Conclusions
Sintered eutectic (Ti, Zr, Hf)C-(Mo, Re, W) and ZrB2-(Mo, Re, W) cathode cermets having a quasieutectic “coarse-conglomerate” structure are characterized by high stability of emission, and their effective work function is lower than that of their most emission-active components. The rapid stabilization of the emission characteristics of the eutectic cathode cermet composites is linked with the specific character of electron exchange between their phases, which creates optimum conditions for the formation of a self-stabilized structure on the surface of an emitter. The relative fall in work function exhibited by the cathode cermets investigated compared with their metallike compound components grows with increasing work function of their pure metallic components. Composite emitters of the eutectic compositions of the Me′C (Me′B2)-Me′' (where Me′' = Mo, Re, W) systems are film-type emitters, on whose surfaces thin layers of the metal Me′' form during heat treatment (sintering) and actual operation. The metal surface layers adsorb atoms from the metallike compounds Me′C and Me′B2, which are supplied to the surfaces of the emitters by diffusion.
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Translated from Poroshkovaya Metallurgiya, No. 1(205), pp. 81–87, January, 1980.
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Kosterova, N.V., Ordan'yan, S.S., Neshpor, V.S. et al. Thermionic emission properties of cermets of eutectic compositions in Me(IV)-(C, B)-(Mo, Re, W) systems. Powder Metall Met Ceram 19, 61–66 (1980). https://doi.org/10.1007/BF00798168
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DOI: https://doi.org/10.1007/BF00798168