Life test studies on tungsten impregnated cathodes
Abstract
NASA-Lewis Research Center has conducted an ongoing life test program on commercial impregnated tungsten cathodes since 1971. This brief is an update of the information as of December 1979. B-type cathodes, operated at 1100 C have been run in simulated microwave tubes at 2 A/sq cm for more than four years with about 6-percent degradation in current at a constant reference anode voltage. M-type cathodes have been operated for 30,000 h at a cathode temperature of 1010 C and 2 A/sq cm with no degradation in current as a constant reference anode voltage.
- Publication:
-
IEEE Transactions on Electron Devices
- Pub Date:
- July 1980
- DOI:
- 10.1109/T-ED.1980.20030
- Bibcode:
- 1980ITED...27.1309F
- Keywords:
-
- Cathodes;
- Impregnating;
- Performance Tests;
- Service Life;
- Thermal Degradation;
- Tungsten;
- Accelerated Life Tests;
- Current Density;
- Failure Analysis;
- Temperature Effects;
- Electronics and Electrical Engineering