利用高重频YAG激光作用在固体表面所产生的等离子体使工件和电极之间在大气环境中,并且电压远低于击穿阈值的条件下产生可控定向放电,放电坑在工件表面形成一定的坑形分布,实现毛化加工.放电坑既有单坑结构,也有多坑结构,其形貌受到放电波形、电源极性、放电介质等因素的影响.研究了碳钢、铸铁、黄铜等材料的放电坑直径与电源参数的关系.

When a high repetitive rate YAG laser pulse acts on a metal surface used as one of two electrodes, a plasma plume is produced, and a discharge occurs between the electrodes at a voltage far below breakdown threshold. So the discharge is controlled by the laser pulse. The metal surface is textured by a distribution of discharge craters. It is shown that the shape of discharge craters is determined by current waveform, electrical polarity and medium between electrodes. The relationship between diameter of craters and parameters of power supplier are investigated, especially for the three electrode materials, such as steel, iron and brass.