Method for preparing SiC aerogel through ultrasonic-mixing silicon source and carbon source

A technology of mixing silicon source and airgel, which is applied in the field of airgel, can solve the problems of no pores and high cost, and achieve the effects of good pore integrity, low sintering temperature, and maintenance of pore integrity and uniformity

Inactive Publication Date: 2019-02-12
江西宏柏新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problems of high cost and no pores in the existing method for preparing SiC aerogels, and provides a method for preparing SiC aerogels by ultrasonically mixing silicon sources and carbon sources

Method used

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  • Method for preparing SiC aerogel through ultrasonic-mixing silicon source and carbon source
  • Method for preparing SiC aerogel through ultrasonic-mixing silicon source and carbon source

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specific Embodiment approach 1

[0029] Embodiment 1: In this embodiment, the method for preparing SiC airgel by ultrasonically mixing silicon source and carbon source is carried out according to the following steps:

[0030] 1. Preparation of SiC precursor: Mix water glass and acid solution with a concentration of 0.5-10mol / L according to the molar ratio of 1:1.5, and stir for 10-60min under the condition of 0-50°C to make SiC Acid, using alcohol analysis method, standing at 0-50°C for 10-60min to remove sodium salt, adding carbon source, ultrasonic mixing at 30°C-50°C for 0.5-1.5h, wherein the molar ratio of water glass to carbon source 1~5:1;

[0031] 2. Preparation of SiC airgel: add ammonia water with a concentration of 0.5-5 mol / L to the liquid obtained in step 1, stir until the pH value is 8.5-11, and let stand at 0-50°C for 3-30 minutes to obtain a sol. Use micro-pressure equipment to immerse the fiber felt in the sol, let the gel stand, and perform aging and replacement under the conditions of a tem...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment is different from Embodiment 1 in that the acid described in step 1 is hydrochloric acid, sulfuric acid or nitric acid. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the alcohol used in the alcohol analysis method described in step one is one of methanol, ethanol, isopropanol, n-butanol and tert-butanol or Several mixes. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a SiC aerogel through ultrasonic-mixing a silicon source and a carbon source, relates to a preparation method for an aerogel, and belongs to the technical field of the aerogel. The method aims to solve technical problems of a current method for preparing the SiC aerogel that cost is high and no pore channel is existent. The method comprises the following steps: firstly, preparing a SiC precursor; and secondly, preparing the SiC aerogel. The method is capable of using inorganic silicon source water glass, and lower in cost. In a process of preparing the SiC, a method that ultrasonic for performing a carbon thermal reduction reaction with ultrasonic under the inert atmosphere conditions of a high-temperature furnace is used, atom interface mixing of Si and C is realized, and a distance between atoms is within a reaction free path range, so integrity and uniformity of the pore channel are kept, and the integrity of the pore channel is better.A SiC aerogel composite material prepared by the method can be made as a practically needed shape, and applied to the field of special-shaped piece application.

Description

technical field [0001] The invention relates to a preparation method of airgel, which belongs to the technical field of airgel. Background technique [0002] Airgel is a new type of material with a nanoporous structure. It is the material with the largest thermal resistance coefficient and the lowest density among the materials that have been discovered and invented so far. It is called a non-combustible thermal insulation "blue smoke". The unique three-dimensional network pore structure of silica airgel makes it have many unique properties, including high specific surface area (>1000m 2 / g), low refractive index (<1.1), low electrical conductivity (<1.7), low thermal conductivity (<0.02W / m.k), low sound propagation velocity (<100m / s), low density (<100kg / m 3 ), etc., have many applications in thermal, optics, electricity, mechanics, acoustics and other fields. [0003] Currently the most studied is SiO 2 Aerogel and C aerogel, but the service temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B30/02C04B111/40
CPCC04B30/02C04B38/0045C04B2111/40C04B14/38C04B14/386C04B14/46
Inventor 纪冠丞张磊李季
Owner 江西宏柏新材料股份有限公司
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