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A controllable structure heat insulation material and its preparation method

A heat insulation material and structural fiber technology, applied in textiles and papermaking, fiber treatment, non-woven fabrics, etc., can solve the problems of uneven distribution of anti-radiation agents, complex dispersion system, poor stability of dispersion system, etc., to achieve high temperature Thermal insulation performance, good thermal insulation performance, and stable performance

Active Publication Date: 2022-05-03
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the anti-radiation scheme of the reinforcement fiber, since the anti-radiation agent is only concentrated on the surface of the fiber, there is a problem of uneven distribution of the anti-radiation agent.
Although the last type of scheme realizes the differential distribution of radiation-resistant structures in the heat transfer direction of the material through technological means for the first time on the basis of ensuring the overall material and air permeability, which significantly improves the heat insulation efficiency of the material, but this construction method needs to be in place. Dispersion of anti-radiation powder in sol, the dispersion system is complex, the more components there are, the worse the stability of the dispersion system, and the obtained structure is often a continuous density gradient structure, which is suitable for multivariate controllable component distribution and more precise controllable There are still some difficulties in the preparation of density gradient structures

Method used

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  • A controllable structure heat insulation material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The size is 500 mm× 500 mm×30 mm, and the density is 0.1 g / cm 3A piece of commercially available quartz fiber felt with a thermal conductivity of 0.12 W / (m•K) and a thermal conductivity of 0.24 W / (m•K) at 1000°C. To 600 mm×600 mm×50 mm tank (i.e., composite container) was added 37.5L of silicon carbide - tert-butanol dispersion with a solid content of 8%, the quartz felt was slowly placed into it until the dispersion was all sucked into the felt body, after 30min of rest, it was taken out and quickly frozen at 0 °C, a layer of about 15mm thick silicon carbide was formed inside the fiber felt, and then the fiber felt was placed in a tank of 600 mm × 600 mm ×50 mm, and the solid content was added to 4% The silicon carbide- tert-butanol dispersion liquid to the dispersion liquid to completely soak the remaining space of the felt, quickly frozen again at 0 °C, and then dried in vacuum to obtain radiation-resistant fiber felt, with a total weight gain of 60%, a thermal conducti...

Embodiment 2

[0029] The size is 500 mm× 500 mm×30 mm, and the density is 0.1 g / cm 3A piece of commercially available quartz fiber felt with a thermal conductivity of 0.12 W / (m•K) and a thermal conductivity of 0.24 W / (m•K) at 1000°C. To 600 mm×600 mm ×50 mm tank was added 25L silicon carbide - tert-butanol dispersion with a solid content of 6%, the quartz felt was slowly placed into it until the dispersion was all sucked into the felt body, after 30min of rest, it was taken out at 0 °C and quickly frozen, a layer of about 10mm thick silicon carbide was formed inside the fiber felt, and then 25L of silicon carbide-tert-butanol dispersion with a solid content of 2% was added to the tank with a solid content of 2% to the tank of 600 mm× × 600 mm. The uncombined side of the quartz felt is slowly placed into it until the dispersion is all sucked into the felt body, after 30min of rest, it is taken out again and quickly frozen at 0 ° C, and an anti-radiation layer of about 10 mm thick is formed at b...

Embodiment 3

[0031] The size is 500 mm× 500 mm×30 mm, and the density is 0.1 g / cm 3A piece of commercially available quartz fiber felt with a thermal conductivity of 0.12 W / (m•K) and a thermal conductivity of 0.24 W / (m•K) at 1000°C. Add 37.5L of silicon carbide-tert-butanol dispersion with a solid content of 5% to the tank of 600 mm × 600 mm ×50 mm, slowly put the quartz felt into it until the dispersion is all sucked into the felt body, take it out at 0 °C after 30 min of rest, quickly freeze it, form a layer of about 15 mm thick silicon carbide inside the fiber felt, and then place the fiber felt in a tank of 600 mm ×600 mm ×50 mm, and add a solid content of 3% Boron nitride - water dispersion liquid to dispersion liquid to completely soak the remaining space of the felt, again in -20 °C rapid freezing, and then dried in vacuum, to obtain radiation-resistant fiber felt, the total weight gain of 42%, 600 °C thermal conductivity of 0.057 W / (m • K), 1000 °C thermal conductivity of 0.1 W / (m...

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Abstract

The invention discloses a heat insulation material with a controllable structure and a preparation method thereof, belonging to the technical field of thermal protection. The anti-radiation preparation is prepared, the fiber prefabricated body is partially compounded, freeze-formed, compounded again, dried and airgel compounded to prepare Controllable structural insulation. The invention can realize the design and preparation of the optimal radiation-resistant structure, and the prepared controllable structure heat insulation material is an airgel composite material with a controllable density distribution anti-infrared radiation structure, which can realize double improvement of high-temperature heat insulation performance.

Description

Technical field [0001] The present invention relates to a controllable structure thermal insulation material and a preparation method thereof, belonging to the field of thermal protection technology. Background [0002] Nano thermal insulation materials represented by oxide aerogel materials such as silica and alumina have many advantages such as high temperature resistance, light weight, excellent thermal insulation performance and stable performance, and have been widely used in the fields of aviation, aerospace, deep space exploration and civil thermal insulation and insulation at home and abroad. The nanoskeleton and nanoporous structure of these materials can greatly inhibit solid phase heat conduction and convective heat conduction, so it has excellent thermal insulation effect. However, this type of material has good transmittance for infrared radiation in the high temperature zone, and the proportion of radiative heat transfer will increase rapidly with increasing temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/08D06M11/77D06M11/80D06M11/49D06M11/74
CPCD04H1/08D06M11/77D06M11/80D06M11/49D06M11/74
Inventor 黄红岩李文静张恩爽郭慧权成杨洁颖张凡赵英民裴雨辰张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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