期刊论文

Poisoning characteristics of LaB_6 hollow cathode

Long, J.

中文

国防科技大学学报

1001-2486

2020

42

4

93-97

10.11887/j.cn.202004015

国家自然科学基金资助项目（11702123）； 军用电子元器件支撑项目（1607XM0004）；

本校为其他机构

LaB_6阴极与其他类型阴极相比具有电子发射电流密度大等优点,已广泛用于电推进、高发射密度电子枪等产品。为了研究LaB_6空心阴极中毒特性、识别LaB_6空心阴极主要失效模式,分别对LaB_6空心阴极暴露大气后性能变化特征和引起性能变化的原因进行了研究。结果表明:LaB_6空心阴极在暴露大气后表面吸附大量中毒气体,出现了发射体表面逸出功增加、发射体短期中毒现象。此时空心阴极的放电电压和阴极顶温度均有所上升,经过短期工作后放电电压和阴极顶温度均恢复初始状态。但LaB_6空心阴极严重中毒后,并不能通过加热和离子轰击方式去除表面生成的氧化物。因此,可以在实验过程中通过监测空心阴极的阴极顶...

Compared with other cathodes, LaB6 cathode has the advantage of high electron emission current density, and has been widely used in electric propulsion, high emission density electron gun and other products. In order to analyze the poisoning characteristics of the LaB6 hollow cathode and identify its failure mode, the performance change features and reasons of LaB6 hollow cathode exposed to atmosphere were studied. The results show that the LaB6 hollow cathode adsorbs a great deal of poisonous gas on the surface of the emitter during exposure t...