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Al core/Al2O-based ceramic sheath self-healing composite foam thermal protection structure simulating capillary plexus and manufacture method thereof

A technology of capillary and composite foam, applied in ceramic products, other household appliances, applications, etc.

Inactive Publication Date: 2011-06-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for open-cell aluminum foam, there is no report on the preparation of Al core / Al2O3-based ceramic sheath composite open-cell reticular foam structure by micro-arc oxidation method.

Method used

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  • Al core/Al2O-based ceramic sheath self-healing composite foam thermal protection structure simulating capillary plexus and manufacture method thereof
  • Al core/Al2O-based ceramic sheath self-healing composite foam thermal protection structure simulating capillary plexus and manufacture method thereof
  • Al core/Al2O-based ceramic sheath self-healing composite foam thermal protection structure simulating capillary plexus and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] The metal foam used as a raw material is 6101 aluminum alloy with a size of 10mm×10mm×10mm. The main components of the metal are silicon 0.3-0.7%, magnesium 0.35-0.8% and a maximum content of iron 0.5%, and elements present in amounts of 0.1% or less include copper, zinc, boron, manganese and chromium. Aluminum foam is composed of three-dimensional randomly connected metal strips, which form an open microporous structure, and the outer surface of the strip defines three-dimensional randomly connected open channels.

[0024] Put the foamed aluminum after neutral degreasing in the electrolyte solution containing 8g / L NaSiO3 and 2g / L KOH at a temperature of 25°C, and after turning on the power, adjust the current so that the current density is 7A / dm 2 , the voltage is 200-600V, after 60 minutes of treatment, cut off the power supply, take it out, wash and dry it, and you can get a foam ceramic composite material with aluminum as the core and aluminum oxide as the sheath wr...

example 2

[0026] Other steps are the same as Example 1, except that the electrolyte becomes 26g / L NaSiO3, 10g / L KF, 8g / L KOH, 24ml ethylene glycol or glycerol, and the current density is 8A / dm 2 , the voltage is 300V.

[0027] The prepared Al core / Al2O3-based ceramic sheath composite foam structure imitating the capillary plexus has the following characteristics: figure 1 Described structural features. Compression deformation is used to prefabricate cracks in the above foam structure, and then it is kept at 1100°C for 1 hour, and the molten Al at 1400°C seeps out and oxidizes to form a dense Al2O3 layer that scabs and heals the prefabricated cracks on the Al203-based ceramic sheath.

example 3

[0029] Other steps are the same as Example 1, except that the electrolyte becomes 20g / L NaAlO2, 6g / L KF, and the current density is 7A / dm 2 , the voltage is 240V.

[0030] The prepared Al core / Al2O3-based ceramic sheath composite foam structure imitating the capillary plexus has the following characteristics: figure 1 Described structural features. Compression deformation is used to prefabricate cracks in the above foam structure, and then it is kept at 1200°C for 0.5 hours, and the molten Al at 1400°C seeps out and oxidizes to form a dense Al2O3 layer that scabs and heals the prefabricated cracks on the Al2O3-based ceramic sheath.

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Abstract

An Al core / Al2O-based ceramic sheath self-healing composite foam thermal protection structure simulating capillary plexus and a manufacture method thereof belong to a low-melting-point metal core / high-temperature-resistant ceramic sheath composite material open-cell foam biomimetic structure with biomimetic self-healing function and the manufacture method thereof. The Al2O3-based high-temperature-resistant ceramic sheath simulates the capillary, and can keep foam shape at normal and high temperature; the low-melting-point metal core can be Al or other alloys with the function of blood incrustation and wound healing of similar capillary and the function of phase-change heat absorption by volatilization cooling of sweat in sweat gland. The Al core / Al2O3-based ceramic sheath composite foam structure can be manufactured from open-cell foam aluminum by microarc oxidation. The structure has the characteristics of light weight, high toughness, self healing, phase-change heat absorption and the like, and can be used for self-healing high-efficiency thermal protection system in hypersonic aerospace vehicles, reusable space launch vehicle, and relative industries.

Description

technical field [0001] The invention relates to a reusable high-temperature heat protection material in the field of aerospace and a composite foam structure imitating capillary plexus for phase transition heat absorption and high-temperature self-healing Al core / Al2O3-based ceramic sheath and a preparation method thereof. Background of the invention [0002] The re-entry flight environment of the spacecraft is very extreme and harsh. It has to withstand at least 15 minutes, and the temperature is as high as 2000K to return smoothly, which puts forward stricter requirements for the thermal protection system of the spacecraft. However, there are various factors that may cause damage to the heat-resistant material structure. For example, collisions during ground operations, ice cubes or other objects falling from spacecraft launches, and impacts of micrometeorites and space debris in space, etc., will cause damage to the heat-resistant material structure. In the extremely ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/76C04B35/10C04B38/00
Inventor 汪涛蔡雷姜子晗高操陶杰骆心怡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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