采用热旋锻工艺制备了纳米复合W-4.5%ThO2阴极材料,为了对其抗烧蚀性能进行研究,在氩弧焊机(GTA)上与商用W-2%ThO2和W-4.5%ThO2电极进行了比较试验.结果表明,这种新型电极的密度接近于全致密,其组织结构与目前工艺生产的商用电极完全不同,粒径小于200 nm的ThO2颗粒弥散分布于钨基体晶粒内.纳米复合W-4.5%ThO2阴极材料的起弧性能是3种测试电极中最好的,抗烧蚀性能得到明显改善,说明电极的性能主要受ThO2含量和粒度的支配.
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