MAGNETRON WITH NON-FILAMENT CATHODE Russian patent published in 2010 - IPC H01J25/00 

FIELD: electric engineering.

SUBSTANCE: each of thermally secondary electronic emitters of magnetron cathode is arranged in the form of pressed porous sponge, which is shaped from mixture of powders of emission-active palladium-barium alloy at least one refractory metal of group that consists of W, Mo, Ta, Nb, Re, and/or at least one platinum metal of group that consists of Os, Ir, Pt, Ru, Rh, Pd. Besides in order to provide for high resistance to oxidation and specified brittleness of palladium-barium alloy powder it is arranged with specified content of components (11-25 wt % of barium and 75-89 wt % of palladium). In order to maintain high emission parametres of cathode, content of barium in mixture of powders included into thermally secondary electronic emitter of cathode is within the limits of 2-6 wt %. In order to provide for required value of barium flow from thermally secondary electronic emitter of cathode, open porosity of sponge in thermally secondary electronic emitter makes 2-27%.

EFFECT: increased durability, reduced duration of training at impact testing bench and increased yield of good magnetrons by increased and stabilised supply of active substance barium to surface of autoelectronic emitters of magnetron cathode, and increased coefficient of expensive cathode materials utilisation.

4 cl, 5 dwg, 2 ex