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Microstructure and tribological properties of high-velocity oxygen fuel (HVOF) sprayed Cr3C2-NiCr-BNNSs composite coatings
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DOI：10.1080/09276440.2025.2559139.png)
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Abstract
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In this study, Cr3C2-NiCr-BNNSs composite coatings with different boron nitride nanosheet (BNNSs) contents were prepared using high-velocity oxygen fuel spraying (HVOF). The tribological properties of the composite coatings were evaluated using a reciprocating friction tester. XRD and SEM were used to characterize the composition and microstructure. Wear morphology was analysed using a super-depth-of-field digital microscope and scanning electron microscopy (SEM) to elucidate the wear mechanism. The results indicated that the composite coating containing 0.2 wt% BNNSs exhibited the best wear resistance. Compared to the original Cr3C2-NiCr coating, its wear rate and volume loss were reduced by 23.4% and 23.6%, respectively. Additionally, the Cr3C2-NiCr-0.4 wt% BNNS composite coating also exhibited enhanced wear resistance compared to the original coating. However, excessively high BNNS content (0.4 wt%) led to reduced interlayer bonding strength, increased porosity, and decreased coating thickness.
Keywords:
HVOF
Cr3C2-NiCr
boron nitride nanosheets (BNNSs)
wear rate
volume loss
wear mechanism
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2.4
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85
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2.1K
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