The composition and structure of ZrB2-based coatings with MoSi2, SiC, and AlN additions on metallic alloys produced by high-velocity air-fuel thermal spraying are studied. The use of composite powders with a low content of the NiCr binder (≤10 wt.%) is shown to be beneficial due to intensive adhesive interaction of the components. The phase transformations induced by high-temperature thermodynamically nonequilibrium processes, including oxygen-assisted ones, occur when the coatings are being formed. The coatings with a hardness of ~15 GPa and a porosity of ≤4% are characterized by a granular structure without cracks and have a 50–120 μm thick ceramic layer and an interfacial layer of uniform width (~10 μm) at the boundary between the NiCr alloy and stainless steel.
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Notes
The composition is in wt.%.
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Acknowledgements
The authors thank O. I. Getman, ScD in Technical Sciences, Leading Researcher of the Frantsevich Institute for Problems of Materials Science, for determining the porosity of coatings.
The research effort was funded by the Ukrainian Center of Science and Technology (Project No. R626).
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Translated from Poroshkovaya Metallurgiya, Vol. 55, Nos. 11–12 (512), pp. 71–81, 2016.
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Podchernyaeva, I.A., Grigoriev, O.N., Panasyuk, A.D. et al. High-Temperature ZrB2-Based Coatings on Metallic Alloys Produced by High-Velocity Air-Fuel Thermal Spraying. Powder Metall Met Ceram 55, 689–697 (2017). https://doi.org/10.1007/s11106-017-9856-x
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DOI: https://doi.org/10.1007/s11106-017-9856-x