Journal of Siberian Federal University. Engineering & Technologies / Strengthening of Electrically Conductive Cu–MMNCr Composite Material with a Copper- Based Metal Matrix by Nano- and Micro- Sized Chromium Particles

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Issue
Journal of Siberian Federal University. Engineering & Technologies. 2025 18 (3)
Authors
Busygin, Sergei L.; Dovzhenko, Nikolai N.; Tokmin, Aleksandr M.; Shaichadinov, Aleksandr A.; Mishnev, Sergei V.
Contact information
Busygin, Sergei L.: Siberian Federal University Krasnoyarsk, Russian Federation; ; Dovzhenko, Nikolai N.: Siberian Federal University Krasnoyarsk, Russian Federation; Tokmin, Aleksandr M. : Siberian Federal University Krasnoyarsk, Russian Federation; Shaichadinov, Aleksandr A. : Siberian Federal University Krasnoyarsk, Russian Federation; Mishnev, Sergei V. : Siberian Federal University Krasnoyarsk, Russian Federation
Keywords
resistance welding electrodes; copper-based composite material; frequency modulation of current; theory of fuzzy sets
Abstract

The article discusses the mechanisms of dispersion strengthening by nanosized chromium particles of a composite material with a copper-based metal matrix (Cu–MMNCr) without loss of electrical conductivity from which resistance welding electrodes are made. A study of the fractional composition of chromium nanopowder after grinding in a planetary-centrifugal mill was carried out and a method of introducing it into a copper melt using a tablet alloy was proposed. Uniform distribution of nanosized chromium particles in the melt is achieved by stirring by frequency modulation of current (in the range of 35–40 Hz from the operating frequency) in an alternating electromagnetic field. A thermodynamic analysis of the formation of reactions of interaction between melt components during the preparation of the Cu–MMNCr composite material was carried out. The wetting of nanosized chromium particles and lump chromium by copper melt was studied. A model of dispersion strengthening by nanosized chromium particles in structural changes of a composite material with a copper-based metal matrix, built on the fuzzy set hypothesis, is considered. The mechanical and electrical conductive properties of the Cu–MMNCr composite material were studied

Pages
392–408
EDN
SLUCUO
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/156050

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