A kind of silicon carbide aerogel and preparation method thereof

Abstract

The present invention discloses a silicon carbide aerogel, which is prepared from polycarbosilane containing Si-H bond, divinylbenzene, a Pt catalyst and an organic solvent by a polymer precursor conversion ceramic preparation method and aerogel preparation method. The silicon carbide aerogel has a specific surface area of 50-400 m<2> / g, a porosity of 70-90% and density of 0.1-0.2 g / mL; the mass ratio of polycarbosilane to divinylbenzene is 1:08-1.2; and the Pt catalyst accounts for 0.1-0.5% of the total weight of polycarbosilane and divinylbenzene. The method utilizes polymer precursor conversion ceramic preparation method for preparation of SiC aerogel, and the conversion temperature is as low as 800 DEG C. The obtained SiC aerogel has low oxygen content, high purity, good quality, and controllable porosity and density; and the process is simple and controllable.

Description

technical field

[0001] The invention belongs to the technical field of airgel, and in particular relates to a silicon carbide airgel and a preparation method thereof. Background technique

[0002] Airgel usually refers to a lightweight nano-solid material, a skeleton, in which nano-scale particles aggregate to form a nano-porous network mechanism. The particle diameter is 1-20nm, the pore size is 2-100nm, and the porosity is as high as 90%. The special structure makes it have the advantages of light weight and high-efficiency heat insulation at the same time, and can be widely used in the fields of heat, light, sound, electricity, mechanics, etc., and has attracted extensive attention from the scientific research and industry circles. One of the most promising materials in the century. At present, the most studied are mainly SiO2 aerogels and C aerogels, SiO2 2 When airgel and its composite materials are used above 800°C, the thermal insulation performance drops sharply, ...

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