Impregnant composition in dispenser cathodes
Abstract
The compositions of impregnants inside B-type dispenser cathodes containing barium calcium aluminates were examined by means of quantitative microprobe analysis. The impregnant inside the porous tungsten structure was supported with plastic in order to prevent damage when the cathode was sectioned. The impregnant compositions were found to be consistently deficient in CaO when compared to the nominal composition. Variations and reproducibility in composition are discussed.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1985
- Bibcode:
- 1985STIN...8617622K
- Keywords:
-
- Aluminates;
- Barium Compounds;
- Calcium Compounds;
- Cathodes;
- Quantitative Analysis;
- Electron Emission;
- Electron Probes;
- Porosity;
- Thermionic Emitters;
- Traveling Wave Tubes;
- Tungsten;
- Electronics and Electrical Engineering