纳米复合W-6%ThO_2和W-2%ThO_2阴极材料的性能对比

Comparison of Nano-composite W-6%ThO_2 and W-2%ThO_2 Cathode

摘要:

通过真空热压烧结制备了W-6%ThO2和W-2%ThO2纳米复合阴极材料,分析表明两者的显微组织类似,纳米ThO2较均匀分布在W基体上;前者的起弧电场强度低于后者,逸出功也相应降低;两者的机械性能相差不大。

Abstract:

A novel tungsten cathode material with six percents of nanoscale ThO2 used in arc plasma has been fabricated by Hot Pressing(HP) sintering. A comparative study with the cathode of two percent nano ThO2 has been made on microstructure, starting characteristics and mechanical behavior. The results show that the microstructure, consisting of tungsten matrix with homogeneous dopants of ThO2 less than 200nm, is the same as the W 2%ThO2 cathode. The arc starting field for this cathode is lower than that of the reference cathode. Its work function is also correspondingly reduced. The differences between their mechanical behavior are not much.