真空电子技术Issue(3)：42-46,5.
阴极基体材料对空间行波管阴极寿命的影响
Influence of Substrate on Cathode Lifetime for Space Traveling Wave Tubes
摘要
Abstract
According to the failure mechanism of the cathode used in space travelling wave tubes,the developments of cathode material were illustrated and factors limiting the long-lifetime of cathodes were analyzed.Effects of particle characteristics and porous performance of the substrate on evaporation rate of active material penetrating into the substrate were discussed.The work function of M-cathode would change continuously in working process because of the influence of elemental alloying on surface,barium supplying in channels and surface coverage.It was suggested that narrow size distributed powders with regular shapes and mean grain size of 4 μtm were helpful for improving porous property and reducing percentage of close pores.Mixing cathode substrate with noble metal Os or Ir,or covering cathode surface with Os or Ir film,could effectively slow down the alloying speed,reduce the evaporation,keep low work function,and so improve cathodes lifetime.关键词
阴极基体/功函数/合金化/阴极寿命Key words
Cathode substrate/Work function/Alloying/Cathode lifetime分类
信息技术与安全科学引用本文复制引用
夏扬,谢元锋,姜珩,吕宏..阴极基体材料对空间行波管阴极寿命的影响[J].真空电子技术,2017,(3):42-46,5.
