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Emission properties of Scandia Doped Impregnated (SDI) cathodes tested at DC model has been investigated in close-spaced diodes with water-cooled copper anodes. Space Charge Limited (SCL) current density of over 40 A/cm2 has been measured at 950 ºCb after temperature compensation for electron cooling. The life test has lasted for more than 500 hours and is going on.
In this paper, the carburization method and the carburization mechanism have been studied in order to obtain the carburized La2O3 doped Mo filament cathode which could provide good emission property.
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