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A kind of heat-resistant sicob airgel thermal insulation composite material and preparation method thereof

A composite material and aerogel technology, applied in the field of heat insulation materials, can solve problems such as limiting the application of SiCO airgel materials, poor high temperature oxidation resistance, and affecting heat insulation effects, so as to improve the ability to block infrared radiation at high temperatures, Effect of reducing solid-state thermal conductivity and improving high-temperature oxidation resistance

Active Publication Date: 2017-03-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiCO airgel begins to undergo carbothermal reduction reaction at around 1000 °C in the presence of oxygen, resulting in the decomposition of the airgel structure, which affects its thermal insulation effect. Zhao Nan [Zhao Nan. Journal of Silicates, 2012, 40 (10), 1473-1477], Manuel W [Manuel W.Chemistry of.Materials, 2010, 22, 1509-1520] and Chinese patent [ZL201110110947.4] reported SiCO airgel bulk materials at 1000 °C oxidized in oxygen
Low temperature resistance and poor high temperature oxidation resistance limit the application of SiCO airgel materials

Method used

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  • A kind of heat-resistant sicob airgel thermal insulation composite material and preparation method thereof
  • A kind of heat-resistant sicob airgel thermal insulation composite material and preparation method thereof
  • A kind of heat-resistant sicob airgel thermal insulation composite material and preparation method thereof

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Effect test

Embodiment 1

[0037] The product of this embodiment is made of carbon fiber and SiCOB airgel.

[0038] (1) Sol preparation: first, the molar ratio of ethyl orthosilicate, dimethyldiethoxysilane, and hydrochloric acid is 1:1:0.0025; mix and stir at room temperature for 1 hour, so that the silicon source and the carbon source are Fully hydrolyzed in the environment; then add methyl orthoborate and continue to stir for 2 hours to obtain the SiCOB precursor sol;

[0039] (2) Preparation of fiber prefabricated parts: the apparent density of the designed fiber prefabricated parts is 0.15g / cm 3 , according to mass=volume×density, calculate the fiber mass, weigh the carbon fiber, make the fiber arrangement direction perpendicular to the heat flow direction during heat insulation, clamp and fix the fiber with a mold, and obtain a carbon fiber prefabricated part;

[0040] (3) Preparation of gel / fiber preform mixture: place the fiber preform in a sealed impregnation tank, evacuate to a vacuum of 0.00...

Embodiment 2

[0045] The product of this embodiment is made of mullite fiber and SiCOB airgel.

[0046] (1) Sol preparation: first, the molar ratio of ethyl orthosilicate, dimethyldiethoxysilane, and hydrochloric acid is 1:1:0.0009; mix and stir at room temperature for 6 hours, so that the silicon source and the carbon source are Fully hydrolyzed in the environment; then add methyl orthoborate and continue to stir for 8 hours to obtain the SiCOB precursor sol;

[0047] (2) Preparation of fiber prefabricated parts: the apparent density of the designed fiber prefabricated parts is 0.25g / cm 3 , according to mass=volume×density, calculate the fiber mass, weigh the carbon fiber, make the fiber arrangement direction perpendicular to the heat flow direction during heat insulation, clamp and fix the fiber with a mold, and obtain a carbon fiber prefabricated part;

[0048] (3) Preparation of gel / fiber preform mixture: place the fiber preform in a sealed impregnation tank, evacuate to a vacuum of 0....

Embodiment 3

[0053] The product of this embodiment is made of zirconia fiber and SiCOB airgel.

[0054] (1) Sol preparation: first, the molar ratio of ethyl orthosilicate, dimethyldiethoxysilane, and hydrochloric acid is 1:1:0.0075; mix and stir at room temperature for 3 hours, so that the silicon source and the carbon source are Fully hydrolyzed in the environment; then add methyl orthoborate and continue to stir for 4 hours to obtain the SiCOB precursor sol;

[0055] (2) Preparation of fiber prefabricated parts: the apparent density of the designed fiber prefabricated parts is 0.15g / cm 3 , according to mass=volume×density, calculate the fiber mass, weigh the zirconia fiber, make the fiber arrangement direction perpendicular to the heat flow direction during heat insulation, clamp and fix the fiber with a mold, and obtain a carbon fiber prefabricated part;

[0056] (3) Preparation of gel / fiber preform mixture: place the fiber preform in a sealed impregnation tank, evacuate to a vacuum of...

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Abstract

The invention discloses a high-temperature-resistant SiCOB aerogel heat-insulation composite material and a preparation method thereof. The high-temperature-resistant SiCOB aerogel heat-insulation composite material is composed of the following components in percentage by volume: 20-70% of high-temperature-resistant inorganic ceramic fiber and 30-80% of SiCOB aerogel. The preparation method comprises the following steps: preparing a SiCOB organic precursor sol, preparing a fiber prefabricated part, and mixing the fiber prefabricated part with the sol; after the mixture gelates, aging, and carrying out supercritical drying to obtain the SiCOB aerogel composite material precursor; and carrying out pyrolytic cracking on the aerogel heat-insulation composite material precursor to obtain the high-temperature-resistant oxidation-resistant SiCOB aerogel heat-insulation composite material. The composite material has the advantages of low heat conductivity coefficient, favorable high-temperature insulation performance, obviously higher temperature resistance and obviously higher high-temperature oxidation resistance; and the maximum application temperature can reach 1500 DEG C. The preparation method has the advantages of low cost and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of heat-insulating materials, and relates to a heat-insulating composite material and a preparation method thereof, in particular to a high-temperature-resistant and oxidation-resistant SiCOB airgel heat-insulating composite material and a preparation method thereof. Background technique [0002] As the flight speed of new aerospace vehicles continues to increase and the flight time continues to prolong, the aerodynamic heating environment experienced by the aircraft is very harsh, and the cumulative aerodynamic heating on the surface is extremely serious. The thermal protection system of the aircraft has excellent mechanical properties, light weight, high temperature resistance, and efficient heat insulation There is an urgent need for advanced anti-insulation materials. [0003] Airgel thermal insulation composite material, as a new type of thermal insulation material, is favored by material researchers in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
CPCC04B28/005C04B14/38
Inventor 冯坚冯军宗姜勇刚肖芸芸阴杰
Owner NAT UNIV OF DEFENSE TECH
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