High thermal shock resistant and erosion resistant aluminosilicate castable refractory and its construction method

By constructing a composite structure of an inner prestressed support and a surface dense ceramic protective layer, combined with a microporous network and a self-generated glaze layer, the problems of thermal shock resistance, erosion resistance and scouring resistance of aluminosilicate refractory castables under suspension calcination conditions were solved, and the material was able to achieve long-term stable service under extreme conditions.

CN122404004APending Publication Date: 2026-07-17ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202610553714.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing aluminosilicate refractory castables are difficult to improve thermal shock resistance, corrosion resistance and erosion resistance in a synergistic way under extreme conditions such as suspension calcination. Traditional measures to introduce pores actually accelerate chemical corrosion, and the contradiction between density and thermal shock resistance is difficult to resolve.

Method used

By designing the components, an inner tough prestressed support and a dense ceramic protective layer are constructed. Combined with a microporous network, anti-corrosion active components such as zircon micro powder and chromium oxide green are used, along with multi-level pore-forming agents, to form a mullite whisker interwoven structure and a self-generated glaze layer, thereby achieving dynamic stress compensation and surface repair.

Benefits of technology

It significantly improves the material's thermal shock resistance, corrosion resistance, and erosion resistance during high-temperature service, and possesses dynamic stress adjustment and self-renewal capabilities, thus resolving the performance contradictions of the material under extreme working conditions.

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Abstract

This invention discloses a highly thermally shock resistant and corrosion-resistant aluminosilicate refractory castable and its construction method, belonging to the field of refractory materials technology. The castable comprises refractory aggregate, matrix powder, binder, corrosion-resistant active component, micropore-forming component, and self-generating glazing component. Its core lies in constructing an inner prestressed field through the thermal expansion mismatch between aggregate and matrix and the zirconium oxide phase transformation, utilizing a two-graded pore-forming agent to form a multi-scale microporous network to buffer thermal stress, and leveraging the self-generating glazing component to generate a dense ceramic glaze layer in situ on the surface during high-temperature service. This structural design systematically and synergistically improves the material's thermal shock resistance, chemical corrosion resistance, and mechanical erosion resistance. This invention is particularly suitable for extreme working conditions such as coal gangue suspension calcining furnaces, which combine high temperature, thermal shock, erosion, and chemical corrosion.
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