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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电压远低于击穿阈值的条件下产生放电。实验结果显示 ,放电坑基本上呈火山坑形 ,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。放电坑表面形貌的规律是 :①除了涂油时的阳极放电坑是单坑结构以外 ,其他条件下的放电坑都是复合多坑结构 ;②单坑结构呈火山坑形 ,坑底为圆弧形 ,熔凝物堆积在坑的边缘 ,多坑结构则是一个大的放电坑中有多个凸起尖峰
The plasma generated by the high-frequency YAG laser on a solid surface causes a discharge between the workpiece and the electrode at a voltage well below the breakdown threshold. The experimental results show that the discharge pits are basically volcanic pits, which have both single-pit structure and multi-pit structure. The shape of the discharge pit is affected by factors such as discharge waveform, power supply polarity and discharge medium. The law of surface morphology of discharge pits is as follows: 1) The discharge pits under the other conditions are all multi-pits except for the anode discharge pits when oiled; ② The structure of single pits is volcanic pits and pit bottom is round Arc, the accumulation of puddles in the edge of the pit, multi-pit structure is a large discharge pit in a number of raised spikes