METAL-POROUS M-TYPE CATHODE MODIFIED WITH A NANOCARBON FILM AND THE METHOD FOR ITS MANUFACTURE Russian patent published in 2022 - IPC H01J9/04 

FIELD: microwave technology.

SUBSTANCE: invention relates to electronic microwave technology, namely to metal-porous cathodes of the M type and the method for their manufacture. The expected result is achieved due to the fact that a metal-porous M-type cathode contains on the emitting surface a metal or a mixture of platinum group metals (Os, Ir, Ru) coated with a graphene film with a thickness of at least a bilayer. The proposed method includes vacuum annealing of metal-porous M-type cathodes at a temperature of 1200-1250°C in a vacuum annealing unit, lowering the temperature to 800-1000°C, letting CH₄ into the chamber with a concentration of 10-20% and forming a graphene film. In addition, a second layer of M-coating is applied to the graphene film created at the cathode.

EFFECT: increasing the uniformity of emission and the durability of the cathode by modifying the emitting surface with graphene-like nanocarbon structures.

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