STRUCTURAL-PHASE STATE OF WEAR-RESISTANT NANOCOMPOSITE CR3C2-NICR COATINGS DEPOSITED BY A NEW MULTI-CHAMBER GAS-DYNAMIC ACCELERATOR

1 NOVIKOV Vseslav
Co-authors:
1 KOVALEVA Marina 2 TYURIN Yuri 1 PROZOROVA Mayya 1 ARSEENKO Maria 3 SIROTA Viacheslav 1 VAGINA Olga
Institutions:
1 Belgorod State National Research University, Pobedy 85, Belgorod 308015 Russia, kovaleva@bsu.edu.ru
2 E.O. Paton Electric Welding Institute NASU, Bozhenko 11, Kyiv 03650, Ukraine
3 Belgorod State Technological University named after V.G. Shoukhov, Kostyukov 46, Belgorod 308012, Russia
Conference:
9th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 18th - 20th 2017
Proceedings:
Proceedings 9th International Conference on Nanomaterials - Research & Application
Pages:
904-908
ISBN:
978-80-87294-81-9
ISSN:
2694-930X
Published:
8th March 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
20 views / 5 downloads
Abstract

The hardmetal Cr3C2-25NiCr (180-220 μm thick) coatings have been produced on a steel substrate by a new multi-chamber gas-dynamic accelerator. The Cr3C2-25NiCr powder (POLEMA JSC, Russia) (35-140 μm) was used as the starting material to deposit a dense layer. A detailed analysis of the features of the coatings structure on all the levels of the structure (from grain to dislocation) (phase composition, distribution of the disperse phase, grain nature, subgrains and dislocation structures) was conducted. The structural-phase state of the coatings was characterized using SEM, TEM, and XRD techniques. It was established that phase composition of Cr3C2-NiCr powder under the influence of high temperatures and the atmosphere of detonation products changes with the formation of a complex heterogeneous structural-phase state in the coatings. A layered structure of the regions of carbide particles and matrix metal was found in the immediate vicinity of the "carbide-matrix" boundary with the precipitates in the matrix of dispersed secondary carbides. It was shown that the nanocomposite Cr3C2-NiCr coatings are characterized by the presence of nanodispersed ceramic compounds. Lamellae in the coatings consisted of nanocrystalline grains, separated by interlayers of the amorphous phase and oxide crystalline grains.

Keywords: gas-dynamic accelerator, Cr3C2 – NiCr, nanocomposite coatings, microstructure, TEM
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