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Pyrocarbon anti‐emission coatings for grid electrodes of powerful generator lamps
Author(s) -
Kostrin D. K.,
Kuznetsov V. G.
Publication year - 2020
Publication title -
vakuum in forschung und praxis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 13
eISSN - 1522-2454
pISSN - 0947-076X
DOI - 10.1002/vipr.202000734
Subject(s) - coating , layer (electronics) , crystallization , materials science , titanium , electrode , deposition (geology) , generator (circuit theory) , electric arc , metal , composite material , metallurgy , optoelectronics , chemical engineering , chemistry , power (physics) , paleontology , sediment , engineering , biology , physics , quantum mechanics
Summary In this paper application of a layer of pyrocarbon as an anti‐emission coating on metal grids of powerful generator lamps is discussed. Deposition of the pyrocarbon layer was carried out by plasma‐assisted application with the use of a vacuum arc discharge, which allows reducing the process temperature and the level of energy consumed. SEM images of the surface of the applied coating at different stages of its growth are given. The process of pyrocarbon formation can be considered as crystallization from the gas phase and includes the stages of formation of nuclei on the surface and their subsequent growth. The effectiveness of the use of pyrocarbon coatings on the grids of powerful generator lamps was confirmed by a decrease in the emission current by about three times (up to a level of about 10 mA) compared to devices that use more traditional anti‐emission coatings, such as titanium hydride.