Silicon carbide foamed ceramics and preparation method thereof

Abstract

The invention discloses silicon carbide foamed ceramics which comprises the following raw materials in parts by weight: 80-95 parts of silicon carbide micro powder particles, 5-20 parts of polycarbosilane powder and 40-170 parts of organic solvent. A template of the silicon carbide foamed ceramics is made of polymeric sponge. According to the invention, by using the characteristic that the polycarbosilane can be dissolved in the organic solvent, the polycarbosilane and ceramic powder are made into organic solvent slurry, polyurethane foam is dipped in the organic solvent slurry through adopting a powder sintering process principle, and thermally oxidized so that the yield of polycarbosilane ceramics is increased, the silicon carbide foamed ceramics is prepared through sintering under an inert atmosphere. A preparation method has the advantages of low sintering temperature, high efficiency and high production purity, and effectively avoids the difficulties of complex procedures, too many introduced impurities and high sintering temperature of the traditional preparation method for preparing the silicon carbide foamed ceramics.

Description

technical field [0001] The invention relates to a functional material and a preparation method thereof, in particular to a silicon carbide foamed ceramic. Background technique [0002] As a new type of functional material, silicon carbide foam ceramics has light weight, high dielectric constant, large specific surface area, excellent chemical resistance, and can be used for a long time in harsh environments. It is widely used in aerospace, electronics, biomedicine, metallurgy , composite materials and other fields have broad application prospects. [0003] At present, silicon carbide foam ceramics are prepared by the following four methods: powder sintering method, solid state reaction sintering method, silicon resin pyrolysis method and vapor deposition method. The powder sintering method is to adjust the silicon carbide micropowder containing a certain amount of sintering aid and the linking agent into a slurry with a suitable concentration, then use polyurethane foam to ...

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Problems solved by technology

Because the first three methods do not have a hot pressing process, the initial density is not high, the prepared foamed ceramics are not dense, the strength is low, and the pore volume and size of the solid-state reaction sintering method and the silicon-containing resin pyrolysis method are difficult to control; while the vapor deposition method costs higher, less efficient

Due to the above problems, the wide application of silicon carbide foam ceramics is restricted

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