Rare earth reinforced metal ceramic composite coating and preparation method thereof

CN119464997APending Publication Date: 2025-02-18ZHONGSHAN FLASHLIGHT POLYTECHNIC
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Patent Information

Application Number
CN202411444715.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-16
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

The coatings prepared by existing thermal spraying technology have intrinsic defects such as uneven hardness distribution, pores and microcracks, which limit their application in industrial production.

Method used

Rare earth oxides, TiB2 and Cr-based alloy powders are mixed in a specific proportion, and rare earth reinforced metal cermet composite coating is prepared through high-energy ball milling, spray granulation and plasma spheroidization treatment. It is then used to use supersonic active flame thermal spraying technology to prepare it. Coated on the surface of the substrate.

Benefits of technology

Through the addition of rare earth elements, the refinement of the microstructure of the coating is promoted, the hardness and wear resistance of the coating are improved, the coating defect problem is solved, and the service life of the workpiece under complex working conditions is significantly improved.

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Abstract

The invention discloses a rare earth reinforced metal ceramic composite coating and a preparation method thereof.The coating is formed by thermally spraying a spraying structure feed on a base material, the spraying structure feed comprises, by mass, 4%-8% of rare earth oxide, 46%-62% of TiB2 and 30%-50% of Cr-based alloy powder, the rare earth oxide is composed of Y2O3 and CeO2, the TiB2 is composed of Y2O3 and CeO2, the Cr-based alloy powder is composed of Cr-based alloy powder, the TiB2 is composed of TiB2, and the Cr-based alloy powder is composed of Cr-based alloy powder. The mass ratio of the Y2O3 to the CeO2 is 1: 4. Rare earth elements have special strong chemical characteristics and electronic structures, are widely applied in the aspect of improving material performance, and are called as industrial vitamins. The rare earth elements are doped in the coating, so that refining of the microstructure of the coating can be promoted, and the hardness and wear resistance of the coating are improved; the added rare earth elements can interact with coating defects and other impurity elements to initiate the change of the corrosion resistance of the coating, the rare earth doping reinforced metal ceramic composite coating can overcome various defects of coatings prepared through an existing thermal spraying technology, and the service life of a workpiece under the complex working condition is prolonged.
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