High current density Sc_2O_3-W matrix dispenser cathode

查看全文 作　　者：WANG [1]JinShu;ZHANG [1]XiZhu;LIU [1]Wei;WANG [1]YiMan;ZHOU [1]MeiLing;ZUO [1]TieYong

机构地区：[1]School of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Science China(Information Sciences)》索引2012年第55卷第1期,共8页

基　　金：supported by National Natural Science Foundation of China(Grant No.51071005);Doctoral Fund of Ministry of Education of China(Grant No.20101103110018);Beijing Natural Science Foundation(Grant No.2102007);Program for Excellent Talents in Beijing(Grant No.PHR201006101) 摘　　要：Sc2O3-W matrix dispenser cathodes have been prepared by powder metallurgy method and tested in Pierce electron guns.The emission current density can reach 72 A/cm2 at 900C and over 100 A/cm2 can be achieved at a temperature higher than 950C.The emission improves and then keeps stable with time throughout the life testing period of 330 h at a continuous loading of 88 A/cm2pulsed current density with a pulse width of 10μs and duty cycle of 0.2%.The cathode surface is covered by a semiconductor multilayer composed of Ba,Sc and O.The emission behavior of the cathode can be explained by a semiconductor model. 关键词：高电流密度矩阵式阴极发射电流密度半导体模型钪脉冲宽度粉末冶金法

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High current density Sc_2O_3-W matrix dispenser cathode

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