High-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material and preparation method thereof

A thermal insulation material, aerogel technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of loose structure, high thermal conductivity and poor compactness of SiC coating materials, achieve ultra-low overall density, and improve mechanical properties. performance, the effect of reducing the pore size of the foam

Active Publication Date: 2017-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SiC coating material obtained by this preparation method has a loose structure, poor compactness, high thermal conductivity, and high density.

Method used

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  • High-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Immerse the flexible carbon foam obtained by pyrolysis of melamine foam in absolute ethanol, clean it with ultrasonic vibration for 30 minutes, take it out and dry it in an oven at 100°C for later use;

[0022] (2) Nickel nitrate hexahydrate, dehydrated alcohol are prepared nickel nitrate solution according to the mol ratio of 1: 20;

[0023] (4) The carbon foam is immersed in the nickel nitrate solution for 10 hours;

[0024] (5) Dry after impregnation, put it into a vapor deposition furnace, and chemical vapor deposit silicon carbide nanowires, using trichloromethylsilane as the silicon carbide gas source, hydrogen as the carrier gas, and argon as the dilution gas, and the deposition temperature is 1100 ℃, the deposition time is 2h, and the silicon carbide-carbon composite foam material is formed;

[0025] (6) The silica sol with a silicon oxide mass fraction content of 15% is SiO 2 Airgel silicon source, mix and stir deionized water: absolute ethanol: silica so...

Embodiment 2

[0030] (1) Immerse the flexible carbon foam obtained by pyrolysis of melamine foam in absolute ethanol, clean it with ultrasonic vibration for 30 minutes, take it out and dry it in an oven at 100°C for later use;

[0031] (2) Nickel nitrate hexahydrate, dehydrated alcohol are prepared nickel nitrate solution according to the mol ratio of 1: 10;

[0032] (4) The carbon foam is immersed in the nickel nitrate solution for 10 hours;

[0033] (5) Dry after impregnation, put it into a vapor deposition furnace, and chemical vapor deposit silicon carbide nanowires, using trichloromethylsilane as the silicon carbide gas source, hydrogen as the carrier gas, and argon as the dilution gas, and the deposition temperature is 1100 ℃, the deposition time is 2h, and the silicon carbide-carbon composite foam material is formed;

[0034] (6) The silica sol with a silicon oxide mass fraction content of 15% is SiO 2 Airgel silicon source, mix and stir deionized water: absolute ethanol: silica so...

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Abstract

The invention discloses a high-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material and a preparation method thereof. The high-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material is characterized by being prepared from a carbon foam enhanced body, grid-shaped silicon carbide nanowires and SiO2 aerogel, wherein the grid-shaped silicon carbide nanowires are used for filling and partitioning internal pore spaces of carbon foam, the SiO2 aerogel is used for evenly filling the carbon foam enhanced body, density is 0.05 to 0.15g/cm<3>, porosity is larger than 90%, the foam enhanced body is flexible carbon foam and prepared from tripolycyanamide foam which is pyrolyzed in high temperature, and the diameters of the grid-shaped silicon carbide nanowires are 50 to 20nm. Silicon carbide-carbon compound foam is prepared through chemical vapor deposition, and a normal-pressure drying technology is utilized to prepare the SiO2 aerogel to further obtain the high-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material. The high-temperature-resistance foam enhanced SiO2 aerogel thermal insulation material disclosed by the invention has the following advantages: 1, grid-shaped SiC nanowires can support a carbon framework to improve mechanical property of the compound material; 2, the silicon carbide nanowires reduce foam porosity and reduce thermal conductivity of the material; 3, the compound material has ultralow overall density.

Description

technical field [0001] The invention relates to a heat insulating material and a preparation method thereof, in particular to a high temperature resistant foam reinforced SiO 2 Airgel thermal insulation material and preparation method thereof. Background technique [0002] Aerogels are a class of porous thermal insulation materials that have received extensive attention in recent years. The solid-phase skeleton of the airgel is cross-linked by nanoparticles, the pore size is between a few nanometers and tens of nanometers, and it has a high specific surface area. The most common airgel is SiO 2 、Al 2 o 3 and carbon aerogels. Due to the unique nanostructure of airgel, its thermal conduction path is obviously suppressed, and it has extremely low thermal conductivity. At present, SiO 2 Airgel is the airgel material with the lowest thermal conductivity, therefore, SiO 2 The room temperature thermal conductivity of airgel can be as low as 0.012-0.020W / m·K, which is superior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/52C04B35/565C04B35/622
CPCC04B35/521C04B35/565C04B35/622C04B38/08C04B2235/3418C04B2235/77C04B38/0074
Inventor 陈照峰余盛杰汪洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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