Impregnant Composition in Dispenser Cathodes.
AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB
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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. Keywords include Cathodes Dispenser cathodes Electron microprobe analysis Impregnated cathodes Thermionic emitters and Traveling-wave tubes.
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