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A kind of preparation method of carbon fiber hard felt with density gradient

A density gradient, carbon fiber technology, used in chemical instruments and methods, lamination auxiliary operations, coatings, etc., can solve the problem of weak adhesion of silicon carbide coating, failure to reach carbon fiber hard felt aging, and easy shedding of silicon carbide coating. and other problems, to achieve the effect of improving antioxidant capacity, low cost, and improving overall performance

Active Publication Date: 2022-03-11
山东众途复合材料有限公司
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Problems solved by technology

[0005] However, due to the weak adhesion of the silicon carbide coating on the surface of the carbon fiber hard felt, and the high temperature and corrosive environment in the furnace, the silicon carbide coating is easy to fall off; at the same time, in the actual production process, the carbon fiber hard felt needs to be often loaded into the In the high temperature furnace or taken out of the high temperature furnace, this also causes the silicon carbide coating to fall off easily
Therefore, in the prior art, the purpose of delaying the aging of carbon fiber hard felt cannot be achieved by coating silicon carbide coatings.

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  • A kind of preparation method of carbon fiber hard felt with density gradient

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preparation example Construction

[0038] The application provides a method for preparing a carbon fiber hard felt with a density gradient, comprising the following steps in sequence:

[0039] 1) According to the temperature gradient of the thermal field in the furnace, the density of each layer in the thickness direction of the carbon fiber hard felt of the target finished product is formulated;

[0040] Controlled in the region where the thermal field temperature T1 is 1600°C3 ≤ρ1≤0.3kg / m 3 ;

[0041] Controlled in the region where the thermal field temperature T2 is 1200°C3 ≤ρ2≤0.2kg / m 3 ;

[0042] Controlled in the region where the thermal field temperature T3 is 600°C3 ≤ρ3≤0.15kg / m 3 ;

[0043] 2) According to the density ρ1 of the carbon fiber hard felt layer 1, determine the raw silk type and gram weight of the carbon fiber soft felt 1: the gram weight is 1200g / m 2 ~1500g / m 2 Pitch-based carbon fiber soft felt with a grammage of 1200g / m 2 ~1500g / m 2 Polyacrylonitrile-based carbon fiber soft felt ...

Embodiment 1

[0063] A preparation method of a carbon fiber hard felt with a density gradient, comprising the following steps in sequence:

[0064] 1) According to the temperature gradient of the thermal field in the furnace, the density of each layer in the thickness direction of the carbon fiber hard felt of the target finished product is formulated;

[0065] Controlled in the region where the thermal field temperature T1 is 1600°C3 ≤ρ1≤0.28kg / m 3 ;

[0066] Controlled in the region where the thermal field temperature T2 is 1200°C3 ≤ρ2≤0.18kg / m 3 ;

[0067] Controlled in the region where the thermal field temperature T3 is 600°C3 ≤ρ3≤0.15kg / m 3 ;

[0068] 2) According to the density ρ1 of the carbon fiber hard felt layer 1, determine the raw silk type and gram weight of the carbon fiber soft felt 1: the gram weight is 1400g / m 2Pitch-based carbon fiber soft felt with a grammage of 1300g / m 2 Polyacrylonitrile-based carbon fiber soft felt or a grammage of 1350g / m 2 Viscose-based carbo...

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Abstract

This application provides a preparation method of carbon fiber hard felt with a density gradient. According to the different density requirements of each layer in the carbon fiber hard felt, the material and grammage of the carbon fiber soft felt are selected, and then the soft felt is impregnated with resin in turn. , drying, each layer is sprayed with a special binder, hot-pressed and solidified, coated with a special surface treatment agent, and vacuum-high-temperature sintered, and finally can be made into multi-layers with different densities in the thickness direction, and the density is from 0.12g / cm 3 -0.3g / cm 3 Density gradient, graphitized carbon fiber hard felt; this application has improved the structure of carbon fiber hard felt, and the carbon fiber hard felt layers of different densities are compatible with the temperature gradient of the thermal field in the furnace. Both regions and low-temperature regions have good thermal insulation properties, and the surface treatment agent on the outer surface of the carbon fiber hard felt can effectively improve the oxidation resistance and overcome the defects of the existing silicon carbide coating.

Description

technical field [0001] The invention relates to the technical field of carbon fiber thermal insulation materials, in particular to a preparation method of a carbon fiber hard felt with a density gradient. Background technique [0002] With the development of photovoltaic and solar energy industries, the demand for heat insulation materials is also increasing. Due to its low operating temperature (<1800°C), traditional heat insulation materials are highly polluting, and it is difficult to make a thin heat insulation layer, occupying the space in the furnace body, thus wasting the space in the high temperature furnace. The new carbon fiber insulation material has become a high-temperature furnace due to its excellent properties such as small thermal conductivity, low heat capacity, low density, small linear expansion coefficient, high temperature resistance, strong thermal shock resistance, strong chemical corrosion resistance, high purity and no pollution. The most import...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B9/00B32B7/12B32B33/00B32B37/12B32B37/10B32B37/06B32B38/16B32B38/08B32B7/022
CPCB32B9/047B32B5/02B32B5/26B32B7/12B32B33/00B32B37/12B32B37/10B32B37/06B32B38/164B32B38/08B32B7/02B32B2262/106B32B2250/03B32B2250/20B32B2038/166B32B2255/02B32B2255/26B32B2307/50B32B2307/546B32B2307/304B32B2307/72
Inventor 刘鹏武徐滨王泽王杰
Owner 山东众途复合材料有限公司