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Biomimetic self-healing phase-change heat-absorption A1 microcapsule/ceramic-base composite heat-proof material and preparation method thereof

A technology of ceramic matrix composite and heat-proof material, which is applied in the field of biomimetic self-healing phase change endothermic Al microcapsule/ceramic matrix composite heat-proof material and preparation to achieve the effect of improving low temperature toughness

Inactive Publication Date: 2009-06-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the application of first-generation and second-generation self-healing structures to ceramic materials, especially ceramic-based thermal protection materials.

Method used

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  • Biomimetic self-healing phase-change heat-absorption A1 microcapsule/ceramic-base composite heat-proof material and preparation method thereof
  • Biomimetic self-healing phase-change heat-absorption A1 microcapsule/ceramic-base composite heat-proof material and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0028] Example 1: Pre-oxidation method

[0029] Commercial 6101 aluminum alloy powder is selected, its main components are silicon 0.3-0.7%, magnesium 0.35-0.8% and the maximum content of iron 0.5%, there are also 0.1% or less than 0.1% of elements including copper, zinc, boron , manganese and chromium.

[0030] Sieve the aluminum powder to make sure that the particle size of the aluminum powder is between 300-350 mesh, then wash the aluminum powder with alcohol, filter it with suction, dry it, and pre-oxidize it at 900°C for 1 hour to form a ceramic thin shell coating Al microcapsules.

[0031]The alumina matrix powder, basic magnesium carbonate sintering aid, and Al microcapsules coated with ceramic thin shells are prepared as raw materials according to the volume percentage ratio of 90%, 4%, and 6%, and the alumina balls are used for mixed ball milling, and the ball milling time is 2 hours After ball milling, the mixed powder material was put into a mold for compression m...

example 2

[0032] Example 2: Coating method

[0033] 1) Clean the aluminum powder, pass the aluminum powder through a 400-425 mesh sieve, then wash the aluminum powder with alcohol / acetone, suction filter, dry, add distilled water to make a dilute suspension with a mass fraction of 10%, and perform ultrasonic dispersion.

[0034] 2) After heating to the predetermined temperature, slowly add 20g / L aluminum chloride solution into the suspension within the specified time, and add ammonia water dropwise at the same time to keep the pH value of the suspension stable. After adding the aluminum chloride solution, keep the temperature at 25°C for 2 hours. Then filter, wash, dry at 110°C for 12 hours, and then heat-treat at 500°C for 3 hours to prepare alumina-coated Al microcapsule powder with an average diameter of about 50 microns. The average thickness of the aluminum oxide shell is about 1.1 microns.

[0035] 3) Ingredients: mixing the prepared alumina-coated Al microcapsule powder with al...

example 3

[0038] Example 3: Coating method

[0039] 1) Clean the aluminum powder, pass the aluminum powder through a 400-425 mesh sieve, then wash the aluminum powder with alcohol / acetone, suction filter, dry, add ethanol to make an alcohol suspension with a mass fraction of 15%, and carry out ultrasonic dispersion .

[0040] 2) According to the hydrolysis of ethyl orthosilicate, the best conditions can be obtained: TEOS: C2H5OH: H2O: NH3 = 1:10:4:1 (molar ratio), prepare silica sol, and add acetamide as an additive during the reaction process , the reaction temperature is 20°C, and the reaction time is 5h.

[0041] 3) The suspension was filtered, washed, dried at 110°C for 12 hours, and then heat-treated at 500°C for 3 hours to obtain alumina-coated Al microcapsule powder.

[0042] 3) Ingredients: The prepared Al microcapsule powder is mixed with the silicon oxide ceramic matrix powder raw material, forming aids, and sintering aids at a volume ratio of 30:60:4:6.

[0043] 4) Briquet...

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Abstract

The invention relates to a biomimetic self-healing phase-change heat-absorption A1 microcapsule / ceramic-base composite heat-proof material and a preparation method thereof, and belongs to the high temperature resistance enhanced ceramic-base biomimetic-function composite material of a microcapsule with low melting point metal Al coated by a thin ceramic shell and a preparation method thereof. The wall of the A1 microcapsule - the high temperature resistant thin ceramic shell can maintain the shape of the A1 microcapsule at a normal temperature and a high temperature; the low melting point metal Al core has the effect of self-healing similar to the effect that blood forms a scab to enclose the wound, and has the effects of phase-change heat absorption and temperature reduction similar to the effect that sweat is volatilized to reduce the temperature. The A1 microcapsule can be formed by pre-oxidizing commercial aluminum or other alloy powder and liquid-phase cladding or oxidizing in situ during the sintering process, and the composite material is molded through conventional cold pressing and pressure-less sintering or hot pressing sintering. The enhanced ceramic-base high-temperature self-healing composite material of the prepared A1 microcapsule has the advantages of light weight, strong toughness, self healing and phase-change heat absorption, thereby being used as the thermal protection material for aviation and related industries.

Description

technical field [0001] The invention relates to a phase-change heat-absorbing, high-temperature self-healing Al microcapsule reinforced ceramic-based high-temperature-resistant composite heat-proof material for reusable high-temperature heat-protection materials in the aerospace field 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 harsh e...

Claims

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Application Information

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IPC IPC(8): C04B35/76
Inventor 汪涛高操蔡雷姜子晗陶杰骆心怡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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