M.N. Esaulov – Ph.D.(Eng.), Associate Professor, 

National Research Nuclear University «MEPhI» (Moscow)

E-mail: mesaulov@mail.ru

A.V. Chelenko – Ph.D.(Eng.), Associate Professor, 

Kaluga branch of the Bauman MSTU

E-mail: apererva@yandex.ru

V.V. Maksimov – Senior Lecturer, 

Kaluga branch of the Bauman MSTU

E-mail: maksimov_w@mail.ru

N.I. Pchelintseva – Ph.D.(Eng.), Associate Professor, 

Kaluga branch of the Bauman MSTU

E-mail: pchelintseva.n@yandex.ru

This paper presents results of the research of diffusive interaction between cathode and metallic materials in the capacity of metallic coverage, that shows, that in front of the interaction’s limit line, the peak of concentration of the active element (increased content of barium, noticeably exceeding its volume in the content of composition) is observed. In addition, some mechanisms of atoms’ «Ba» and «Li» migration are realized.

The positive role of metallic coverage is its influence on the speed of egress of atoms of the emissive, active metals on the surface from the volume of the cathode material. Metallic membrane, applied on the cathode material, limiting the stream of emissive-active materials from the volume to the surface, can make the gap between amount of coming to the surface and amount of desorbed atoms, to provide optimized level of surface coverage by adatoms emissive active metalls and, stable and reproducible emissive characteristics.

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