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A kind of anti-ablation high-barrier flexible heat-proof soft skirt and preparation method thereof

An anti-ablation and high-barrier technology, which is applied in chemical instruments and methods, thermal protection devices for aerospace vehicles, transportation and packaging, etc., can solve the problems of reduced sealing performance, large overall thickness, and large single-layer thickness, etc., to achieve guaranteed Anti-ablation, good barrier air tightness, and the effect of reducing the overall thickness

Active Publication Date: 2020-01-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing structure is generally composed of 16 to 30 layers of silicone rubber layers with a thickness of 1 to 2.0 mm. The first two thirds are usually ablated. Too much, resulting in a large overall thickness, generally around 30mm. The weight of the soft skirt is too large, which will have a certain impact on the swing of the nozzle. At the same time, the thickness of the single layer is too large, which is easy to form cracks, the sealing performance is reduced, and the reliability is low.

Method used

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  • A kind of anti-ablation high-barrier flexible heat-proof soft skirt and preparation method thereof
  • A kind of anti-ablation high-barrier flexible heat-proof soft skirt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Soft skirt structure:

[0044] 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 thickness of each layer is 1.25mm; the flexible anti-radiation layer is made of 0.05mm aluminum foil; the flexibility is high The barrier layer has 3 layers, and the thickness of each layer is 0.2mm; the total thickness of the soft skirt is 5.8mm.

[0045] Concrete preparation process is as follows:

[0046] 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 into the mixture respectively, 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 vulcanized at 160-180°C after coating to obtain a silicone rubber-coated fabric. Then prepare aluminum foil with a thickness of 0.05 mm. After ...

Embodiment 2

[0049] Soft skirt structure:

[0050] The flexible anti-ablation layer has 3 layers, the content of phenolic resin in the flexible anti-ablation layer is 30%, 15%, 10%, and the thickness is 1.4mm; the flexible anti-radiation layer is made of 0.05mm aluminum foil; the flexible high barrier layer is 3 layers, each Layer thickness 0.2; total thickness 4.95 mm.

[0051] The preparation process is the same as in Example 1.

[0052] The soft skirt prepared in this example is tested for ablation resistance and air tightness according to the relevant national standards 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 the ablation, inspection found that the surface of the first flexible high-barrier layer had slight ablation marks, and the remaining two flexible high-barrier layers had no ablation, and the airtightness was intact.

Embodiment 3

[0054] Soft skirt structure:

[0055] 5 layers of flexible anti-ablation layer, the content of phenolic resin in the flexible anti-ablation layer is 25%, 20%, 15%, 10%, 5%, and the thickness is 1.0mm; the flexible anti-radiation layer is made of 0.05mm aluminum foil; the flexibility is high The barrier layer has 3 layers, and the thickness of each layer is 0.2mm; the total thickness is 5.85mm.

[0056] The preparation process is the same as in Example 1.

[0057] The soft skirt prepared in this example is tested for ablation resistance and air tightness according to the relevant national standards 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 the ablation inspection, it was found that the flexible high barrier layer was intact, no ablation was seen, and the airtightness was intact.

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Abstract

The invention provides an anti-ablation high-resistance flexible heatproof soft skirt and a preparing method thereof. The soft skirt is composed of a plurality of flexible anti-ablation layers, a plurality of flexible anti-radiation layers and a flexible high-resistance layer. The flexible anti-ablation layers and the flexible anti-radiation layers are distributed alternately from outside to inside according to the structure of S-F-S-F-...-S-F, wherein S is flexible anti-ablation layer and F is flexible anti-radiation layer. The flexible high-resistance layer is located on the innermost side.The flexible anti-ablation layers, the flexible anti-radiation layers and the flexible high-resistance layer are attached to an installation spraying pipe through a silicone rubber adhesive. The flexible anti-ablation layers and the flexible anti-radiation layers are distributed alternately on the outer layer, the synergistic effect between the flexible anti-ablation layers and the flexible anti-radiation layers is given to full play, a phenolic resin modified silicone rubber system is adopted for the flexible anti-ablation layers, the anti-ablation performance of the flexible anti-ablation layers is improved, and on the basis of ensuring the anti-ablation performance, the total thickness of the soft skirt is effectively reduced, and the total thickness reduction amount is 1 / 2 to 2 / 3 of that of an existing structure.

Description

technical field [0001] The invention relates to an ablation-resistant high-barrier flexible heat-resistant soft skirt and a preparation method thereof, belonging to the technical field of ablation-resistant composite materials. Background technique [0002] Rocket and other aerospace vehicle engines will eject high-temperature flames and gas streams when they are ignited, and the instantaneous temperature reaches 3000K-4000K. figure 2 As shown, the nozzle flame can flow back and burn to the outside of the engine heat shield, and the part near the tail compartment equipment is the inside of the engine heat shield. The engine heat shield is installed on the nozzle flange of the engine tail nozzle Between it and the rear end cover, it can effectively prevent the engine jet flame from flowing back into the cabin to burn the equipment, and block the return flame from entering the cabin. The additional stress in the tail cabin of the ascending section is increased due to the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64G1/58B32B17/02B32B17/06B32B15/20B32B7/12B32B33/00B32B37/02B32B37/12D06M15/643D06M15/41
CPCB32B5/26B32B7/12B32B15/14B32B15/20B32B33/00B32B37/02B32B37/12B32B2038/0076B32B2255/02B32B2255/26B32B2262/101B32B2270/00B32B2307/304B32B2307/3065B32B2307/7242B32B2605/18B64G1/58D06M15/41D06M15/643
Inventor 柯红军夏雨王国勇嵇培军许孔力
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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