大电流密度钪酸盐阴极制备的研究  

Research on High Current Density Scandate Cathode Preparation

作　　者：王卉[1] 邵文生[1] 高玉娟[1] 李娜[1] 

机构地区：[1]北京真空电子技术研究所,北京100015

出　　处：《真空电子技术》2016年第4期33-37,共5页Vacuum Electronics

摘　　要：本文对钪酸盐浸渍式扩散阴极进行制备与研究。选择5种不同粒径的钨粉以及钪钨粉进行阴极基体的制备。通过对压制、烧结、浸渍工艺的改进优化及控制获得含钪扩散阴极。对阴极基体粉末进行分析，对阴极进行了脉冲发射测试，并将结果与普通浸渍式含钪扩散阴极进行了比较。研究结果表明这一批阴极的脉冲发射电流密度在1000℃，拐点发射电流密度达到60A／cm^2；1050℃时，能够得到接近130A／cm^2的拐点发射电流密度；同时空间电荷区的斜率为1．37～1．44，最高达到1.44，接近理论值1.5，这说明该阴极在具有优异发射性能的同时也具有很好的发射均匀性。Scandate cathodes are prepared and studied in this research. The cathode matrixs are made of scandia-tungsten and pure tungsten powers with various sizes. Based on a series of techniques including pressing, sintering and impregnating, scandate dispenser cathodes are fabricated. The properties of the powders are analyzed. The pulse emission performances of cathodes are tested in water-coolling-anode diodes, and then are compared with those of common cathodes. The results show that the pulse emission inflexion current density of the cathodes reaches 60 A/em at 1000℃ and 130A/cm^2 at 1050℃. While the space charge region slopes are between 1.37--1.44, approaching the theoretical value 1.5. The result reveals that cathode has an excellent emission ability and very good emitting uniformity.

关 键 词：钪酸盐阴极 电流密度 均匀性 

分 类 号：O462[理学—电子物理学]