摘要
采用XRD、SEM和AES等分析方法对氧化钪混合钨基及浸渍后的阴极微观结构及表面活性元素的行为进行研究。结果表明:基体内Sc2O3弥散均匀分布。在阴极激活过程中,Ba和Sc从内部向表面扩散,在阴极表面形成含Ba、Sc、O的表面活性层,其厚度为M型阴极活性层厚度的10倍以上。对自由钪的产生机制进行了探讨。
The microstructure and physical behaviour of active substance of scandia mixed tungsten matrix and its impregnated cathode were studied by XRD, SEM, and AES methods. The results show that Sc2O3 dispersed evenly in the matrix. During the activation period of the cathode, the surface active layer containing Ba, Sc and O is formed due to the simultaneous diffusion of Ba, Sc and O from the inner part of the cathode to the surface. The thickness of this active layer is more than ten times larger than that of ＂M＂ type cathode. The production mechanism of free scandium was discussed
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第12期2191-2194,共4页
Rare Metal Materials and Engineering
基金
国家"863"项目(2006AA03Z524)
关键词
含钪扩散阴极
活性层
扩散
氧化钪
dispenser cathodes with scandium
active layer
diffusion
5C2O3
