钨铼锇三元混合基扩散阴极的制备及发射性能  

Preparation and Emission Properties of Tungsten-Rhenium-Osmium Ternary Mixed Matrix Diffusion Cathode

作　　者：方浩鑫 刘伟[1] 杨韵斐[1] 周帆 王金淑[1] Fang Haoxin;Liu Wei;Yang Yunfei;Zhou Fan;Wang Jinshu(Key Laboratory of Advanced Functional Materials,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100124

出　　处：《稀有金属材料与工程》2024年第6期1718-1725,共8页Rare Metal Materials and Engineering

基　　金：JG军用关键材料科研项目(XXXX-XX-0743-2)。

摘　　要：采用固液混合法制备出铼钨核壳粉体,然后加入锇粉经预处理后制备出具有特殊包覆结构的三元混合粉体。粉体经过压制、烧结、浸渍、洗盐和退火等工艺制备出钨铼锇三元混合基阴极,经过411盐浸渍后,脉冲发射测试发现三元混合基阴极中成分为W2Re1Os1阴极的电子发射性能最好,在1050℃电流发射密度能够达到35A/cm^(2),电流发射密度略高于同类型的二元混合基阴极,达到覆钨铼锇三元膜阴极的水平。通过实验验证在钨铼锇三元混合基阴极浸渍过程中,Re和Os与活性盐均不发生反应,活性物质是由W和活性盐反应产生的。Rhenium-tungsten core-shell powder was prepared by solid-liquid mixing method and then osmium powder was added to prepare ternary mixed powder with special coating structure after pretreatment.After the powder was pressed,sintered,impregnated with salt,washed and annealed,a ternary mixed-base cathode of tungsten-rhenium osmium was prepared.After impregnation with 411 salt,the pulse emission test found that W2Re1Os1 cathode which is a ternary mixed-base cathode has the best electron emission performance and the current emission density can reach 35 A/cm^(2) at 1050℃,which is slightly higher than that of the same type of binary mixed-base cathode,and which reaches the level of the ternary film cathode covered with tungsten,rhenium and osmium.It is verified by experiments that neither Re nor Os reacts with the active salt during the impregnation process of the ternary tungsten-rhenium-osmium mixed-base cathode,and the active substance is produced by the reaction of W and the active salt.

关 键 词：混合基阴极 电子发射 钨铼锇 

分 类 号：TN104.1[电子电信—物理电子学]