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A kind of micro-nano multi-scale nano heat insulation material and its preparation method

A nano-insulation material and multi-scale technology, applied in the field of functional composite materials, can solve problems such as insufficient temperature resistance, and achieve the effects of good regulation, low thermal conductivity, and high safety

Active Publication Date: 2022-01-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of insufficient temperature resistance in the preparation of nano-insulation materials by the existing sol-gel method and molding method, the present invention provides a micro-nano multi-scale nano-insulation material and its preparation method

Method used

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Examples

Experimental program
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preparation example Construction

[0026] In the first aspect, the present invention provides a method for preparing a micro-nano multi-scale nano-insulation material, the method comprising the following steps:

[0027] (1) mix the nanopowder and the micropowder evenly to obtain the micronanopowder; in the present invention, the nanopowder is also denoted as nanoparticles or nanopowder particles; the micronpowder is also denoted as As micron particles or micron powder particles;

[0028] (2) Mix the micro-nano powder, inorganic fibers and additives evenly to obtain a mixture (fiber / powder material);

[0029] (3) Spreading and molding the mixed material (molding assembly) to obtain a micro-nano multi-scale nano-insulation material; in the process of spreading the material, it is necessary to ensure that the material is spread evenly in the mold.

[0030] At present, the general understanding of thermal insulation materials in the prior art is that common high-performance thermal insulation materials generally h...

Embodiment 1

[0056] Example 1: Preparation of nano-silica powder / micro-silica powder / quartz fiber micro-nano multi-scale nano-insulation material

[0057] S1. According to the ratio of nano silica powder: micron silica powder: quartz fiber: silicon carbide = 500: 200: 100: 50 (mass ratio), the materials are weighed respectively and set aside; the nano silica powder is The powder with a particle size between 1 and 50nm is used, the micron silica powder uses a powder with a particle size between 1 and 10um, and the quartz fiber uses a powder with a diameter between 1 and 10um of quartz fibers;

[0058] S2. The micron silica powder is gradually added into the container containing the nano silica powder under the action of the mechanical fusion equipment, and fully mixed evenly to obtain the micronano powder;

[0059] S3. Add quartz fiber and silicon carbide additives to the mixed micro-nano powder, and continue to mix evenly to obtain fiber / powder material for use;

[0060] S4. Lay the mixe...

Embodiment 2

[0065] Example 2: Preparation of nano-silica powder / micro-alumina powder / alumina fiber micro-nano multi-scale nano-insulation material

[0066] S1. According to the ratio of nano silica powder: micron alumina powder: alumina fiber: silicon carbide = 500: 150: 150: 40 (mass ratio), the materials are weighed respectively and set aside; the nano silica powder is The powder with a particle size between 1 and 50nm is used, the micron alumina powder uses a powder with a particle size between 1 and 10um, and the alumina fiber uses a powder with a diameter between 1 and 10um alumina fiber;

[0067] S2. The micron alumina powder is gradually added into the container containing nano-silica powder under the action of mechanical fusion equipment, and fully mixed evenly to obtain micro-nano powder;

[0068] S3. Add alumina fiber and silicon carbide additives to the mixed micro-nano powder, and continue to mix evenly to obtain fiber / powder material for use;

[0069] S4. Lay the mixed fibe...

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Abstract

The invention relates to a micro-nano multi-scale nano heat insulation material and a preparation method thereof. The method includes: (1) uniformly mixing nano powder and micron powder to obtain a micro-nano powder; (2) uniformly mixing the micro-nano powder, inorganic fibers and additives to obtain a mixture; (3) ) paving and molding the mixture to prepare a micro-nano multi-scale nano-insulation material. The method of the invention realizes the interpenetration of the micro-nano powder in the microstructure by rationally designing the size specifications of the micro-nano powder and the nano-powder, and improves the high-temperature structural stability of the nano-insulation material.

Description

technical field [0001] The invention relates to the technical field of functional composite materials, in particular to a micro-nano multi-scale nano-insulation material and a preparation method thereof. Background technique [0002] At present, the methods for preparing nano-insulation materials mainly include sol-gel method and compression molding method. The preparation of nano-insulation materials by sol-gel method mainly includes precursor hydrolysis, precursor gel, gel solvent replacement, and gel supercritical drying. Such steps are chemical reactions. The active hydroxyl formed after the hydrolysis of the precursor is difficult to completely condense under the given conditions of the gel, but the active site will undergo condensation and dehydration at a higher temperature. The macroscopic manifestation is an airgel The skeleton shrinks and collapses, and the thermal insulation performance drops sharply at this temperature. The preparation of nano-insulation materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/80C04B35/10C04B35/14C04B35/26C04B35/48
CPCC04B35/66C04B35/14C04B35/10C04B35/48C04B35/26C04B2235/77C04B2235/5454C04B2235/5436C04B2235/3826C04B2235/5228C04B2235/5224
Inventor 张凡安煊熜李文静杨洁颖张恩爽张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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