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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

放电等离子反应液相烧结制备CeB6阴极与性能研究

周身林, 张久兴, 刘丹敏, 包黎红   

  1. 北京工业大学 材料学院 新型功能材料教育部重点实验室, 北京 100124
  • 收稿日期:2008-11-24 修回日期:2009-01-04 出版日期:2009-07-20 网络出版日期:2009-07-20

Properties of CeB6 Cathode Fabricated by Spark Plasma Reactive Liquid Phase Sintering Method

ZHOU Shen-Lin, ZHANG Jiu-Xing, LIU Dan-Min, BAO Li-Hong   

  1. The Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2008-11-24 Revised:2009-01-04 Published:2009-07-20 Online:2009-07-20

PDF (PC)

1515

被引次数

6

摘要： 以氢直流电弧法制备CeHx纳米粉末, 再采用放电等离子（SPS）反应液相烧结纳米CeHx和微米B的混合粉末, 制备了高性能CeB6多晶块体热阴极材料. 研究了SPS制备CeB6的烧结反应式及反应液相烧结机制, 确定SPS烧结CeB6的最佳工艺为： 压力50MPa, 烧结温度1500℃, 保温时间5min. 实验结果表明, SPS制备得到了高纯单相CeB6多晶块体, 纯度达到99.89％, 相对密度达到99.61％, 维氏硬度达到2051kg/mm2, 抗弯强度达到254.2MPa. 样品在1600℃温度下拐点发射电流密度达到20.38A/cm2, 功函数为2.42eV. 与传统制备法相比, SPS制备显著降低了CeB6的烧结温度, 缩短了烧结时间, 提高了力学和发射性能.

关键词: 放电等离子烧结, 反应液相烧结, 多晶CeB6阴极, 性能

Abstract: CeHx nano-powders were prepared by hydrogen arc plasma method, and then the mixed powders of nano-CeHx and micron boron were sintered by Spark Plasma Reactive Liquid Phase Sintering (SPS) method to fabricate high-properties polycrystalline bulk CeB6 cathodes. The reaction equation of sintering CeB6 and reactive liquid phase sintering mechanism were studied. The optimum process parameters are listed as follows, pressure of 50MPa, temperature of 1500℃, and holding time of 5min. The experimental results show that the CeB6 sintered body with purity of 99.89％ and relative density of 99.61% is single-phase of cerium hexaboride. The hardness and bend strength of the sintered CeB6 reach 2051kg/mm2 and 254.2MPa. The electron emitting density of the CeB6 sintered by SPS is 20.38A/cm2 at 1600℃, the work function is 2.42eV. In contrast to traditional preparation method, SPS method obviously reduces the sintering temperature and shortens the sintering time of CeB6, and improves the mechanics and emission properties.

Key words: spark plasma sintering (SPS), reactive liquid phase sintering, polycrystalline cerium hexaboride, property

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