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Method for preparing heat-insulation materials from nano-silica filled non-graphitized carbon foam

A nano-silica, non-graphitization technology, which is applied in the field of nano-silica filled non-graphitized foam carbon to prepare thermal insulation materials, can solve the problems of inability to be used in independent blocks, poor mechanical properties of aerogels, etc. Heat convection effect, improved thermal insulation, improved full permeability effect

Inactive Publication Date: 2010-04-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a thermal insulation material filled with nano-silica and non-graphitizable foam carbon in order to solve the problem that the existing airgel has poor mechanical properties and cannot be used independently as a block.

Method used

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  • Method for preparing heat-insulation materials from nano-silica filled non-graphitized carbon foam
  • Method for preparing heat-insulation materials from nano-silica filled non-graphitized carbon foam

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specific Embodiment approach 1

[0008] Specific embodiment 1: In this embodiment, the method for preparing heat insulating material by filling non-graphitized foam carbon with nano-silica is as follows: 1. Stir and mix ethyl orthosilicate, deionized water and absolute ethanol for 10 minutes to 15 minutes to obtain Mixture, then heat the mixture to 50°C~55°C with a water bath, then add hydrochloric acid with a concentration of 0.2mol / L~0.3mol / L to continue the reaction at 50°C~55°C for 10min~15min, then drop to room temperature , then add ammonia water with a volume concentration of 98%, and react for 10min to 15min to obtain the alcohol gel; 2. Soak the alcohol gel in the aging solution for 6 hours to 10 hours at a temperature of 50°C to 55°C, and then Wash with deionized water for 10 minutes; 3. Repeat the process of step 2 3 to 4 times to obtain SiO 2 Sol-gel; 4. Immersing non-graphitizable foam carbon in SiO 2 4-6 hours in sol-gel, SiO 2 The surface of the sol-gel liquid is covered with non-graphitizabl...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that the average pore diameter of the non-graphitizable foamed carbon described in Step 3 is 500 μm-600 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the temperature of the mixture is heated to 51°C-54°C. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing heat-insulation materials from nano-silica filled non-graphitized carbon foam, and relates to a method for applying non-graphitized carbon foam to the preparation of heat-insulation materials. The method solves the problem that the prior aerogel is poor in mechanical properties and cannot be used as independent blocks. The method comprises: allowing mixture of tetraethyl orthosilicate, deionized water and absolute ethanolto react to 10 to 15 minutes under acidic and alkaline conditions respectively; soaking obtained alcogel in tetraethyl ortho-silicate ethanol solution; washing the obtained product with deionized water to obtain SiO2 sol-gel; immersing non-graphitized carbon foam in the SiO2 sol-gel; drying the obtained product; and obtaining nano-silica filled non-graphitized carbon foam heat-insulation composite material. The heat-insulation material obtained by the method can be used as independent blocks, is strong in mechanical properties compared with aerogel, and has the heat-insulation temperature between 1,200 and 1,300 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a heat insulating material by using non-graphitized foam carbon. Background technique [0002] When the hypersonic vehicle re-enters the earth's atmosphere at high speed during the transatmosphere, the large area of ​​the nose cone, the engine nozzle and even the tail cone will inevitably suffer from severe aerodynamic heating, especially for aerospace aircraft. The ascent cruise flight stage is also subject to more serious aerodynamic heating, because the aerospace plane is powered by an air-breathing engine and must accelerate in a dense atmosphere below 50 kilometers, and the orbital speed is as high as Mach 25. Therefore, the problem of anti / heat insulation has become an important issue in the development process of new aircraft. Aerogel has excellent thermal insulation properties as a super-insulator material, but its mechanical properties are so poor that it cannot be used independently as a block....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B32/00
Inventor 史丽萍赫晓东钟业盛李明伟何飞胡守亮隋超骆峰生
Owner HARBIN INST OF TECH
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