Open AccessOn the Issue of the Thermal Emission Cathode Resource on the Oxide Films of Hafnium and Zirconium
Author(s) -
M. Klochok,
Yu.S. Popil,
Valeriy Chernyak,
V.V. Iukhymenko,
I.I. Fedirchyk,
В. Н. Ткач
Publication year - 2019
Publication title -
plasma physics and technology
Language(s) - English
Resource type - Journals
eISSN - 2336-2634
pISSN - 2336-2626
DOI - 10.14311/ppt.2019.3.247
Subject(s) - cathode , hafnium , zirconium , materials science , thermionic emission , hot cathode , oxide , vacuum arc , analytical chemistry (journal) , nuclear engineering , metallurgy , electron , chemistry , nuclear physics , physics , chromatography , engineering
The article shows the results of research on the destruction of the thermionic cathode of an arc plasma torch when inserting hafnium and zirconium along the trace of the spot of a gas-discharge arc by means of electronic metallography with spectral analysis in the control region. The depth of penetration of the spot into the metal of the cathode insert was determined due to the discrete mechanism of action on the metal at the time of attachment. The erosion rate of zirconium oxide films was experimentally established, the extension of the operating life substantiated while mechanisms for its increase were revealed, and two types of arc contact with a hafnium or zirconium insert - the "contracted" and "diffused" ones - were offered. The theoretical operating life of the cathode is calculated.