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High-temperature-resistant nano thermal insulation material and preparation method thereof

A nano-insulation material and high-temperature-resistant technology, which is used in manufacturing tools, ceramic molding machines, etc., can solve the problems of insufficient temperature resistance of nano-insulation materials, and achieve improved high-temperature structural stability, temperature-resistant performance improvement, and improved stability. sexual effect

Active Publication Date: 2019-11-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of insufficient temperature resistance of nano-insulation materials in the prior art, the present invention provides a high-temperature-resistant nano-insulation material and its preparation method

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0027] In a first aspect, the present invention provides a method for preparing a high-temperature-resistant nano-insulation material, the method comprising the following steps:

[0028] (1) Mixing the nanopowder and the powder surface modifier evenly, so that the powder surface modifier is uniformly coated on the surface of the nanopowder to obtain an in-situ modified powder; the powder surface modification The agent is selected from one or more of silica sol, aluminum sol, silica-alumina sol, zirconium sol, and silica-zirconium sol; in the present invention, the nanopowder is also recorded as nanoparticles or nanopowder particles; The invention has no special requirements for silica sol, aluminum sol, silica-alumina sol, zirconium sol, and silica-zirconium sol, and the existing silica sol, alumina sol, silica-alumina sol, zirconium sol, and silica-zirconium sol can be used; in the present invention , the particle size of the powder surface modifier can be, for example, 0.5-1...

Embodiment 1

[0055] Example 1: Preparation of nano-silica powder / aluminum sol surface modifier / sucrose modification / mullite fiber high temperature resistant nano-insulation material

[0056] S1. According to the ratio of nano silica powder: aluminum sol surface modifier: sucrose solution: mullite fiber: silicon carbide = 500: 10: 10: 100: 50 (mass ratio), the materials were weighed respectively and set aside; The nano-silica powder used is a powder with a particle size between 1 and 50nm, and the aluminum sol surface modifier uses an aluminum sol with a colloidal particle size between 0.5 and 10nm, and the concentration of the aluminum sol is 2.5 wt%, the mullite fiber used is a mullite fiber with a diameter between 1 and 10um; the concentration of the sucrose solution is 5wt%;

[0057] S2. The aluminum sol surface modifier is gradually added to the container containing nano-silica powder under the action of mechanical fusion equipment, and mixed well, so that the aluminum sol surface modi...

Embodiment 2

[0065] Example 2: Preparation of nano-alumina powder / zirconium sol surface modifier / sucrose modification / mullite fiber high temperature resistant nano-insulation material

[0066] S1. According to the ratio of nano-alumina powder: zirconium sol surface modifier: sucrose solution: mullite fiber: silicon carbide = 500:30:15:80:60 (mass ratio), weigh the materials respectively and set aside; The nano-alumina powder is a powder with a particle size between 1 and 50nm, and the zirconium sol surface modifier is a zirconium sol with a colloidal particle size between 0.5 and 10nm, and the concentration of the zirconium sol is 2.5wt% , the mullite fiber used is a mullite fiber with a diameter between 1 and 10um; the concentration of the sucrose solution is 5wt%;

[0067] S2. The zirconium sol surface modifier is gradually added to the container containing the nano-alumina powder under the action of the mechanical fusion equipment, and fully mixed evenly, so that the zirconium sol surfa...

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Abstract

The invention relates to a high-temperature-resistant nano thermal insulation material and a preparation method thereof. The method comprises the following steps: uniformly mixing nano-powder and a powder surface modifier to coat the surface of the nano-powder with the powder surface modifier to obtain in-situ modified powder, with the powder surface modifier being selected from one or more of silica sol, alumina sol, silica-alumina sol, zirconium sol and silica-zirconium sol; compounding the in-situ modified powder with an organic polymer, and carrying out vacuum cracking to obtain carbon layer modified powder, with the organic polymer being a sucrose solution and / or a polymethacrylamide solution; uniformly mixing the carbon layer modified powder, inorganic fibers and additives to obtaina mixture; and subjecting the mixture to spreading and mold pressing to obtain the high-temperature-resistant nano thermal insulation material. According to the method, the surfaces of the nanoparticles are coated through in-situ modification, barriers are formed among the nanoparticles, and the surfaces are separated by the inert carbon layer, so that the difficulty of sintering growth of a skeleton structure at high temperature is increased, and the temperature resistance of the nano thermal insulation material is improved.

Description

technical field [0001] The invention relates to the technical field of functional composite materials, in particular to a high-temperature-resistant nano-heat insulation material and a preparation method thereof. Background technique [0002] At present, nano-insulation materials are mainly composed of additives such as nanoparticles, inorganic fibers, and opacifying agents. There are steps such as mixing of fiber / nano powder particles, molding of the mixture, and the like. Although there are fewer active sites on the surface of the nanoparticles that make up the skeleton of the thermal insulation material, nanoparticles with smaller particle sizes (nanoparticles with a primary particle size of several nanometers to tens of nanometers) are prone to sintering and growth at high temperatures, resulting in a three-dimensional structure. The network skeleton collapses and destroys, the material performance drops significantly, and the thermal insulation performance will also dr...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/14C04B35/10B28B3/02B28B1/52B28B1/54
CPCC04B35/66C04B35/14C04B35/10B28B3/02B28B1/52B28B1/54C04B2235/422C04B2235/5228C04B2235/5436
Inventor 张凡安煊熜李文静杨洁颖张恩爽张昊赵英民孔德隆高宇智
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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