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阴极电压脉冲占空比对钛合金微弧氧化膜特性的影响

唐元广 吴汉华 常鸿 陈根余 桑勇 白亦真

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阴极电压脉冲占空比对钛合金微弧氧化膜特性的影响

唐元广, 吴汉华, 常鸿, 陈根余, 桑勇, 白亦真

Effects of cathodic voltage pulse duty cycle on characteristics of microarc oxidation coatings of titanium alloy

Tang Yuan-Guang, Wu Han-Hua, Chang Hong, Chen Gen-Yu, Sang Yong, Bai Yi-Zhen
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  • 利用自制多功能微弧氧化电源,在保持双极性电压脉冲幅度不变的条件下,研究了阴极电压脉冲占空比(dc)对钛合金微弧氧化膜特性的影响.结果表明:阴、阳极的峰值电流随处理时间的变化分为几个不同阶段,各阶段的开始和结束时间与dc密切相关.氧化膜主要由金红石和锐钛矿相TiO2组成,金红石相TiO2的相对含量在dc=50%附近随dc的
    Under the condition of keeping the bipolar pulse voltage constant, the effect of cathodic pulse voltage duty cycle (dc) on characteristics of microarc oxidation coatings of titanium alloy have been studied by using a multifunction microarc oxidation power supply. Experimental results show that the variations of cathodic and anodic currents with treatment time show obviously several stages, and the beginning and ending time of various stages are closely related to dc. The coating consists mainly of rutile and anatase phases, and there is a sudden change in the rutile phase content at dc=50%. The thickness, morphology and microhardness of the coating strongly depend on dc change. The microhardness valucs of the coatings prepared at dc=50% and dc=70% are the minimum (4.96 GPa) and the highest (6.1 GPa), respectively. In general, the MAO coatings prepared in the range of 65%≤dc≤80% have higher growth rate and quality.
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出版历程
  • 收稿日期:  2008-07-22
  • 修回日期:  2008-12-03
  • 刊出日期:  2009-07-20

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