The microstructure of cu Cr composite coatings produced by detonation spraying and their behavior under arc Erosion conditions

The microstructure of cu Cr composite coatings produced by detonation spraying and their behavior under arc Erosion conditions Full article

Journal

Surface and Coatings Technology
ISSN: 0257-8972

Output data

Year: 2025, Article number : 132474, Pages count : 14 DOI: 10.1016/j.surfcoat.2025.132474

Tags

Cu-Cr composite, Detonation spraying, Coating, Electrical resistance, Arc erosion

Authors

Riabinkina P.A. ¹ , Batraev I.S. ^1,2 , Ulianitsky V.Yu. ^1,2 , Cherkasova N.Yu. ¹ , Shikalov V.S. ¹ , Antropova K.A. ¹ , Babitsky D.Yu. ¹ , Trofimov A.S. ¹ , Chen P. ^3,4 , Bataev I.A. ¹

Affiliations

1	Novosibirsk State Technical University, K. Marx Ave. 20, Novosibirsk 630073, Russia
2	Lavrentyev Institute of Hydrodynamics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 15, Novosibirsk 630090, Russia
3	State Key Laboratory of Explosion Science and Safety Protection, Beijing Institute of Technology, Beijing 100081, China
4	Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China

Cu-Cr composites are extensively used as electrical contacts in vacuum circuit breakers due to their favorable electrical and mechanical properties. In this study, Cu-Cr composite coatings were formed on copper substrates by detonation spraying. Powder mixtures with chromium content ranging from 25 to 67 wt% were employed for the spraying process, and a pure copper coating was also prepared as a reference material. The microstructure and composition of the coatings were characterized using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analysis. The performance of the coatings was assessed through arc erosion testing, and the post-test surface topography of the samples was analyzed via optical profilometry. TEM analysis revealed the presence of nanoscale copper oxides in the pure copper coatings and chromium oxides in the Cu-Cr coatings, respectively. The detonation-sprayed Cu-Cr coatings exhibited high hardness (240 ± 10 HV) and adhesive strength (45 ± 10 MPa), coupled with low porosity (< 1 %). The electrical conductivity of the coatings varied between 25 and 41 % IACS, depending on the chromium content. Notably, coatings with a chromium content of 33–43 wt% exhibited no surface protrusions after arc exposure, indicating superior resistance to arc-induced damage.

Riabinkina P.A. , Batraev I.S. , Ulianitsky V.Y. , Cherkasova N.Y. , Shikalov V.S. , Antropova K.A. , Babitsky D.Y. , Trofimov A.S. , Chen P. , Bataev I.A.
The microstructure of cu Cr composite coatings produced by detonation spraying and their behavior under arc Erosion conditions
Surface and Coatings Technology. 2025. 132474 :1-14. DOI: 10.1016/j.surfcoat.2025.132474 Scopus РИНЦ OpenAlex

Submitted:	Apr 21, 2025
Accepted:	Jul 8, 2025
Published online:	Jul 8, 2025

Scopus:	2-s2.0-105010684230
Elibrary:	82779639
OpenAlex:	W4412454572

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