کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1624533 | 1516418 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Emission property of scandia and Re doped tungsten matrix dispenser cathode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 459, Issues 1â2, 14 July 2008, Pages 302-306
Journal: Journal of Alloys and Compounds - Volume 459, Issues 1â2, 14 July 2008, Pages 302-306
نویسندگان
Jinshu Wang, Yanchun Wang, Wei Liu, Lili Li, Yiman Wang, Meiling Zhou,