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Sandwich structure thermal protection material with high panel strength and making method thereof

A heat protection material and sandwich structure technology, applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as flight reliability risk, poor strain coordination performance, easy bump damage, etc., to achieve improved panel Density and mechanical strength, as well as strain coordination performance, improved overall stability, and non-destructive effects

Active Publication Date: 2018-06-05
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN2012101204420 mentions a sandwich structure heat-proof material and its preparation scheme, but this method only uses ceramic precursor sol for impregnation and high-temperature treatment, and does not use organic resin coating for protection treatment, and there is still a lack of strain coordination performance. For example, it is easy to be bumped and damaged during assembly and transportation, so there is a risk in flight reliability

Method used

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  • Sandwich structure thermal protection material with high panel strength and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of quartz / silica sandwich structure thermal protection material with 45% concentration ceramic precursor

[0045] (1) Preparation of sandwich structure preform: first prepare aerogel composite heat insulation material with a size of 320*320*25mm, and then use ethoxytriethylsilane for hydrophobic treatment, and perform mechanical processing and perforation. Spread 2mm quartz fiber fabric and 0.5mm quartz fiber fabric on the upper and lower surfaces, and perform integrated stitching to complete the preparation of sandwich structure preform, the size is about 320*320*27.5mm.

[0046] (2) Ceramic precursor configuration: First, use a rotary evaporator to evaporate 25% silica sol until the concentration is 45% (the average particle size of the colloidal particles is 800 nm), and let it stand for use.

[0047] (3) Densification: Put the preform in a closed mold, vacuum to 0.1MPa, immerse 45% of the ceramic precursor into the mold, immerse for 24h, take it out, put it int...

Embodiment 2

[0051] Preparation of Quartz / Silicon Oxide Sandwich Structure Thermal Protection Material with 30% Concentration Ceramic Precursor

[0052] (1) Preparation of sandwich structure preform: the same as in Example 1.

[0053] (2) Ceramic precursor configuration: First, use a rotary evaporator to evaporate 25% of the silica sol until the concentration is 30% (the average particle size of the colloidal particles is 600 nm), and let it stand for use.

[0054] (3) Densification: Place the preform in a closed mold, vacuum, immerse 30% of the ceramic precursor in the mold, immerse it for 24 hours, take it out, put it into the fixture with holes on the upper and lower plates, shape it, and place it with the fixture In an oven, dry at 120°C for 8 hours. Repeat the above operation until the weight gain rate is less than 1% (repeated 8 times).

[0055] (4) Sintering and machining: same as Example 1.

[0056] The size of the obtained outer heat protection material is 300mm×300mm×27.5mm, the room tem...

Embodiment 3

[0058] Preparation of Quartz / Silicon Oxide Sandwich Structure Thermal Protection Material with 20% Concentration Ceramic Precursor

[0059] (1) Preparation of sandwich structure preform: the same as in Example 1.

[0060] (2) Ceramic precursor configuration: take a certain amount of deionized water, dilute 25% silica sol to 20% (the average particle size of colloidal particles is 150nm), and let it stand for use.

[0061] (3) Densification: Place the preform in a closed mold, vacuum, immerse 20% of the ceramic precursor into the mold, immerse it for 24 hours, take it out, put it into the fixture with holes on the upper and lower plates, shape it, and place it with the fixture. In an oven, dry at 120°C for 8 hours. Repeat the above operation until the weight gain rate is less than 1% ((repeated 18 times)).

[0062] (4) Sintering and machining: same as Example 1.

[0063] The size of the obtained outer heat protection material is 300mm×300mm×27.5mm, the room temperature compressive stre...

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Abstract

The invention relates to a thermal protection material with high panel strength and a making method thereof. The method comprises the following steps: (1) preparing a sandwich structure prefabricatedmember; (2) carrying out primary densification, namely steeping the sandwich structure prefabricated member in a non-positive pressure condition by using a low-density ceramic precursor solution, andthen drying to constant weight, to obtain a primarily densified prefabricated member; (3) carrying out secondary densification, namely repeating the step of primary densification until weight gain rate is lower than 1.0%, to obtain a secondarily densified prefabricated member; and (4) sintering. The invention also provides a thermal protection material prepared by adopting the method. According tothe method disclosed by the invention, low-density and non-pressure steeping are organically combined, the high-efficiency compounding of a fiber bundle and a ceramic precursor is realized, and the panel density and strength are increased; the method fuses conventional processes, is simple and easy to operate, cannot damage aerogel easily in comparison with pressure steeping, and the quality stability can be improved.

Description

Technical field [0001] The invention relates to a method for improving the strength of a sandwich structure heat protection material panel and a heat protection material prepared by the method, and belongs to the technical field of aerospace heat protection. Background technique [0002] In the field of aerospace materials, in order to solve the brittleness problem of aerospace insulation tiles, domestic experts have innovatively proposed sandwich structure thermal protection materials. This type of material has excellent strain coordination, resistance to aerodynamic erosion and heat insulation, and has achieved great The size preparation and assembly method are simple, which improves the design margin and safety and reliability. [0003] The sandwich structure heat protection material is made of core insulation material and upper and lower ceramic panels through integrated stitching. The core insulation material is made of flexible cotton felt composite aerogel insulation filler,...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B38/16B32B38/08B32B3/24B32B33/00
CPCB32B3/266B32B5/024B32B5/06B32B9/00B32B9/047B32B33/00B32B38/0036B32B38/08B32B38/164B32B2260/021B32B2307/304B32B2307/72B32B2307/558B32B2605/18
Inventor 苏力军李文静宋寒张丽娟张凡刘斌裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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