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Preparation method of carbon fiber hard felt with density gradient

A density gradient, carbon fiber technology, applied in chemical instruments and methods, lamination devices, lamination auxiliary operations, etc., can solve the problem that the silicon carbide coating is easy to fall off, cannot reach the aging of carbon fiber hard felt, and the adhesion of silicon carbide coating. Weak and other problems, to achieve the effect of improving antioxidant capacity, reducing cracking, and reducing high-temperature oxidation shedding

Active Publication Date: 2020-07-14
山东众途复合材料有限公司
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  • Abstract
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  • Application Information

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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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  • 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

The invention provides a preparation method of a carbon fiber hard felt with density gradient. The method comprises the steps of: according to the requirements of different densities of each layer inthe carbon fiber hard felt, selecting the material and gram weight of the carbon fiber soft felt; and then sequentially carrying out soft felt resin impregnation, drying, spraying of a special binderon each layer, hot-pressing curing, coating of a special surface treating agent and vacuum high-temperature sintering to finally prepare the graphitized carbon fiber hard felt which is divided into multiple layers with different densities in the thickness direction and has the density gradient of 0.12 g / cm <3>-0.3 g / cm <3>. According to the invention, the structure of the carbon fiber hard felt isimproved, the carbon fiber hard felt layers with different densities are matched with the temperature gradient of a thermal field in a furnace, the carbon fiber hard felt layers have the good heat preservation performance in a high-temperature area, a medium-temperature area and a low-temperature area in the thermal field, the surface treating agent on the outer surface of the carbon fiber hard felt can effectively improve the oxidation resistance, and the defects of an existing silicon carbide coating are overcome.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B9/00B32B7/12B32B33/00B32B37/12B32B37/10B32B37/06B32B38/16
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