The design and operation of many pulsed-power devices are affected by surface flashover of insulator, resulting in reduction of voltage and current output; therefore, the physical research under the corresponding parameter is limited. Since the primary electron emission plays a critical role in the flashover process, methods that can prohibit electron emission from the cathode are expected to improve flashover performance effectively. In this article, stainless steel electrodes of different roughness are coated with alumina films by means of thermal vacuum evaporation, and the surface flashover performance is studied and compared with untreated electrodes. The results show that the first breakdown voltage, condition voltage, and hold-on voltage of coated electrodes increased by 39%, 26%, and 39% for Ra 0.8, and the increase of Ra 3.2 was quite limited. To substantially improve the flashover performance, it still needs to figure out other factors which will affect the electron emission threshold.

中文翻译：

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不同粗糙度电极覆介电膜的闪络性能

许多脉冲功率器件的设计和运行受到绝缘子表面闪络的影响，导致电压和电流输出降低；因此，相应参数下的物理研究是有限的。由于初级电子发射在闪络过程中起着至关重要的作用，因此可以期望可以阻止阴极电子发射的方法有效地提高闪络性能。本文采用真空热蒸发法在不同粗糙度的不锈钢电极上涂覆氧化铝薄膜，研究其表面闪络性能并与未处理电极进行比较。结果表明，Ra 0.8 的涂层电极的一次击穿电压、条件电压和保持电压分别提高了 39%、26% 和 39%，Ra 3 提高了。2 相当有限。要想大幅度提高闪络性能，还需要找出影响电子发射阈值的其他因素。