There are ThO2 clusters in W-4.5%ThO2 material prepared by swaging.The properties of the starting arc are better than that for W-2%ThO2 cathode material.

• 在相同的电流下，W-4.；5%25ThO2电极的电弧电压低于W-2%25ThO2阴极材料，电弧能量较低，燃弧更稳定。