Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9572318 | Applied Surface Science | 2005 | 8 Pages |
Abstract
We describe in this paper scandate-impregnated cathodes with sub-micron scandia-doped tungsten matrices having an improved uniformity of the Sc distribution. The scandia-doped tungsten powders were made by both liquid-solid doping and liquid-liquid doping methods on the basis of previous research. By improving pressing, sintering and impregnating procedures, we have obtained scandate-impregnated cathodes with a good uniformity of the Sc2O3- distribution. The porosity of the sub-micron structure matrix and content of impregnants inside the matrix are similar to those of conventionally impregnated cathodes. Space charge limited current densities of more than 30 A/cm2 at 850 °Cb have been obtained in a reproducible way. The current density continuously increases during the first 2000 h life test at 950 °Cb with a dc load of 2 A/cm2 and are stable for at least 3000 h.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Haiqing Yuan, Xin Gu, Kexin Pan, Yiman Wang, Wei Liu, Ke Zhang, Jinshu Wang, Meiling Zhou, Ji Li,