A kind of flexible inflatable heat shield and preparation method thereof

A heat shield and flexible technology, applied in the field of flexible inflatable heat shield and its preparation, can solve the problems of thick flexible heat insulation material, difficult to fold and store, heavy weight, etc., and achieve good ablation resistance and easy folding of the material , the effect of repairing holes and cracks

Active Publication Date: 2019-12-10
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the thickness of the flexible heat insulation material used in this structure is relatively large, generally the thickness of 30-50mm can play a good role, so it leads to heavy weight, thick thickness, and is not easy to fold and store

Method used

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  • A kind of flexible inflatable heat shield and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Flexible Inflatable Heat Shield:

[0046] 4 layers of flexible anti-ablation layer, the content of phenolic resin in the flexible anti-ablation layer is 30%, 20%, 10%, 5%, respectively, and the content of nano-ceramic powder is 3%, 2.5%, 1.5%, 0.5%, each The thickness of the layer is 1.5mm; the flexible anti-radiation layer is made of 0.05mm aluminum foil; the flexible high-temperature-resistant airtight layer has 3 layers, and the thickness of each layer is 0.2mm.

[0047] Concrete preparation process is as follows:

[0048] Stir and mix 100 parts of HTV-1 methyl vinyl silicone rubber and 5 parts of benzoyl peroxide (BPO) evenly. Add 0%, 5%, 10%, 20%, 30% phenolic resin and 0, 0.5%, 1.5%, 2.5%, 3% nano-ceramic powder to the mixture to form nano-boron carbide with a particle size of 60 nanometers , mix well and set aside. Then choose the area density as 200g / m 2 The glass fiber plain weave cloth is double-sided coated on a silicone rubber coating machine, and vulcan...

Embodiment 2

[0051] Flexible Inflatable Heat Shield:

[0052] There are 3 layers of flexible anti-ablation layer, the content of phenolic resin in the flexible anti-ablation layer is 30%, 15%, and 10% respectively, the nano-ceramic powder is nano-silicon carbide, the particle size is 80 nanometers, and the content is 3% and 2% respectively .

[0053] The preparation process is the same as in Example 1.

[0054] The flexible inflatable heat shield prepared in this example is tested for ablation resistance and air tightness according to the relevant national standard of GJB2620-96. The ablation test conditions are: the heat flux in the first 70 seconds is 167.47KW / m 2 , the heat flux in the last 60 seconds is 376.81KW / m 2 , After ablation, inspection found that the surface of the first layer of flexible high-temperature-resistant airtight layer had slight ablation marks, and the remaining two layers of flexible high-temperature-resistant airtight layers had no ablation, and the airtightnes...

Embodiment 3

[0056] Flexible Inflatable Heat Shield:

[0057] There are 5 layers of flexible anti-ablation layer. The content of phenolic resin in the flexible anti-ablation layer is 25%, 20%, 15%, 10%, and 5%. The nano-ceramic powder is nano-zirconia with a particle size of 70 nanometers. 3%, 2.5%, 2%, 1.5%, 1%, with a thickness of 1mm; the flexible anti-radiation layer is made of 0.05mm aluminum foil; the flexible high-temperature-resistant airtight layer has 3 layers, and the thickness of each layer is 0.2mm.

[0058] The preparation process is the same as in Example 1.

[0059] The flexible inflatable heat shield prepared in this example is tested for ablation resistance and air tightness according to the relevant national standard of GJB2620-96. The ablation test conditions are: the heat flux in the first 70 seconds is 167.47KW / m 2 , the heat flux in the last 60 seconds is 376.81KW / m 2 , Inspection after ablation found that the flexible high-temperature-resistant airtight layer was ...

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Abstract

The invention provides a flexible inflating heat shield and a preparation method thereof. The flexible inflating heat shield is composed of a plurality of flexible anti-ablation layers, a plurality offlexible anti-radiative layers and a flexible high-temperature-resistant airtight layer, wherein the flexible anti-ablation layers and the flexible anti-radiative layers are distributed alternately in a structure of S-F-S-F...-S-F structure from outside to inside, S is the flexible anti-ablation layer, F is the flexible anti-radiative layer, the flexible high-temperature-resistant airtight layeris located on the innermost side, and the flexible anti-ablation layers, the flexible anti-radiative layers and the flexible high-temperature-resistant airtight layer are adhered by means of a silicone rubber adhesive. By adding a proper amount of phenolic resin and nano ceramic powder into a silicon rubber system, a silicone rubber coated fabric is vitrified at a high temperature while keeps theflexibility, so that the anti-ablation property is improved remarkably, the number and thickness of layers of the anti-ablation layers are reduced effectively, and the flexible inflating heat shield has a good folding property.

Description

technical field [0001] The invention relates to a flexible inflatable heat shield and a preparation method thereof, belonging to the technical field of ablation-resistant composite materials. Background technique [0002] With the rapid development of aerospace technology, the development of large-scale, high-tonnage reentry vehicles has attracted widespread attention at home and abroad. Rockets, missiles, spacecraft and other aircraft have high operating temperatures, generally above 2000K, and aerodynamic heating or power flames produce The heat flow and high temperature of the spacecraft have exceeded the range that the material can withstand, and effective thermal protection must be carried out. The efficient thermal protection technology of spacecraft has gradually become one of the key technical bottlenecks restricting its development. The aerodynamic configuration and thermal protection structure of traditional reentry spacecraft mostly adopt fixed rigid structures, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B15/14B32B15/20B32B33/00B32B37/12D06N3/00D06N3/10
CPCB32B5/02B32B15/14B32B15/20B32B27/06B32B33/00B32B37/12B32B2255/02B32B2255/26B32B2307/212B32B2307/304B32B2307/306B32B2307/3065B32B2307/546B32B2307/7242B32B2605/18D06N3/0063D06N3/106D06N2203/06D06N2205/10D06N2209/06D06N2209/067D06N2209/143D06N2209/1642D06N2209/1692D06N2213/02
Inventor 柯红军夏雨王国勇
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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