Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1624533 | Journal of Alloys and Compounds | 2008 | 5 Pages |
Abstract
Scandia and rhenium doped tungsten powders have been prepared by solid-liquid doping combined with two-step reduction method. The experimental results show that scandia distributes evenly in the doped tungsten powder. Moreover, the addition of scandia and rhenium could decrease the particle size of tungsten. By using this kind of powder, scandia and rhenium doped tungsten matrix with sub-micrometer sized tungsten grains and a uniform distribution of Sc2O3 together with high pore density has been obtained. The emission property result shows that high space charge limited current density of more than 30 A/cm2 at 850 °C has been obtained for this cathode. This excellent emission capability results from an active layer uniformly covering the sub-micron structure framework of the cathodes.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jinshu Wang, Yanchun Wang, Wei Liu, Lili Li, Yiman Wang, Meiling Zhou,