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.
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