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Aerogel surface high-temperature-resistant composite coating and preparation method thereof

A composite coating and aerogel technology, used in coatings, glass manufacturing equipment, fire-resistant coatings, etc., can solve the problems of poor anti-oxidation and anti-scour performance, large differences in components, and powder falling off. Improve anti-oxidation performance and anti-scour performance, easy operation, and the effect of isolating the entry of oxygen

Active Publication Date: 2022-01-14
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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Problems solved by technology

[0003] Chinese patent CN111040547A discloses a thermal insulation airgel coating and its preparation method, the coating consists of SiO2 gas It is composed of thermal insulation coating of gel and reflective coating containing TiO2, which is suitable for industrial heat exchange field; however, the thermal insulation coating formed by airgel slurry is loose and porous, dense low, resulting in poor oxidation resistance and erosion resistance of the substrate. At the same time, there is a large difference in components between the thermal insulation coating containing SiO2 aerogel and the phenolic resin matrix. Under high temperature conditions, the coating is prone to problems such as cracking and powder falling off
[0004] Chinese patent CN109517520A discloses a method for preparing an airgel coating from an airgel coating. Similarly, a simple airgel coating has antioxidant properties and poor erosion resistance

Method used

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  • Aerogel surface high-temperature-resistant composite coating and preparation method thereof

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preparation example Construction

[0032] The invention provides a method for preparing a high temperature resistant composite coating on the surface of an airgel, the preparation method comprising the following steps:

[0033] (1) Airgel and inorganic oxide sol are mixed to obtain airgel coating;

[0034] (2) will B 2 o 3 Powder, Al 2 o 3 Powder and SiO 2 Powders are mixed and sintered, and then a solvent is added for ball milling to obtain a borosilicate glass coating;

[0035] (3) The airgel coating is applied to the substrate surface, and the airgel coating is obtained after drying;

[0036] (4) Applying the borosilicate glass coating to the surface of the airgel coating, and drying to obtain a high temperature resistant composite coating on the airgel surface comprising a borosilicate glass coating.

[0037] In the prior art, a single airgel coating is loose and porous, and oxygen can easily pass through the coating to react with the substrate, causing the substrate to oxidize under high temperature ...

Embodiment 1

[0063] (1) The dried phenolic aerogel is added to Al with a solid content of 20%. 2 o 3 Carry out ball milling and mixing 2h in the sol, obtain airgel coating; Wherein, the addition amount of phenolic airgel is Al 2 o 3 20% of the sol;

[0064] (2) In terms of parts by mass, 5 parts of B 2 o 3 powder, 40 parts of Al 2 o 3 powder and 55 parts of SiO 2 The powders (both particle sizes are 200 μm) were ball milled and mixed for 4 hours, then sintered in an air atmosphere furnace at 1350°C for 3 hours, cooled naturally to room temperature (25°C), and then added a solvent with a volume ratio of ethanol:ethylene glycol=2:1 Perform ball milling and mixing for 6 hours to obtain borosilicate glass coating;

[0065] (3) The obtained airgel paint is applied to the surface of the phenolic airgel substrate by spraying (the thickness of the coating is 1mm), and after drying at 100°C for 3h, the airgel coating (thickness is 1mm);

[0066] (4) Apply the obtained borosilicate glass co...

Embodiment 2

[0068] (1) The dried carbon fiber composite phenolic airgel (wherein, the mass fraction of carbon fiber is 70%, the mass fraction of phenolic airgel is 30%, and the parameters of the used carbon fiber are completely consistent with the carbon fiber in the matrix) is added up to 30% solids SiO 2 Carry out ball milling and mixing in the sol for 6h to obtain the airgel coating; wherein the addition amount of the carbon fiber composite phenolic airgel is SiO 2 30% of the sol;

[0069] (2) In terms of parts by mass, 10 parts of B 2 o 3 powder, 50 parts of Al 2 o 3 powder and 40 parts of SiO 2 Powder (all particle sizes are 100 μm) was ball milled and mixed for 4 hours, then sintered in an air atmosphere furnace at 1500°C for 4 hours, cooled naturally to room temperature (25°C), and then added with ethanol solvent for ball milling and mixed for 7 hours to obtain borosilicate glass coating;

[0070] (3) the obtained airgel coating is applied to the surface of the carbon fiber c...

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Abstract

The invention provides an aerogel surface high-temperature-resistant composite coating and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing aerogel and inorganic oxide sol to obtain an aerogel coating; (2) mixing and sintering B2O3 powder, Al2O3 powder and SiO2 powder, and then adding a solvent for ball milling and mixing to obtain a borosilicate glass coating; (3) coating the surface of a substrate with the aerogel coating, and drying to obtain an aerogel coating; and (4) coating the surface of the aerogel coating with the borosilicate glass coating, and drying to obtain the aerogel surface high-temperature-resistant composite coating containing the borosilicate glass coating. The high-temperature-resistant composite coating prepared by the method is not easy to fall off on the surface of a matrix, and has excellent oxidation resistance and scouring resistance.

Description

technical field [0001] The invention relates to the technical field of high-temperature-resistant coatings, in particular to a high-temperature-resistant composite coating on an airgel surface and a preparation method thereof. Background technique [0002] As a class of nanoporous materials, phenolic airgel and its fiber composites have the characteristics of low density, low thermal conductivity and high porosity, and are widely used in the fields of heat insulation materials and catalytic carriers; and they are prone to occur under high temperature conditions. Carbonization or even sublimation can take away a lot of heat from the surrounding environment, so it is also an excellent ablation material. However, phenolic airgel, like other airgel materials, is formed by the accumulation of a large number of nanoparticles, and the interaction force between nanoparticles is weak, which makes the nanopowder on the surface of the phenolic airgel material easy to fall off; at the s...

Claims

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Application Information

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IPC IPC(8): C08J9/36C09D1/00C09D7/65C09D7/61C03C12/00C03B19/10C08L61/06C08K7/06C08K7/10C08K7/14
CPCC08J9/365C09D1/00C09D5/18C09D7/65C09D7/61C09D7/70C03C12/00C03B19/1005C08J2361/06C08K7/06C08K7/10C08K7/14
Inventor 黄秀波张杨刘圆圆李文静孙同臣
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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