A method for preparing silicon-based ceramic materials

By forming a three-dimensional cross-linked skeleton of silicon-oxygen-aluminum covalent bonds on the surface of ceramic fibers and impregnating silica sol under secondary reduced pressure, the problems of brittle fracture and smoke pollution of inorganic ceramic fiber boards at high temperatures were solved, and the flexural strength and thermal shock stability at high temperatures were improved.

CN122167147BActive Publication Date: 2026-07-17山西阿拉丁新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
山西阿拉丁新材料有限公司
Filing Date
2026-05-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing inorganic ceramic fiberboards are prone to brittle fracture at high temperatures due to the rigid connections at fiber nodes, making it difficult to maintain high-temperature stability while obtaining sufficient flexural strength. Furthermore, the presence of organic components leads to smoke pollution.

Method used

By forming a silanol-modified layer on the surface of ceramic fibers and generating covalent bonds of silicon-aluminum oxide with polynuclear aluminum hydroxyl complexes, a three-dimensional cross-linked framework is constructed. Combined with secondary vacuum impregnation of silica sol to form an interpenetrating network, the use of organic adhesives is avoided.

Benefits of technology

This study improved the flexural strength of inorganic ceramic materials at high temperatures, avoided smoke pollution, and enhanced the toughness and thermal shock stability of the materials through heterogeneous chemical bonding.

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Abstract

This invention relates to the field of ceramic material preparation technology and discloses a method for preparing silicon-based ceramic materials, comprising: dispersing ceramic fibers and inorganic fillers to prepare a primary slurry; adding a silane coupling agent to form a silanol modification layer on the fiber surface; adding an aluminum-based inorganic flocculant to generate a polynuclear aluminum hydroxyl complex and adsorbing it onto the modification layer to obtain a composite slurry; filtration and dehydration to obtain a wet blank; inducing dehydration condensation of silanol and polynuclear aluminum hydroxyl complex in a thermal field of 90°C to 150°C, generating covalent silicon-oxygen-aluminum bonds in situ at fiber cross-nodes to construct a three-dimensional cross-linked framework; and impregnating and drying with silica sol under reduced pressure. This invention utilizes interfacial chemical bonding to replace organic adhesives, eliminating the smoking and blackening phenomena of materials under high-temperature environments, and enhancing the integrity and flexural strength of the framework structure through the microscopic condensation of polynuclear components.
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