材料科学与工程学报2025，Vol.43Issue(4)：604-611,8.DOI:10.14136/j.cnki.issn1673-2812.2025.04.012
铬在阴极发射活性材料中的掺杂及其对M型阴极发射性能的影响
Doping of Chromium in Emission Active Materials and the Emission Properties of Corresponding M Type Cathodes
摘要
Abstract
Emission active materials doped with chromium(Cr)which used in coated dispenser cathodes were prepared by chemical co-precipitation method.The composition,morphology and emission performance of the materials as well as the corresponding cathodes were test and discussed.Results show that Cr can be doped into emission active materials successfully,and the materials were composed of alkali earth metal carbonates,barium chromate(BaCrO4),and aluminum hydroxide.The addition amount of Cr has obvious effect on the emission performance of the materials.Appropriated doping of Cr can make the corresponding M type cathode obtain excellent emission current density.In this paper,the best cathode doped with Cr can gain 44.59 A/cm2 current density at 1050℃B.Considering of the emission mechanism of cathode and the results in this paper,Cr might react with both active element Ba and matrix element W in cathodes,and bring benefits to properties of cathodes through affecting on the formation,migration,and distribution of Ba.关键词
铬(Cr)/发射活性材料/覆膜扩散阴极(M型阴极)/发射电流密度Key words
Chromium(Cr)/Emission active materials/Coated dispenser cathode(M type cathode)/Emission current density分类
数理科学引用本文复制引用
李娜,张培先,张珂,邵文生,冯进军..铬在阴极发射活性材料中的掺杂及其对M型阴极发射性能的影响[J].材料科学与工程学报,2025,43(4):604-611,8.基金项目
国家自然科学基金资助项目(61971386) （61971386）
基础科研稳定支持项目(11109/11124) （11109/11124）
