氧化钪混合钨基扩散型阴极表面结构的研究  

Study on Surface Structure of Scandia Mixed Tungsten Matrix Impregnated Dispenser Cathode

作　　者：王金淑[1] 刘伟[1] 崔云涛[1] 张喜珠[1] 王亦曼[1] 周美玲[1] 

机构地区：[1]北京工业大学,北京100124

出　　处：《稀有金属材料与工程》2009年第12期2191-2194,共4页Rare Metal Materials and Engineering

基　　金：国家"863"项目(2006AA03Z524)

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

关 键 词：含钪扩散阴极 活性层 扩散 氧化钪 

分 类 号：TG146.4[一般工业技术—材料科学与工程]