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A nano-Sc2O3-added W powder for use in high current density thermionic cathodes has been made using a solution-gel method with the following controllable uniform average particle sizes: ~72, 146, 272, and 587 nm. Using these powders, nanostructured Sc2O3 -added tungsten matrices with uniform nanosized tungsten grains and homogenous pore distribution were obtained. Nanocomposite Sc2O3-added W impregnated...
Sc2O3-doped W powder for use in high current density thermionic cathodes has been made by the sol-gel method with different particle sizes. Sc2O3-W matrix cathodes have been prepared from these powders, and have shown excellent emission properties. A space charge limited current density of 80 A/cm2 at 1150°C, 50 A/cm2 at 1050°C have been obtained by using 500 nm Sc2O3-doped W powders. Life testing...
Nano Sc2O3-doped W powder for use in high current density thermionic cathodes has been made by the sol-gel method with different average particle size: around 72 nm, 146 nm, 272 nm, and 587 nm, respectively. By using these powders, Sc2O3-doped tungsten matrices with the nanosize tungsten grains were obtained as discussed in this paper. Sc2O3-doped W matrix impregnated cathodes have shown excellent...
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