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,2020,49(5):1766~1772.[Liu Wei,Li Junhui,Wang Jinshu,Zhou Fan,Yang Yunfei,Pan Zhaoliu,Wu Hao,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.]
微波烧结法制备含钪扩散阴极及其发射性能研究
投稿时间:2019-03-25  修订日期:2019-10-20
中文关键词:    含钪扩散阴极  热电子发射  微波烧结
基金项目: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)
中文摘要:
      本文采用溶胶凝胶结合氢还原法制备出Sc均匀掺杂的钨粉,随后采用微波烧结法成功制备出浸渍型含钪扩散阴极。对Sc掺杂钨粉特性、钪掺杂钨海绵基体微观结构、阴极发射性能和阴极表面活性物质分布进行了分析,结果显示:钪以Sc2O3的形态均匀分布于平均粒径1 μm的钨粉中,海绵体骨架主要由大小均匀的亚微米级准球形颗粒构成,表面孔结构良好,孔分布均匀,平均孔径在0.46 μm左右,Sc2O3均匀分布于基体之中。电子发射测试结果表明,该阴极950 ℃b脉冲偏离点电流密度Jdiv为137.59 A/cm2,发射斜率1.431。激活后的阴极表面Ba:Sc:O的原子比例为1.8:1:2.2,同时阴极表面存在大量的纳米粒子,对阴极发射有促进作用。
Preparation of Scandium Dispenser Cathode by Microwave Sintering and It’s Electron Emission Property
英文关键词:tungsten  scandate dispenser cathode  thermionic emission  microwave sintering  
英文摘要:
      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.
作者单位E-mail
刘伟 北京工业大学 新型功能材料教育部重点实验室 liuw@bjut.edu.cn 
李俊辉 北京工业大学 新型功能材料教育部重点实验室  
王金淑 北京工业大学 新型功能材料教育部重点实验室  
周帆 北京工业大学 新型功能材料教育部重点实验室  
杨韵斐 北京工业大学 新型功能材料教育部重点实验室  
潘兆柳 北京工业大学 新型功能材料教育部重点实验室  
吴浩 北京工业大学 新型功能材料教育部重点实验室  
李世磊 北京工业大学 新型功能材料教育部重点实验室  
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