Silicified graphite material, silicified graphite casting mold and preparation method of silicified graphite casting mold

By adopting a combination design of a multi-stage porous graphite matrix and a silicon carbide layer in the graphite casting, the problem of poor oxidation and corrosion resistance at high temperatures is solved, and the material is high mechanical strength, excellent breathability and dimensional stability is achieved, which is suitable for the production of complex-shaped castings.

CN119839232AActive Publication Date: 2025-04-18NINGBO VULCAN TECH CO LTD
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Patent Information

Application Number
CN202510040632.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-12-31
Filing Date
2025-01-10
Publication Date
2025-04-18
Estimated Expiration
2045-01-10

AI Technical Summary

Technical Problem

Existing graphite castings have poor oxidation corrosion resistance and high brittleness at high temperatures, resulting in defects on the surface of the castings and are not suitable for the large-scale production of castings in complex shapes.

Method used

Using a multi-stage porous graphite matrix and a silicon carbide layer wrapped around its surface, the thermal stability of the material, resistance to high temperature oxidation and corrosion resistance are improved through the design of the pore structure of different sizes and the design of silicon carbide layers, and the mechanical strength and breathability of the material are enhanced.

Benefits of technology

It has achieved good high-temperature oxidation and corrosion resistance, excellent breathability, good dimensional stability and mechanical strength of silicated graphite materials, and is suitable for large-scale production of complex-shaped castings.

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Abstract

The invention provides a silicified graphite material, a silicified graphite casting mold and a preparation method of the silicified graphite casting mold, and relates to the technical field of nickel-based high-temperature alloy and titanium alloy casting. The silicified graphite material provided by the invention comprises a porous graphite matrix and a silicon carbide layer wrapping the surface of the porous graphite matrix, the porous graphite substrate has a hierarchical porous structure, the hierarchical porous structure comprises closed holes and penetrating holes, the aperture of the closed holes is 0.001-0.05 mm, the penetrating holes penetrate through the porous graphite substrate, and the penetrating holes comprise first-level penetrating holes with the aperture of 0.03-0.2 mm and second-level penetrating holes with the aperture of 0.1-1 mm; and the silicon carbide layer uniformly wraps the external surface of the hierarchical porous graphite matrix and the surfaces of the internal through holes. The silicified graphite material not only has good thermal stability and thermal conductivity, but also has good high-temperature oxidation resistance, good corrosion resistance, high mechanical strength, excellent air permeability and good dimensional stability.
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