铝酸盐的组成对钡钨阴极性能的影响

doi:10.3724/SP.J.1077.2013.13242

无机材料学报 ›› 2013, Vol. 28 ›› Issue (12): 1354-1358.DOI: 10.3724/SP.J.1077.2013.13242 CSTR: 32189.14.SP.J.1077.2013.13242

铝酸盐的组成对钡钨阴极性能的影响

王凯风, 刘伟, 王金淑

(北京工业大学教育部新型功能材料重点实验室, 北京100124)

收稿日期:2013-04-28 修回日期:2013-05-31 出版日期:2013-12-20 网络出版日期:2013-11-15
作者简介:王凯风(1987–), 男, 硕士研究生.
基金资助:
国家自然科学基金(51225402, 51071005)

Influence of Aluminates Composition on Ba-W Cathode Characteristics

WANG Kai-Feng, LIU Wei, WANG Jin-Shu

(Key Laboratory of New Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China)

Received:2013-04-28 Revised:2013-05-31 Published:2013-12-20 Online:2013-11-15
About author:WANG Kai-Feng.
Supported by:
National Natural Science Foundation of China (51225402, 51071005)

摘要/Abstract

摘要： 采用液相共沉淀法制备了612铝酸盐(n(BaO):n(CaO):n(Al₂O₃)=6:1:2)前驱粉末, 在不同气氛(H₂、CO₂、N₂)、不同温度(1300℃、1400℃、1500℃)焙烧制备铝酸盐, 系统研究了不同工艺制备的铝酸盐对钡钨阴极性能的影响。结果表明: 前驱粉末的最佳焙烧工艺为: H₂气氛、1500℃, 可获得主相为Ba₅CaAl₄O₁₂的铝酸盐, 用其制备的钡钨阴极发射电流密度可达12.2 A/cm², 蒸发速率仅为1.09×10^-8 g/(cm²?s)。

关键词: 铝酸盐, Ba₅CaAl₄O₁₂, 共沉淀法, 钡钨阴极

Abstract: Precursor powder of 612 aluminates (n(BaO):n(CaO):n(Al₂O₃)=6:1:2) was prepared by liquid phase co-precipitation method. In addition, the aluminates were prepared by calcinations of the precursor powder under different atmospheres (H₂, CO₂, N₂) and temperatures (1300℃, 1400℃, 1500℃). The obtained products are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), TG-DTA and so on. Then effects of different aluminates on the emission properties of Ba-W cathode were systematically investigated. The results show that the crystalline phase of aluminates prepared under H₂ at 1500℃ is Ba₅CaAl₄O₁₂, The Ba-W cathodes impregnated with this kind aluminates have the maximum emission current density (12.2 A/cm²) and the minimum rate of evaporation (1.09×10^-8 g/(cm²?s)).

Key words: aluminates, Ba₅CaAl₄O₁₂, co-precipitation, Ba-W cathode

中图分类号:

TB742

王凯风, 刘伟, 王金淑. 铝酸盐的组成对钡钨阴极性能的影响[J]. 无机材料学报, 2013, 28(12): 1354-1358.

WANG Kai-Feng, LIU Wei, WANG Jin-Shu. Influence of Aluminates Composition on Ba-W Cathode Characteristics[J]. Journal of Inorganic Materials, 2013, 28(12): 1354-1358.

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铝酸盐的组成对钡钨阴极性能的影响

Influence of Aluminates Composition on Ba-W Cathode Characteristics

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