Fabrication and thermionic emission properties of lanthanum carbide doped tungsten cathodes - Details

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Abstract：

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.

Keyword：

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

Author Community：

[ 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

Reprint Author's Address：

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

Email：

wangjsh@bjut.edu.cn

Show more details

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Source ：

Materials Letters

ISSN： 0167-577X

Year： 2015

Volume： 146

Page： 47-50

3 . 0 0 0

JCR@2022

ESI Discipline： MATERIALS SCIENCE;

ESI HC Threshold：319

JCR Journal Grade：2

CAS Journal Grade：3

Cited Count：

WoS CC Cited Count： 0

SCOPUS Cited Count： 9

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 13

Affiliated Colleges：

材料科学与工程学院本学院/部未明确归属的数据

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