大, 其密度逐渐减小.

Microcrystal Growing Characters of Titania Film by MAO

By using a unipolar multifunction pulse power supply, titania films with micropores and micrograins were prepared by microarc oxidation of titanium alloy in a Na₂CO₃ and NaOH electrolytic solution under the condition of the constant pulse current density and frequency of 20A/dm² and 5000Hz. XRD and SEM were employed to characterize the phase component and surface morphology of the films. The experimental results show that (1) the film consists of rutile and anatase phases, and the content of rutile increases with the increasing treatment time; (2) the coating surface is porous and has a large number of micrograins sized from 300nm to 1μm, and the sizes of the micrograins and micropores increase gradually, with the increasing time, while their densities decrease by degrees.