Fiber-enhanced integrated material with high-temperature resistance property and high emissivity and preparation method thereof

A high-emissivity, fiber-reinforced technology, which is applied in the field of fiber-reinforced high-temperature-resistant and high-emissivity integrated materials and their preparation, can solve the problems of insufficient thermal insulation and mechanical properties, achieve excellent thermal protection effect, improve antioxidant performance, The effect of high temperature resistance

Inactive Publication Date: 2018-07-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the anti-heat insulation materials that are mainly researched at home and abroad generally have problems such as high temperature resistance above 1000 °C, insufficient heat insulation and mechanical pr

Method used

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  • Fiber-enhanced integrated material with high-temperature resistance property and high emissivity and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] (1) Carbon fiber reinforced C-SiO 2 The preparation of aerogel: The carbon fiber felt is placed under a flat weight and pressed for 24 hours to obtain a flat pressed carbon fiber felt. After mixing catechol, formaldehyde, and ethanol at a molar ratio of 1:2:15, stir uniformly at 25°C for 10 minutes to obtain catechol-formaldehyde (CF) sol; then add a certain amount of 3 -Aminopropyltriethoxysilane (APTES) and place it at 25℃ and stir evenly. The molar ratio of APTES to catechol is 1:1. After stirring for 10 minutes, the mixed sol is injected into the flat pressure treatment In the carbon fiber felt, keep the liquid surface immersed in the surface of the carbon fiber felt. After sealing, place it in an oven at 50°C for 12 hours and wait for it to gel. Add ethanol for aging, continue to add ethanol in the 50°C oven for solvent replacement 5 times, once every 24h . The composite wet gel was subjected to carbon dioxide supercritical drying treatment, the temperature was con...

example 2

[0039] (1) Carbon fiber reinforced C-SiO 2 The preparation of aerogel: The carbon fiber felt is placed under a flat weight and pressed for 24 hours to obtain a flat pressed carbon fiber felt. After mixing catechol, formaldehyde, and ethanol at a molar ratio of 1:1:12, the catechol-formaldehyde (CF) sol is obtained after uniform stirring at a temperature of 25°C for 10 minutes; then a certain amount of 3 is added -Aminopropyltriethoxysilane (APTES) and stir uniformly at a temperature of 25°C. The molar ratio of APTES to catechol is 1.5:1. After stirring for 10 minutes, the mixed sol is injected into the flat pressure treatment In the carbon fiber felt, keep the liquid surface immersed in the surface of the carbon fiber felt, place it in an oven at 50°C for 12h after sealing, add ethanol for aging, continue to add ethanol in the oven at 50°C for solvent replacement 5 times, once every 24h. The composite wet gel was subjected to carbon dioxide supercritical drying treatment, the t...

example 3

[0044] (1) Carbon fiber reinforced C-SiO 2 The preparation of aerogel: The carbon fiber felt is placed under a flat weight and pressed for 24 hours to obtain a flat pressed carbon fiber felt. After mixing catechol, formaldehyde, and ethanol at a molar ratio of 1:3:16, the catechol-formaldehyde (CF) sol is obtained after uniform stirring at a temperature of 25°C for 10 minutes; then a certain amount of 3 is added -Aminopropyltriethoxysilane (APTES) and place it at 25℃ and stir uniformly. The molar ratio of APTES to catechol is 0.75:1. After stirring for 10 minutes, the mixed sol is injected into the flat pressure treatment In the carbon fiber felt, keep the liquid surface immersed in the surface of the carbon fiber felt, place it in an oven at 50°C for 12h after sealing, add ethanol for aging, continue to add ethanol in the oven at 50°C for solvent replacement 5 times, once every 24h. The composite wet gel was subjected to carbon dioxide supercritical drying treatment, the tempe...

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Abstract

The invention discloses a fiber-enhanced integrated material with high-temperature resistance property and high emissivity and a preparation method thereof. The preparation method comprises the following steps of using a carbon fiber felt as a framework support; filling the framework with a C-SiO2 (carbon-silicon dioxide) composite aerogel, so as to obtain the carbon fiber-enhanced C-SiO2 aerogel;coating a high-emissivity heat prevention coating layer to the surface of the carbon fiber-enhanced C-SiO2 aerogel; filling a C-SiO2 aerogel with high-temperature resistance property and low heat conductivity into the carbon fiber felt by a sol-gel method, a carbon dioxide super-critical drying technique and high-temperature heat treatment process, so as to form a heat isolation material with light weight, high-temperature resistance property and scouring resistance property; preparing a molybdenum disilicide-B2O3(boron oxide)-SiO2 glass coating layer at the surface of the heat isolation material by a slurry impregnating method and a quick heat treatment method, so as to form the fiber-enhanced integrated material with high-temperature resistance property and high emissivity. The fiber-enhanced integrated material has the advantages that the high temperature of 1500 DEG C can be resisted; the internal carbon fiber-enhanced C-SiO2 aerogel has lower heat conductivity of 0.035 to 0.045W.m<-1>.K<-1>; the emissivity of the surface heat protection coating layer at room temperature is greater than 0.85.

Description

Technical field [0001] The invention belongs to the field of preparation of anti-heat insulation materials, and specifically relates to a fiber-reinforced, high-temperature, high-emissivity integrated material and a preparation method thereof. Background technique [0002] Due to the high flight speed and long flight time of high Mach number aircraft, the serious aerodynamic heating problem generated on the surface of the aircraft puts higher requirements on the external insulation materials of the cabin and solid rocket motors. At present, the anti-insulation materials that are researched at home and abroad generally have problems such as high temperature resistance above 1000 ℃, insufficient thermal insulation and mechanical properties, etc., which are difficult to meet the surface impact and aerodynamic heating caused by the harsh external environment when flying in space or adjacent space. And thermal requirements. While carbon fiber reinforced C-SiO 2 Aerogel material overc...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B41/87
CPCC04B35/80C04B41/009C04B41/5071C04B41/87C04B2235/3418C04B2235/483C04B2235/5248C04B2235/9607C04B41/5022C04B41/0072
Inventor 陆宇操锁浩沈晓冬崔升徐良旭
Owner NANJING UNIV OF TECH
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