Fabrication and thermionic emission properties of lanthanum carbide doped tungsten cathodes - 文章详情页

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EI Scopus

摘要：

A　new　type　of　thermionic　cathode,　lanthanum　carbide　doped　tungsten　cathode,　has　been　fabricated　through　a　spark　plasma　sintering　method　by　using　the　mixed　powders　of　lanthanum　carbide　and　tungsten.　Lanthanum　carbide　powder　was　prepared　by　a　levitation　melting　method　in　vacuum.　The　thermionic　emission　properties　have　been　investigated.　It　is　found　that　the　concentration　of　lanthanum　carbide　has　a　significant　influence　on　the　emission　properties　of　the　cathodes.　The　emission　current　density　of　the　tungsten　cathode　at　1400　°Cb　was　increased　dramatically　from　1.09　to　3.12　A/cm2　with　the　increase　of　concentration　of　lanthanum　carbide　from　3.5　to　10　wt%.　The　emission　mechanism　of　the　cathode　has　been　discussed.　©　2014　Elsevier　B.V.　All　rights　reserved.

关键词：

Carbides Fabrication Lanthanum compounds Powder metals Powder technology Spark plasma sintering Thermionic cathodes Thermionic emission Tungsten compounds

作者机构：

[ 1 ] [Dong, Liran]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Wang, Jinshu]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Liu, Wei]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Li, Changcai]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Zhang, Jie]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Yang, Yunfei]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 7 ] [Zhou, Fan]Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China

通讯作者信息：

王金淑
[wang, jinshu]key laboratory of advanced functional materials, college of materials science and engineering, beijing university of technology, beijing; 100124, china

电子邮件地址：

wangjsh@bjut.edu.cn

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