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刘伟,李俊辉,王金淑,周帆,杨韵斐,潘兆柳,吴浩,李世磊.微波烧结法制备含钪扩散阴极及其发射性能研究[J].稀有金属材料与工程(英文),2020,49(5):1766~1772.[Liu Wei,Li Junhui,Wang Jinshu,Zhou Fan,Yang Yunfei,Pan Zhaoliu,Wu Hao and Li Shilei.Preparation of Scandium Dispenser Cathode by Microwave Sintering and It’s Electron Emission Property[J].Rare Metal Materials and Engineering,2020,49(5):1766~1772.]
Preparation of Scandium Dispenser Cathode by Microwave Sintering and It’s Electron Emission Property
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Received:March 25, 2019  Revised:October 20, 2019
DOI:
Key words: tungsten  scandate dispenser cathode  thermionic emission  microwave sintering  
Foundation item:国家863计划(项目号:2015AA1214)国家自然科学基金资助(项目号51534009)北京市教委重点项目(项目号KZ201510005003)
Author NameAffiliation
Liu Wei,Li Junhui,Wang Jinshu,Zhou Fan,Yang Yunfei,Pan Zhaoliu,Wu Hao and Li Shilei  
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Abstract:
      In this paper, uniform scandia doped tungsten powder was prepared by sol-gel method combined with reduction process, and then the scandia doped impregnated cathode was successfully prepared by microwave sintering. The characteristics of Sc-doped tungsten powder, the microstructure of cathode sponge matrix, the emission properties, and the surface behavior of the active substance were analyzed. The result shows that the scandia doped tungsten powder has the average size of around 1μm and Sc element was uniformly distributed. The morphology of the sponge skeleton have spherical shape, the pore distribution was uniform, the average pore diameter is about 0.46 μm, and scandia is evenly distributed in the matrix. The cathode prepared by the microwave sintering method exhibited good emission properties, e.g., the current density of this cathode reached 137.59 A/cm2 at 950 ℃b, and the emission slope is 1.431. The atomic ratio of Ba:Sc:O on the cathode surface is 1.8:1:2.2 after activation, and a amount of nanoparticles are present on the cathode surface , which promotes emission of the cathode.