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Detonation Spraying of Binder-Free Tungsten Carbide: In-Situ Formation of Composite Coatings

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Abstract

For the first time, the formation of coatings by detonation spraying (DS) of a binder-free tungsten carbide, WC, was studied. The coating phase composition was shown to depend on the O/C molar ratio in the oxygen-acetylene mixture used for the spraying. Along with WC, cubic carbide/oxycarbide WC1-xOy, tungsten semicarbide W2C and metallic W were present in the coatings formed at O/C = 0.9 and O/C = 1.0, indicating the formation of cermet composite coatings. When O/C was greater than 1.1, WC almost fully transformed into metallic tungsten in the coatings. The hardness of the cermet coatings was higher than that of the metallic tungsten-based coatings. During the coating formation, noticeable compression stresses accumulated in the deposited layers. These stresses do not lead to coating detachment or cracking: coatings with thicknesses of up to 500 μm retain their integrity.

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Acknowledgments

This research was funded by the Ministry of Science and Higher Education of the Russian Federation (Project No. 075-15-2020-781). The authors are grateful to Prof. V. A. Sadykov for fruitful discussions.

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Batraev, I.S., Ulianitsky, V.Y., Shtertser, A.A. et al. Detonation Spraying of Binder-Free Tungsten Carbide: In-Situ Formation of Composite Coatings. J Therm Spray Tech 32, 249–258 (2023). https://doi.org/10.1007/s11666-022-01486-x

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