A cement-free al2o3-si c-c based refractory castable and method of use thereof

By generating boehmite-coated nano-alumina particles in cementless Al2O3-SiC-C refractory castables and utilizing microcapsules to generate whiskers and fibers at different temperatures, the problems of low initial strength and poor high-temperature performance of cementless castables have been solved. This has resulted in improved density and strength of the material at high temperatures and extended service life.

CN119100767BActive Publication Date: 2026-05-19WUHAN UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN UNIV OF SCI & TECH
Filing Date
2024-08-09
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Existing cement-free Al2O3-SiC-C refractory castables have low initial strength, poor high-temperature performance, short service life, and complex construction process.

Method used

The cementless Al2O3-SiC-C refractory castable is composed of aggregates, matrix materials and water-reducing agents. By generating boehmite on the surface of metal powder and coating it with nano-sized alumina particles, a three-dimensional network structure of -O-Al-O- is formed. Combined with aluminum-silicon alloy, aluminum, and aluminum-silicon-iron alloy microcapsules, which rupture at different temperatures to generate whiskers and fibers, the density and strength of the material are enhanced.

Benefits of technology

It improves the medium and high temperature mechanical properties of the material, extends its service life, has high strength at room temperature, good erosion resistance and thermal shock stability, and is simple to construct. It is suitable for the working layer of molten iron trenches and molten iron ladles.

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Abstract

The application discloses a cement-free Al2O3-SiC-C refractory castable and a use method thereof. The application relates to the technical field of refractory castables. The refractory castable is composed of aggregates, matrix material and water reducing agent. The aggregates are corundum particles and silicon carbide particles. The matrix material is corundum fine powder, alpha-Al2O3 micro powder, silicon micro powder, silicon carbide fine powder, ball pitch and various metal micro capsules. The use method of the refractory castable is as follows: the water reducing agent and the matrix material are uniformly mixed to obtain premixed matrix material; the aggregates and the premixed matrix material are uniformly stirred, and then water is added and stirred to obtain slurry; the slurry is poured into a mold, vibration forming is carried out, and maintenance is carried out. The refractory castable has the advantages of high normal temperature strength, excellent medium temperature and high temperature mechanical properties, good corrosion resistance and thermal shock stability, long service life, energy saving and environmental protection, less water addition, good fluidity, stable production and suitability for positions such as iron runner, iron ladle working layer and the like.
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