Preparation method of heat-resistant and erosion-resistant heat protection material for high-temperature wind tunnel

By preparing a thermal protection material combining multi-level mullite fibers with aluminosilicate sol, the problem of poor performance of existing materials in high-temperature wind tunnel experiments was solved, achieving high strength, erosion resistance, thermal shock resistance, and low thermal conductivity, making it suitable for wind tunnel experiments of hypersonic vehicles.

CN118047598BActive Publication Date: 2026-06-12SINOSTEEL LUOYANG INSTITUTE OF REFRACTORIES RESEARCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SINOSTEEL LUOYANG INSTITUTE OF REFRACTORIES RESEARCH CO LTD
Filing Date
2024-03-20
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing wind tunnel experiments of hypersonic vehicles, existing thermal insulation materials have poor performance under high temperature conditions. In particular, SiO2 fiber composite materials have a low safe service temperature, multi-layer stainless steel plate thermal insulation materials are not suitable for large-sized components and are prone to oxidation, and corundum brick composite materials have poor thermal shock resistance and short service life.

⚗Method used

A multi-level structure thermal protection material preparation method is adopted. By combining mullite fibers with aluminosilicate sol to generate nano-mullite particles, a bicontinuous phase structure is formed. Combined with hot pressing, a thermal protection material with a multi-scale structure is prepared.

🎯Benefits of technology

The prepared material has high strength, erosion resistance, thermal shock resistance, and low thermal conductivity, and can remain stable in high-temperature environments, thus extending its service life.

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Abstract

The application relates to a preparation method of an erosion-resistant and thermal shock-resistant thermal protection material for a high-temperature wind tunnel, wherein the thermal protection material is composed of multi-stage structure units with lengths ranging from nanometers to centimeters; centimeter-level mullite fibers and micron mullite powder are uniformly dispersed in water, and pressure filtration forming is carried out; after drying, alumina-silica sol is poured into the blank, drying is carried out, pouring and drying are cyclically carried out for multiple times; the finally dried sample is subjected to high-temperature hot pressing treatment, and the erosion-resistant and thermal shock-resistant thermal protection material can be obtained; during the hot pressing treatment process, nano silicon oxide particles and nano aluminum oxide particles in the alumina-silica sol generate nano mullite particles in situ; the prepared thermal protection material is composed of the double continuous phase structure of the mullite fibers and the nano mullite particles, and the micron mullite powder is island-like distributed in the double continuous phase structure. The prepared thermal protection material has the performances of erosion resistance, thermal shock resistance, low thermal conductivity and long-time service at a high temperature.
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