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空心阴极触持极溅射腐蚀会导致离子推力器性能退化甚至失效,为确保离子推力器长期工作性能稳定性,触持极材料应选用溅射腐蚀速率尽可能低的材料。开展不同触持极结构对空心阴极放电性能的影响研究。最后,进行了1 000 h短期地面寿命实验。实验结果表明,石墨触持极空心阴极放电性能稳定,长期工作触持极表面的溅射腐蚀不明显,能够有效避免空心阴极长时间工作后因触持极溅射腐蚀导致的性能退化。
Hollow cathode contact sputtering can result in degradation or even failure of the ion thruster performance. To ensure long-term performance stability of the ion thruster, a material with the lowest possible sputter corrosion rate should be used as the contact material. Research on the Influence of Different Structure of Hidden Cathode on the Discharge Performance of Hollow Cathode. Finally, a short-term surface life test of 1 000 h was carried out. The experimental results show that graphite cathode hollow cathode discharge performance is stable, long-term work of the contact surface of the sputtering corrosion is not obvious, can effectively avoid the hollow cathode prolonged operation due to the impact of the pole sputtering corrosion degradation.