Electrometallurgy Today, 2025, №01

2025 №01 (07)

DOI of Article 10.37434/sem2025.01.08

2025 №01 (09)

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"Suchasna Elektrometallurgiya" (Electrometallurgy Today), 2025, #1, 45-50 pages

Influence of heat treatment on the structure, properties and life of flat tungsten cathodes

L.A. Krushinska¹, Ya.A. Stelmakh¹, R.A. Tkach², O.O. Yukalchuk², A.A. Dudnik³

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: lkrushynska@gmail.com
²State-run Company «International Center for Electron Beam Technologies of E.O. Paton Electric Welding Institute of the NAS of Ukraine». 68 Antonovicha Str., 03150, Kyiv, Ukraine. E-mail: tkachroman@gmail.com
³LLD «TANGSTEN». 19a Dniprovska Naberezhna, of. 33, 02081, Kyiv, Ukraine. E-mail: tungsten.kom@gmail.com

Abstract
The effect of heat treatment on the structure and properties of flat tungsten thermionic cathodes (W-cathodes) produced by hot pressing (flattening) of blanks from 99.99 % pure tungsten wire was investigated. The influence of temperature (800…1200 °C) and vacuum annealing time (0.3…2.0 h) on the formation of a recrystallization structure in W-cathodes was studied; comprehensive comparative studies of the structure, mechanical and operational properties were carried out. It was found that to increase the service life of W cathodes, a mixed structure should be formed in them in the following quantitative ratio: 5…25 % — equiaxed recrystallized grains 1…8 μm in size; the remaining volume of the cathode material should preserve the original oriented structure. 18 Ref., 5 Fig.
Keywords: thermionic cathodes, tungsten, electron beam installations, recrystallization, microstructure

Received: 15.01.2025
Received in revised form: 02.02.2025
Accepted: 25.02.2025

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