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Coating layer-free light ablation-resistant thermal insulation composite material and preparation method thereof

A composite material, ablation resistance technology, applied in insulation improvement, weight reduction and other directions, to achieve the effect of improving surface ablation resistance and anti-scour performance and overall structural strength, excellent thermal insulation performance, and reducing density

Active Publication Date: 2021-02-05
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems existing in the prior art, the present invention provides an uncoated lightweight ablation-resistant heat-insulating composite material and its preparation method

Method used

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  • Coating layer-free light ablation-resistant thermal insulation composite material and preparation method thereof
  • Coating layer-free light ablation-resistant thermal insulation composite material and preparation method thereof
  • Coating layer-free light ablation-resistant thermal insulation composite material and preparation method thereof

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preparation example Construction

[0028] In a first aspect, the present invention provides a method for preparing an uncoated lightweight ablation-resistant and heat-insulating composite material, the method comprising the following steps:

[0029] (1) Mix the phenolic resin and absolute ethanol evenly to obtain an initial solution, then add orthosilicate ethyl ester and distilled water to the initial solution and heat and stir evenly to obtain a mixed solution, and then add six methylenetetramine catalyst and stir evenly to obtain organic-inorganic hybrid precursor glue; in the present invention, it is preferred to add orthosilicate ethyl ester and distilled water to the initial solution and at a temperature of 40 to 60°C ( Such as 40°C, 45°C, 50°C, 55°C or 60°C), after heating and stirring for 4 to 10 hours, the hexamethylenetetramine catalyst is added; in the present invention, the initial solution is first Add tetraethyl orthosilicate and distilled water, heat and stir evenly to obtain a mixed solution, an...

Embodiment 1

[0062] ① First, dissolve the phenolic resin in absolute ethanol, and prepare an initial solution with a solid content of 40% of the phenolic resin. Then, tetraethyl orthosilicate with 40% mass of phenolic resin and distilled water with 20% mass of tetraethyl orthosilicate were added to the initial solution, and stirred at 40° C. for 10 h. Finally, a hexamethylenetetramine catalyst with 15% of the mass of the phenolic resin was added, and the organic-inorganic hybrid precursor glue was obtained after uniform stirring.

[0063] ②According to the short-term application environment where the surface of the ablation material is 800°C and the duration is ≤600s, the parameters of the multi-density prefabricated body are selected as follows: 2 layers (that is, the surface layer is a structure with a layer of quartz mesh felt between two layers of glass fiber / quartz fiber mixed woven cloth), the equivalent density is 0.9g / cm 3 , the mixed woven fabric is woven by glass fiber / quartz fi...

Embodiment 2

[0069] ① First, dissolve the phenolic resin in absolute ethanol, and prepare an initial solution with a solid content of phenolic resin of 25%. Then, tetraethyl orthosilicate with 40% mass of phenolic resin and distilled water with 20% mass of tetraethyl orthosilicate were added to the initial solution, and stirred at 60° C. for 6 hours. Finally, a hexamethylenetetramine catalyst with 15% of the mass of the phenolic resin was added, and the organic-inorganic hybrid precursor glue was obtained after uniform stirring.

[0070] ②According to the long-term application environment where the surface of the ablation material is 800°C and the duration is ≥1200s, the parameters of the multi-density prefabricated body are selected as follows: 2 layers (that is, the surface layer is a structure with a layer of quartz mesh felt between two layers of glass fiber / quartz fiber mixed woven cloth), the equivalent density is 0.6g / cm 3 , the mixed woven fabric is woven by glass fiber / quartz fib...

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Abstract

The invention relates to a coating layer-free light ablation-resistant thermal insulation composite material and a preparation method thereof. The method comprises the steps: preparing an organic-inorganic hybrid precursor glue solution by taking phenolic resin and tetraethoxysilane as main raw materials, and compounding the organic-inorganic hybrid precursor glue solution with a multi-density prefabricated body consisting of surface glass fiber / quartz fiber mixed woven cloth and a lower quartz mesh felt in a high-pressure-resistant forming mold, and through sol-gel reaction and drying at normal temperature and normal pressure, the coating layer-free light ablation-resistant thermal insulation composite material is obtained. The prepared light ablation-resistant thermal insulation composite material does not need additional coating layer protection, and has excellent ablation resistance and heat-insulating property through good temperature resistance of the organic-inorganic hybrid aerogel and a glass-phase compact protective film formed by the multi-density prefabricated body at a specific application temperature; and the composite material has huge potential in application in a thermal protection structure of a hypersonic aircraft running at a high speed for a long time in the atmosphere.

Description

technical field [0001] The invention belongs to the technical field of preparation of ablation heat protection materials, and relates to a preparation method of an ablation heat insulation composite material, in particular to an uncoated lightweight ablation resistance heat insulation composite material and a preparation method thereof. Background technique [0002] Ablation thermal protection material is a kind of special solid material, which is widely used in the field of aerospace thermal protection. Under the action of high thermal airflow, this type of material will undergo a series of complex physical and chemical changes such as decomposition, carbonization, melting, and evaporation. A large amount of heat will be taken away through the surface mass consumption of the material, and at the same time, the heat flow will be blocked from entering the interior of the material to protect the aircraft. The role of the internal structure. [0003] With the continuous develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K7/14C08K7/10
CPCC08K7/14C08K7/10C08L61/06Y02T50/40
Inventor 李健苏力军孙阔黄秀波孔德隆张杨徐春晓李文静赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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