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Method for forming silicon dioxide aerogel heat-insulating composite material

A technology of silica and composite materials, applied in the direction of silica, silica, etc., can solve problems such as low density, low strength, and large specific surface area

Inactive Publication Date: 2011-05-11
HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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AI Technical Summary

Problems solved by technology

[0003] SiO 2 Airgel is a lightweight nanoporous material, which has the advantages of low density, large specific surface area and high porosity, especially its extremely low thermal conductivity and good thermal insulation performance, which is highly valued by researchers at home and abroad. , but due to its high brittleness and low strength, it cannot be used directly as a heat insulation material, and it must be improved by strengthening and toughening to meet the needs of various forms of heat insulation

Method used

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Embodiment Construction

[0024] The heat insulation layer of a certain part is spliced ​​by multiple arc-shaped silica airgel heat insulation composite materials. The thickness of the heat insulation material is 10mm, the arc is 120°, the inner arc radius is 97mm, and the length is 240mm. According to the external dimensions of the material, the specific implementation is as follows:

[0025] 1. Plastic injection mold design

[0026] 1.1 Determination of mold cavity size

[0027] According to the external dimensions of the final thermal insulation material, considering the processing allowance and the shrinkage of the material, the height of the mold cavity is the same as the thickness of the material, the inner arc is 130°, and the length direction dimension is 250mm.

[0028] 1.2 Die structure design

[0029] The mold is mainly composed of an upper template, a lower template and a cavity, and the contact surface between the cavity and the upper and lower templates is sealed with a silicon seali...

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Abstract

The invention discloses a method for forming a silicon dioxide aerogel heat-insulating composite material. The method comprises the design of a silicon dioxide aerogel injecting mould, a formula of a silicon dioxide aerogel, a preparation method of the silicon dioxide aerogel, a method for mixing the silicon dioxide aerogel and a reinforcing material and a supercritical drying technique for enhancing the silicon dioxide aerogel. The density of the silicon dioxide aerogel heat-insulating composite material prepared by the method provided by the invention is not more than 0.4g / cm<3>; the bending strength is not less than 1.0MPa; the compression strength (10 percent of compression amount) is not less than 0.2MPa; and the heat conductivity (at the temperature of 600 DEG C) is not more than 0.04W / m.k.

Description

technical field [0001] The invention belongs to the field of forming heat-insulating composite materials, and in particular relates to a method for forming and preparing silica airgel heat-insulating composite materials. Background technique [0002] With the rapid development of modern spacecraft products, the requirements for the aerodynamic shape of each cabin are getting higher and higher, and the ablative heat-resistant materials represented by carbon / carbon, carbon / phenolic and glass / phenolic composite materials are becoming more and more Unable to meet usage requirements. The heat-proof layer + heat-insulation layer or the integration of heat-proof and heat-insulating functions will become the trend of heat protection in the future, while traditional heat-insulating materials such as foam, cork, and heat-insulating fibers have great impact on heat-insulating effects, high-temperature resistance, and mechanical properties. In terms of comprehensive performance, it is ...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 吴华利沈亚东崔西峰李月圆
Owner HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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