含钪扩散阴极用铝酸盐的制备及发射性能研究

doi:10.3724/SP.J.1077.2012.00480

无机材料学报 ›› 2012, Vol. 27 ›› Issue (5): 480-484.DOI: 10.3724/SP.J.1077.2012.00480 CSTR: 32189.14.SP.J.1077.2012.00480

含钪扩散阴极用铝酸盐的制备及发射性能研究

崔云涛, 王金淑, 刘伟, 王茜, 王凯风

(北京工业大学材料科学与工程学院教育部新型功能材料重点实验室, 北京100124)

收稿日期:2011-06-08 修回日期:2011-08-30 出版日期:2012-05-10 网络出版日期:2012-03-31
作者简介:崔云涛(1983-), 男, 博士研究生. E-mail: cuiyuntao@emails.bjut.edu.cn
基金资助:
国家自然科学基金(51071005);北京市自然科学基金(2102007);拔尖人才计划(PHR201006101);教育部博士点;基金(20101103110018)

Fabrication of Aluminate for Scandia Doped Dispenser Cathode and Emission Property

CUI Yun-Tao, WANG Jin-Shu, LIU Wei, WANG Xi, WANG Kai-Feng

(Key Laboratory of New Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China)

Received:2011-06-08 Revised:2011-08-30 Published:2012-05-10 Online:2012-03-31
About author:CUI Yun-Tao. E-mail: cuiyuntao@emails.bjut.edu.cn
Supported by:
National Natural Science Foundation of China (51071005);Natural Science Foundation of Beijing (2102007);Program for Excellent Talents in Beijing (PHR201006101);Doctoral Fund of Ministry of Education of China (20101103110018)

摘要/Abstract

摘要：

采用液相共沉淀法和固相合成法分别制备411(4BaO:CaO:Al₂O₃)铝酸盐前驱粉末, 在钨网氢气炉中高温烧结. 采用喷雾干燥法结合两步氢气还原法制备出亚微米氧化钪掺杂钨粉. 随后经过压制, 烧结, 浸渍, 水洗, 退火等工艺获得具有亚微米结构的含钪扩散阴极, 并研究含钪扩散阴极的电子发射性能. 实验结果表明, 液相共沉淀法制备的铝酸盐在1500℃烧结后, 铝酸盐中Ba₅CaAl₄O₁₂衍射峰最强, 结晶程度最高. 液相共沉淀法含钪扩散阴极, 脉冲发射电流密度在850℃达到37.89 A/cm². 在激活过程中, 阴极表面形成“Ba-Sc-O”发射活性层, “Ba-Sc-O”发射活性层存在提高了阴极热电子发射能力, 降低了含钪扩散阴极的蒸发速率.

关键词: 铝酸盐, 钪钨阴极, 液相共沉淀, 喷雾干燥

Abstract:

Barium calcium aluminate (4BaO:CaO:Al₂O₃) was synthesized via liquid phase co-precipitation and solid phase mixing respectively and sintered in hydrogen atmosphere. Scandia doped tungsten powders were prepared in a new process of spray drying combined with two-step hydrogen reduction. During the preparation of scandia doped impregnated cathodes, a series of procedures, including pressing, sintering, impregnating, water cleaning and annealing were taken to obtain the impregnated cathodes. The results show that Ba₅CaAl₄O₁₂is formed after high temperature sintering. After impregnation, scandia doped impregnated cathodes with porous sub-micron structure are obtained. For full activation at 1150℃, the cathode surface is covered by a Ba-Sc-O active substance layer with a preferable atomic ratio, leading to its good emission property with space charge limited current density of 37.89 A/cm² at 850℃.

Key words: barium calcium aluminate, scandate cathode, liquid phase co-precipitation, spray drying

中图分类号:

TQ133

崔云涛, 王金淑, 刘伟, 王茜, 王凯风 . 含钪扩散阴极用铝酸盐的制备及发射性能研究[J]. 无机材料学报, 2012, 27(5): 480-484.

CUI Yun-Tao, WANG Jin-Shu, LIU Wei, WANG Xi, WANG Kai-Feng. Fabrication of Aluminate for Scandia Doped Dispenser Cathode and Emission Property[J]. Journal of Inorganic Materials, 2012, 27(5): 480-484.

图/表 6

图1 不同方法制备的铝酸盐前驱粉末的SEM照片及能谱分析 (a) Liquid phase co-precipitation; (b) Solid phase mixing

Fig. 1 SEM images of aluminate precursors fabricated by different methods and corresponding EDS results

图2 经不同温度煅烧铝酸盐的XRD图谱

Fig. 2 XRD patterns of two aluminates calcined at different temperatures

图3 氧化钪掺杂钨粉的XRD图谱(a)及SEM照片(b)

Fig. 3 XRD pattern(a) and SEM image(b) of scandia doped tungsten powders

图4 浸渍型含钪扩散阴极的扫描电镜图及阴极断面能谱分析

Fig. 4 SEM images of scandia doped imgrgnated cathode and corresponding EDS results (a) Surface; (b) Cross-section

图5 浸渍不同方法制备的铝酸盐含钪扩散阴极的电子发射性能

Fig. 5 Electron emission property of the cathode impregnated with the aluminates prepared by different methods

图6 1150℃激活后含钪扩散阴极表面的俄歇能谱图

Fig. 6 AES spectrum for surface of scandia doped impregnated cathode fully activated at 1150℃

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含钪扩散阴极用铝酸盐的制备及发射性能研究

Fabrication of Aluminate for Scandia Doped Dispenser Cathode and Emission Property

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