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Spectra-Mat, Inc scandia-doped tungsten powder and matrices were tested up to 19,500 hours with minimal increases in kneepoint temperature at 5 A/cm2 emission density. Cathodes were run in an accelerated life test, 100°C above the kneepoint. Data from all cathodes show consistent emission at 5 A/cm2 at or below ∼900°C during the testing. Spectra-Mat has continued the development process to create...
Spectra-Mat, Inc has developed a kilogram-scalable process for manufacturing scandia-doped tungsten powder for tungsten matrices for high current density cathodes. To validate the powder, diode testing has been performed, with multiple cathodes from a single lot and multiple powder lots. Performance results of that testing as well as initial life test data will be presented. Cathodes are consistently...
Sc2O3-W matrix dispenser cathodes have been prepared by powder metallurgy method and tested in Pierce electron guns. The emission current density can reach 72 A/cm2 at 900°C and over 100 A/cm2 can be achieved at a temperature higher than 950°C. The emission improves and then keeps stable with time throughout the life testing period of 330 h at a continuous loading of 88 A/cm2 pulsed current density...
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