Composite remelted coating and process for its production

By using a composite process of plasma arc remelting and induction remelting to treat the coating, the porosity problem of plasma sprayed coatings is solved, the density and wear resistance of the coating are improved, it is suitable for workpieces of various sizes, and the cost is reduced.

CN118256853BActive Publication Date: 2026-07-21JIANGSU UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU UNIV OF SCI & TECH
Filing Date
2024-04-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The presence of pores in existing plasma-sprayed coatings results in insufficient wear resistance and density of NiCrBSi coatings. Conventional post-processing techniques have low automation and high costs, making them difficult to adapt to workpieces of any size.

Method used

A composite remelting process combining plasma arc remelting and induction remelting is employed to remelt both the surface and interior of the sprayed coating. By combining the plasma arc and the induction coil, the density and performance of the coating are improved.

Benefits of technology

It significantly improves the density, hardness, and wear resistance of the coating, enhances the bonding strength between the coating and the substrate, reduces the coating thickness, is suitable for workpieces of any size, and is low in cost and highly automated.

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Abstract

The application provides a composite remelted coating and a preparation process thereof, and comprises the following steps: spray preparation: pretreatment of a rod substrate and drying of powdery NiCrBSi alloy powder; plasma spraying: clamping of the rod substrate, arrangement of a plasma spraying gun, setting of parameters, generation of a plasma arc by the plasma spraying gun, heating of the NiCrBSi alloy powder under the action of the plasma arc, high-speed impact of the NiCrBSi alloy powder on the surface of the rod substrate, and formation of a sprayed coating; composite remelting: plasma arc remelting and then induction remelting, resetting of plasma arc remelting parameters, generation of a plasma arc by the plasma gun, and post-treatment of the sprayed coating by remelting; placing of the rod body after the plasma arc remelting in an induction coil, setting of induction remelting parameters, post-treatment of the rod body after the plasma arc remelting by remelting using the induction coil, and formation of the composite remelted coating. The composite remelting process of the plasma arc remelting and the induction remelting improves the compactness, hardness and wear resistance of the surface and the interior of the coating.
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