| 铝酸盐的组成对钡钨阴极性能的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 王凯风 刘伟 王金淑 |
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| 作者单位： | (北京工业大学 教育部新型功能材料重点实验室, 北京100124) |
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| 基金项目： | 国家自然科学基金(51225402,51071005)~~ |
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| 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)。
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| 关 键 词： | 铝酸盐 Ba5CaAl4O12 共沉淀法 钡钨阴极 |
| 收稿时间： | 2013-04-28 |
| 修稿时间： | 2013-05-31 |
Influence of Aluminates Composition on Ba-W Cathode Characteristics |
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| 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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| Authors: | WANG Kai-Feng;LIU Wei;WANG Jin-Shu |
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| Affiliation: | (Key Laboratory of New Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China) |
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| 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)). |
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| Keywords: | aluminates Ba5CaAl4O12 co-precipitation Ba-W cathode |
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