Interface-phase-including alumina fibrous fabric reinforced SiOC (silicon oxycarbide) ceramic and preparation method thereof

Abstract

The invention discloses an interface-phase-including alumina fibrous fabric reinforced SiOC (silicon oxycarbide) ceramic. The interface-phase-including alumina fibrous fabric reinforced SiOC ceramic uses a SiOC ceramic as a matrix and three-dimensional alumina fibrous fabric as a reinforcement, and a sacrificial carbon interface phase is formed between the matrix and the reinforcement. A preparation method of the interface-phase-including alumina fibrous fabric reinforced SiOC ceramic comprises the following steps of first, putting the alumina fibrous fabric into a muffle furnace for carrying out high-temperature oxidation to remove impurities; afterwards, preparing a cracking carbon coating on the surface of the alumina fibrous fabric by utilizing a chemical vapor deposition technique; preparing a precursor solution, carrying out vacuum impregnation on the alumina fibrous fabric coated with the cracking carbon coating with the precursor solution, taking out the vacuum-impregnated alumina fibrous fabric out for air-drying, carrying out low-temperature crosslinking on the air-dried alumina fibrous fabric, and then completing a one-time compaction process through high-temperature ceramization; repeatedly carrying out compaction for at least five times to prepare a SiOC ceramic intermediate product; finally, carrying out subsequent oxidation to sacrifice cracking carbon, so as to prepare a final product. The product provided by the invention is excellent in room-temperature and high-temperature mechanical properties, high in inoxidizability and low in cost, and can be molded in a near-net-size manner.

Description

technical field [0001] The invention relates to the field of fiber-reinforced ceramic materials, in particular to an alumina fiber fabric-reinforced SiOC ceramic and a preparation method thereof. Background technique [0002] SiOC ceramics have excellent thermal stability and mechanical properties. It overcomes the disadvantages of easy oxidation of carbides at high temperatures and high creep rate of oxides at high temperatures and significant reduction in mechanical properties, which has attracted the attention of the majority of material workers. The structure of SiOC ceramics can be stabilized to 1200 ° C ~ 1300 ° C, and is considered to be a good light-weight, high-temperature-resistant structural material. In addition, SiOC ceramics can also be used as protective coatings, high-temperature adhesives, optical materials, electronic packaging materials and porous ceramics, etc., and are a candidate material for structural and functional integration. [0003] Polysiloxane...

AI Technical Summary

Problems solved by technology

Due to the high porosity of the matrix, there are many oxidation channels of SiOC in the matrix, and the sealing performance and oxidation resistance of the composite material are not ideal.

In addition, the preparation process of the composite material involves steps such as ceramic slurry preparation, green body preparation, and SiOC post-densification.

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