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The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. The impregnated cathode prepared with the obtained powders has an excellent emission capability of 121 A/cm2 at 950° b in pulsed condition. The DC life test result indicates that the emission current density of 40 A/cm2 has lasted up to 4000 hours.
A new kind of pressed Y2O3 doped Ba-W dispenser cathodes are prepared by a sol-gel method combined with high temperature sintering in dry hydrogen atmosphere. The results show that the growth of the grains is hampered by the pinning effect of Y2O3 distributing uniformly on the surfaces of tungsten particles, resulting in the formation of small grain size. It is found that Y2O3 improves the secondary...
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