高温钎焊对氧化钪掺杂钨基扩散阴极的影响  

Effect of High Temperature Brazing on Sc 2O 3 Doped Tungsten-Based Diffusion Cathode

作　　者：吴浩 刘伟[1] 王亦曼[1] 杨韵斐[1] 李世磊 王金淑[1] WU Hao;LIU Wei;WANG Yi-man;YANG Yun-fei;LI Shi-lei;WANG Jin-shu(School of Materials Science and Engineering,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：《真空电子技术》2020年第6期57-62,共6页Vacuum Electronics

基　　金：国家自然科学基金项目(No.51974011,51534009,51621003)。

摘　　要：含钪扩散阴极由于其钎焊工序不同于传统的钡钨阴极,需要研究新的钎焊材料。本文通过浆混方式结合化学还原的方法制备出了Co-W/Co-Mo二元焊料以及新型Co-W-Mo三元合金焊料,其主要由Co 3 W(Mo)、Co 7(W)Mo 6物相组成。研究结果显示,Mo含量的增加降低了Co-W-Mo三元合金焊料的熔点,采用Co 3 Mo与Co 3 W摩尔比1∶1所制备焊料高温钎焊后的阴极,经过激活处理后,阴极表面未发现Co元素的存在,表明该类焊料在高温高真空状态下具有较好的稳定性,且对阴极发射性能也未造成明显影响。It is necessary to study new brazing materials since the brazing process of scandate cathode is different from that of the traditional barium-tungsten cathode.In this paper,Co-W/Co-Mo binary solder and new Co-W-Mo ternary alloy solder are prepared by slurry mixing combined with chemical reduction,which are mainly composed of Co 3W(Mo)and Co 7(W)Mo 6 phases.The research shows that the increase of Mo content decreases the melting point of the Co-W-Mo ternary alloy solder.Cobalt is not detected on the surface of activated cathode brazed with the solder of mixed Co 3W and Co 3Mo in a molar ratio of 1∶1,indicating the Co-W-Mo solder can be applied in high temperature and high vacuum conditions with excellent stability,and it has no obvious influence on the emission performance.

关 键 词：钨钴钼焊料 合金 含钪扩散阴极 高温钎焊 

分 类 号：TN105[电子电信—物理电子学]