Method of Making a Ruggedized High Current Density Cathode.
Abstract
A high current density cathode capable of operating at current densities of 2A/sq cm to 30A/sq cm in the temperature range of 900 degrees C to 1125 degrees C is prepared by machining a porous high purity tungsten pellet containing copper in its pores and also containing about 0.6 to 2 weight percent of an activator to the desired cathode shape without reducing the pores of the emitter pellet. The pellet is then fired at 1800 degrees C in a non-oxidizing atmosphere to remove the copper filler material. The pellet is then impregnated with the Ba5Sr(WO6)2 at a temperature of 1900 degrees C in a dry inert gas atmosphere and the impregnated emitter then fired in dry hydrogen atmosphere at about 1840 degrees C for about 2.5 to 5 minutes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 25, 1979
- Accession Number
- ADD006410
Entities
People
- Bernard Smith
Organizations
- United States Army