Method for preparing a ceramic protective layer on the surface of a metal or alloy material, composite material and use thereof

By coating the surface of metal or alloy materials with ceramic slurry and then performing warm isostatic pressing, decarburization, pre-sintering, and hot isostatic pressing sintering, the problems of density and bonding strength of ceramic protective layers are solved, and high-quality ceramic protective layers are prepared for use in solid oxide fuel cell connectors.

CN118002452BActive Publication Date: 2025-12-12ANHUI YISHITONG MATERIALS SCI RES INST CO LTD
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Patent Information

Application Number
CN202311836758.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-28
Publication Date
2025-12-12
Estimated Expiration
2043-12-28

AI Technical Summary

Technical Problem

Existing technologies for preparing ceramic protective layers suffer from problems such as high porosity, poor bonding strength with the substrate, and unevenness of the protective layer, leading to detachment or substrate corrosion, which affects the yield and performance.

Method used

The process involves coating the surface of a metal or alloy material with a ceramic slurry followed by warm isostatic pressing, combined with decarburization, pre-sintering, and hot isostatic pressing sintering. Components such as strontium lanthanum manganate powder, manganese trioxide, binder, and dispersant are used. The viscosity and proportion of the binder are controlled to form continuous closed pores and improve density.

Benefits of technology

A ceramic protective layer with high density and good bonding strength was prepared, which reduced the impact of pores and improved the yield and performance.

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Abstract

The application discloses a method for preparing a ceramic protective layer on a metal or alloy material surface, a composite material and application thereof, relates to the technical field of ceramic protective layers, and comprises the following steps: S1, coating ceramic slurry on the surface of the metal or alloy material, and performing warm isostatic pressing treatment after drying to obtain a protective layer green body; and S2, sequentially performing decarburization, pre-sintering and hot isostatic pressing sintering on the protective layer green body prepared in the step S1 to obtain a ceramic protective layer. The application additionally adds manganese sesquioxide in the ceramic slurry, and the addition of the manganese sesquioxide is beneficial to forming continuous closed pores in the protective layer green body in the low-temperature pre-sintering process, so that the protective layer sintering is not caused to be not dense due to the through holes in the subsequent hot isostatic pressing sintering process; and the pre-sintering and geometric hot isostatic pressing sintering mode is adopted to reduce the influence of the open pores in the protective layer, so that the density of the finally obtained ceramic protective layer is improved.
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Citation Information

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