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In-situ synthesis of (Nb,Mo) C composite carbides via Mo₂C decomposition: A novel strategy for synergistic wear and corrosion resistance in laser-cladded Ni-based coatings
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DOI：10.1016/j.surfcoat.2026.133690.png)
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Abstract
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• A novel (Nb,Mo)C composite carbide was in-situ synthesized in Ni-based coatings using Mo₂C as a non-graphite carbon source. • Coating microstructure was strategically tailored from columnar to equiaxed grains with increasing (Nb+Mo₂C) content. • The 20% (Nb+Mo₂C) coating achieved a combination of high hardness, excellent wear resistance, and superior corrosion resistance. • Corrosion resistance stems from a dense, multi-oxide (Cr₂O₃/Nb₂O₅/MoO₃) passive film with minimal defect density.
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