FIELD: electronic engineering; thermal and secondary-emission cathodes. SUBSTANCE: cathode has open pores directly in cathode base on emitting surface side which are filled with emitting compound. Cathode- manufacturing process includes oxidation of high-melting base in air at 600-1500 C followed by recovery of oxide layer in hydrogen at 700-1300 C and sintering at 1300-2000 C. Proposed process makes it possible to manufacture porous-metal cathodes of different shapes including those with internal emitting surface as well as spiral cathodes. EFFECT: enhanced thermal-cycle endurance; reduced cost. 2 cl, 4 dwg
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