Study of metal film coating on Sc2O3 mixed matrix impregnated cathodes

A review on recent progress of thermionic cathode

“…Then researchers paid a lot of effort to increase the electron emission capability by controlling the introducing approaches of Sc and the microstructure of the obtained cathodes, and advanced strategies including the liquid-liquid (L-L) precipitation method, liquid-solid (L-S) precipitation method [73] and pulse laser deposition (PLD) technology [74] are developed to improve the distribution uniformity of the scandium oxide. Up to now, Sc-cathodes have been considered as one of the most potential candidates for the next generation cathodes with high current density [75][76][77], and could be divided into three different types [45]: the top-layer scandate cathode [72], impregnated scandate cathode (Sc 2 O 3 was mixed with Ba-Ca-aluminate impregnant) and scandia-doped dispenser (SDD) cathode [78].…”

Preparation and characterization of scandia and Re doped tungsten matrix impregnated cathode

“…It had been widely demonstrated that scandate cathodes have highemission current density [1][2][3][4][5]. However, there was a common problem referring to non-uniformity in emission existing in all kinds of scandate cathodes.…”

Emission property of scandia and Re doped tungsten matrix dispenser cathode

“…An increase of electron emission current density at a given operating temperature is one of the main goals of thermionic cathode improvement for different applications in vacuum tubes. For thermionic cathodes, one of the most prospective candidates for the continuously improved vacuum devices in high emission current is scandate cathode [1][2][3][4][5][6][7][8]. However, the problems preventing high emission scandate cathodes from being widely utilized normally come down to a possible non-uniformity in emission, the susceptibility to ion bombardment damage and the poor reproducibility [9].…”