An airgel composite material for high temperature insulation

A composite material and airgel technology, which is applied in the field of high-temperature heat-insulating airgel composite materials, can solve problems such as complex use environments, achieve high porosity and specific surface area, improve high-temperature heat insulation performance, and good heat insulation performance Effect

Active Publication Date: 2015-12-02
浙江格洋新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the use environment of airgel composites is complex (the use environment does not have a single temperature range, such as high temperature or low temperature), which puts forward higher requirements for the use of airgel composites, requiring them to work within a large temperature range Both have good thermal insulation properties

Method used

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  • An airgel composite material for high temperature insulation

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Experimental program
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Effect test

Embodiment 1

[0022] Doped SiO 2 The airgel composite material is distributed layer by layer from the outer surface to the inside as the first doped layer, the second doped layer and the third doped layer, and the first doped layer is carbon black-SiO 2 Airgel composite material, the particle size of carbon black is 2.7 μm, and the mass percentage of carbon black in the first doped layer is 45%; the second doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 3.2 μm, the mass percentage of SiC in the second doped layer is 80%; the third doped layer is SiC-SiO 2 In the airgel composite material, the particle size of SiC is 2.6 μm, and the mass percentage of SiC in the third doped layer is 84%.

[0023] The resulting doped SiO 2 The thermal conductivity of the airgel composite is 0.042W / m K at 300°C, 0.047W / m K at 600°C, 0.054W / m K at 900°C, and 0.054W / m K at 1200°C. The thermal conductivity is 0.058W / m·K.

Embodiment 2

[0025] The SiO2 airgel composite material is distributed layer by layer from the outer surface to the inside as the first doped layer, the second doped layer, the third doped layer and the fourth doped layer, and the first doped layer is carbon black- SiO 2 Airgel composite material, the particle size of carbon black is 2.9 μm, and the mass percentage of carbon black in the first doped layer is 42%; the second doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 3.5 μm, the mass percentage of SiC in the second doped layer is 75%; the third doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 3.1 μm, the mass percentage of SiC in the third doped layer is 81%; the fourth doped layer is SiC-SiO 2 In the airgel composite material, the particle size of SiC is 2.5 μm, and the mass percentage of SiC in the fourth doping layer is 85%.

[0026] The resulting doped SiO 2 The thermal conductivity of the airgel composite material is...

Embodiment 3

[0028] Doped SiO 2 The airgel composite material is distributed layer by layer from the outer surface to the inside and is arranged as the first doped layer, the second doped layer, the third doped layer, the fourth doped layer and the fifth doped layer, the first doped layer layer is carbon black-SiO 2 Airgel composite material, the particle size of carbon black is 2.8 μm, and the mass percentage of carbon black in the first doped layer is 43.5%; the second doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 3.4 μm, the mass percentage of SiC in the second doped layer is 77%; the third doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 3.0 μm, the mass percentage of SiC in the third doped layer is 79%; the fourth doped layer is SiC-SiO 2 Airgel composite material, the particle size of SiC is 2.8 μm, the mass percentage of SiC in the fourth doped layer is 82%; the fifth doped layer is SiC-SiO 2 In the airgel composite...

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Abstract

The invention discloses a high-temperature-insulation aerogel composite material which comprises a SiO2 aerogel and doping opacifiers, wherein 3-5 opacifier doping layers are distributed inwards layer by layer from the outer surface of the SiO2 aerogel; the opacifier used by the first doping layer, which is arranged inwards from the outermost surface of the SiO2 aerogel, is carbon black with the particle size of 2.7-2.9 mu m, and the mass percent of the carbon black in the first doping layer is 42-45%; the opacifier used by the other doping layers is silicon carbide with the particle size of 2.5-3.5 mu m, and the mass percent of the silicon carbide in each doping layer is 75-85%; and from the second doping layer, the particle size of the silicon carbide doped in the layers decreases layer by layer, and the mass percent of the silicon carbide in the current doping layer increases. The high-temperature-insulation aerogel composite material still has higher porosity and larger specific area at 1200 DEG C, and is still available at 1200 DEG C, thereby further enhancing the application temperature of the SiO2-doped aerogel composite material.

Description

technical field [0001] The invention relates to a high-temperature heat-insulating material, in particular to a high-temperature heat-insulating airgel composite material. Background technique [0002] Airgel is a typical nanoporous super-insulation material. It is a nanoporous material formed by the aggregation of nanoparticles. It has many special properties, such as high specific surface area, low density, high porosity, and low thermal conductivity. The lightest and best insulator solid material ever discovered. [0003] In the field of thermal insulation, the most researched is SiO 2 Aerogels and carbon aerogels. SiO 2 Airgel is a lightweight nanoporous material with a spatial network structure prepared by sol-gel technology and supercritical drying technology. Dense, the pore structure completely disappears above 1000°C. [0004] In order to further reduce high-temperature infrared heat radiation, opacifying agents, such as carbon black, silicon carbide (SiC), tit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
Inventor 熊菊莲
Owner 浙江格洋新材料股份有限公司
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