显微组织细化对W-ThO_2阴极性能的影响  

EFFECT OF MICROSTRUCTURE ON THE CHARACTERISTICS OF W-ThO2 CATHODE

作　　者：张晖[1] 陈献峰[2] 杨志懋[2] 丁秉钧[2] 

机构地区：[1]西安交通大学材料科学与工程学院金属材料强度国家重点实验室 [2]西安交通大学

出　　处：《材料研究学报》2000年第B01期19-22,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金! 59771021

摘　　要：采用热压烧结法制备出 Ｗ－纳米 ＴｈＯ２新型阴极材料，研究了材料的电学性能该阴极材 料的临界起弧电压比传统材料降低 ２０％；引弧较为容易和平稳，其电弧静特性曲线下降，电子发射能力增 强。A novel cathode, fine grain tungsten activated with nano-ThO2, was 'fabricated by Hot-Press sintering. In comparison to the conventional W-ThO2 electrode, the characteristics for TIG was investigated. The results show that for this cathode the striking voltage has decreased by 20% and the arc starts easy and stably. In addition, the static characteristics of arc decline and the ability of electron emission is enhanced.

关 键 词：电极性能 纳米材料 钨-纳米氧化钍 阴极材料 热压烧结 

分 类 号：O462[理学—电子物理学]