High-temperature oxidation-resistant ceramic aerogel and preparation method thereof

By coating silicon carbide and zirconium carbide precursors onto silicon nitride aerogel nanostructures, a silicon dioxide and zirconium dioxide coating is formed, which solves the problem of easy oxidation and failure of silicon nitride aerogel in high-temperature oxygen-containing environments. This achieves low-cost large-scale preparation and improved high-temperature oxidation resistance, making it suitable for thermal insulation in aerospace, high-temperature kilns and fire-fighting equipment.

CN118955165BActive Publication Date: 2026-06-26SHAANXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411024549.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-29
Publication Date
2026-06-26
Estimated Expiration
2044-07-29

AI Technical Summary

Technical Problem

Existing silicon nitride aerogels are prone to oxidation and failure in high-temperature and oxygen-rich environments, and are difficult to prepare on a large scale at low cost, which limits their application in aerospace, high-temperature kilns and fire-fighting equipment.

Method used

Using one-dimensional silicon nitride nanowires and two-dimensional silicon nitride nanoribbons as the main components, silicon carbide and zirconium carbide precursor coatings are coated on the nanostructures. In-situ ceramic coatings are formed to create silicon dioxide and zirconium dioxide coatings, forming a dense eutectic liquid film to block oxygen and improve oxidation resistance.

Benefits of technology

It significantly improves the high-temperature oxidation resistance and elasticity of silicon nitride aerogel, enabling low-cost large-scale preparation, and is suitable for thermal insulation in aerospace, high-temperature kilns and fire-fighting equipment.

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Abstract

The application discloses a high-temperature oxidation-resistant ceramic aerogel and a preparation method thereof, and belongs to the technical field of ceramic aerogels.The main body of the high-temperature oxidation-resistant ceramic aerogel is a silicon nitride aerogel, the nanostructure of the silicon nitride aerogel is one of one-dimensional silicon nitride nanowires and two-dimensional silicon nitride nanobands or a combination of the two nanostructures, and the nanostructure of the silicon nitride aerogel is sequentially coated with a silicon carbide precursor coating and a zirconium carbide precursor coating from inside to outside.The application can solve the defects that traditional ceramic aerogels are prone to oxidation failure under superhigh temperature and are difficult to be prepared at low cost and in large scale.
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