交流脉冲参数对TC4钛合金微弧氧化陶瓷膜的影响

为了研究交流脉冲占空比和频率对微弧氧化膜的影响.采用恒电流方式对TC4钛合金进行微弧氧化,用扫描电镜和X衍射仪分析膜层的表面形貌及相结构.结果表明:随占空比的增大,微弧氧化膜层的生长速率增大,金红石相TiO2相对含量增加;随频率的增大,微弧氧化膜层的生长速率减小,表面趋于平整,锐钛矿相和金红石相TiO2相对含量与处理频率无关.

Effect of the Alternate Pulse Parameter on the Micro-arc Oxidation Coatings on TC4 Titanium Alloy

In order to reveal the effect of alternate pulse duty cycle and frequency on micro-arc oxidation coat ings, ceramic coatings were formed using alternate pulse micro-arc oxidation method on alloy Ti6A14V and a constant current regime of micro-arc oxidation was applied. SEM and XRD were employed to analyze surface morphology and the phase of the coatings. The results show that with the increasing of duty cycle, the growth rates of the MAO coatings increase and the relative contents of rutile TiO2 increase. With the increasing of frequency, the growth rates of the MAO coatings decrease and the roughness of the coating surface decreases gradually. The relative content of rutile and anatase TiO2 keeps invariable with the variation of the frequency.