High-entropy alloy c-bn composite coating of thin-walled part and preparation method thereof

By employing gradient powder spreading and ultra-low energy pulsed laser cladding technology, the problems of thermal deformation and oxidation in the remanufacturing process of thin-walled iron-based alloy parts have been solved. This has resulted in a c-BN/high-entropy alloy composite coating with excellent hardness, wear resistance, and corrosion resistance, thereby improving the overall performance and service life of the parts.

CN122147306APending Publication Date: 2026-06-05GUANGDONG OPEN UNIV (GUANGDONG POLYTECHNIC VOCATIONAL COLLEGE) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG OPEN UNIV (GUANGDONG POLYTECHNIC VOCATIONAL COLLEGE)
Filing Date
2026-01-28
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the existing technology, thin-walled iron-based alloy parts suffer from severe thermal deformation, unreasonable coating hardness, insufficient wear resistance and corrosion resistance during remanufacturing, and cubic boron nitride is prone to oxidation at high temperatures.

Method used

By employing a gradient powder layering design and ultra-low energy pulsed laser cladding technology, a gradient powder layer is laid on the surface of thin-walled parts, and Fe-Cr-Ni-Co high-entropy alloy powder and c-BN composite powder are used for cladding, combined with an ultra-low energy pulsed laser, to achieve metallurgical bonding between the coating and the workpiece, suppress c-BN oxidation and control thermal deformation.

Benefits of technology

It significantly reduces the heat input during the cladding process, inhibits the oxidation of c-BN, improves the wear resistance and corrosion resistance of the coating, ensures the dimensional accuracy and service life of parts, and is suitable for remanufacturing needs in multiple fields.

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Abstract

The application discloses a kind of high-entropy alloy c-BN composite coating of thin-walled part and preparation method thereof, belong to thin-walled part surface strengthening and remanufacturing technical field.The method includes: iron-based thin-walled part washing, drying, laying high-entropy alloy composite powder containing c-BN and Fe-Cr-Ni-Co high-entropy alloy powder, laser cladding, obtain composite coating.The method is aimed at the technical defects of large thermal deformation in the remanufacturing process of iron-based alloy thin-walled part and low hardness, insufficient wear resistance and corrosion resistance of remanufacturing coating, gradient powder laying design is adopted, and high-entropy alloy is cladded on the surface of workpiece by ultra-low laser energy.The composite coating effectively alleviates the problem of c-BN cladding oxidation in the atmosphere and the problem of large deformation of workpiece, has the performance of "high hardness wear resistance + self-lubricating + high toughness" synergy, can effectively protect the wear part, prevent the wear surface of wear part from being worn due to the hardness of coating, and can significantly increase the service life of the part.
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