电流脉冲宽度对铝合金微弧氧化过程的影响  

Effect of current pulse width on micro-arc oxidation process for aluminum alloy

作　　者：葛延峰[1] 蒋百灵[1] 时惠英[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《材料热处理学报》2013年第10期165-169,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(51071121);国家"十二五"科技支撑计划项目(2011BAE22B05)

摘　　要：为了探讨脉冲微弧氧化电源下电流脉冲宽度对1015铝合金微弧氧化过程的影响规律,利用示波器记录电流波形,借助涡流测厚仪测量陶瓷层厚度,采用扫描电子显微镜观察陶瓷层微观形貌,并根据电压变化曲线计算微弧氧化过程能量消耗。结果表明,随脉宽由15μs增至60μs,起弧时间由90 s缩短至25 s,起弧电压先降低后趋于稳定并在脉宽30μs时达到较小值375 V;陶瓷层表面放电微孔孔径增大,微孔数量减少,陶瓷层厚度增加但致密度下降;起弧过程能量消耗随脉宽增大先减少后增加,并在脉宽为30μs时达到较小值16.5 kJ;陶瓷层生长过程能量消耗随脉宽增大近似成倍增加。In order to investigate the effect of current pulse width on micro-arc oxidation（MAO） process for a 1015 aluminum alloy（Al） using pulse power source, the pulse shapes were recorded by oscillograph, the thickness of MAO coat was measured by eddy current thickness gauge, the surface morphology of MAO coat was observed by scanning electron microscopy （SEM） , and the energy consumption of MAO process was calculated by the curve of voltage change. The results indicate that with current pulse width increasing from 15 p.s to 60μs, arcing time in MAO process shortens from 90 s to 25 s, the arcing voltage first drops and then tends towards stability. When the pulse width at 30μs, the arcing voltage reaches the less value of 375 V. The pore diameter of millipore enlarges, and the quantity reduces. The more thick ceramic coat on Al samples induces the decrease of the density. The energy consumption of arcing process first increases and then decreases with the increasing current pulse width, and the less value is 16.5 kJ at pulse width of 30 μs. The energy consumption of MAO coat growing process nearly doubles with the increasing current pulse width.

关 键 词：铝合金 微弧氧化 脉冲宽度 能量消耗 

分 类 号：TG174.4[金属学及工艺—金属表面处理]