A functional coating for the inner wall of a metal crucible and a method for producing it

By preparing a double-layer coating on the inner wall of a metal crucible, with the inner layer being a metal bonding layer and the outer layer being a ceramic coating composed of ZTA, Dy2O3, and Er2O3, the problems of burn-off and impurity diffusion on the inner wall of the crucible during metal smelting are solved, thereby improving the service life of the crucible and the smelting quality.

CN117604432BActive Publication Date: 2026-06-02DALIAN JIAOTONG UNIVERSITY
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Patent Information

Application Number
CN202311590533.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-27
Publication Date
2026-06-02
Estimated Expiration
2043-11-27

AI Technical Summary

Technical Problem

During the metal smelting process, pollution problems arise from the burning of the inner wall of the metal crucible, the diffusion of impurities, and the peeling of coatings, especially in the smelting of magnesium alloys where excessive Fe content leads to extended production cycles.

Method used

The coating adopts a double-layer structure, with an inner metal bonding layer (Cr20Ni80) and an outer ceramic coating composed of zirconia toughened alumina ceramic (ZTA), Dy2O3, and Er2O3. The coating is metallurgically bonded to the inner wall of the metal crucible by plasma spraying technology, which improves the thermal stability and wear resistance of the coating.

Benefits of technology

It effectively reduces impurities in the molten metal, lowers the coefficient of friction, extends the service life of the crucible, improves smelting quality and production efficiency, and reduces the defect rate.

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Abstract

The present application relates to a kind of metal smelting furnace inner wall functional coating and its preparation method, belong to functional coating preparation technical field.The double-layer structure of including outer ceramic coating and inner metal connecting layer, the diffusion effect between smelting furnace and metal melt in smelting process can be isolated by outer ceramic coating, the metal connecting layer in inner layer is used to enhance the binding force between ceramic coating and metal smelting furnace inner wall, to prolong the service life of coating.The preparation process of coating includes: after the treatment to metal smelting furnace inner wall, using plasma spraying process is sprayed Cr 20 Ni 80 Alloy connecting layer is sprayed on the surface of connecting layer, ceramic coating is sprayed.The present application is prepared by plasma spraying process, can be automated production, can greatly improve the quality of smelted metal liquid, reduce the unqualified rate of product, ceramic coating can improve the hardness and wear resistance of metal smelting furnace inner surface, can eliminate the phenomenon of sticking material, promote the service life of smelting furnace.
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