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Sandwich cured carbon felt

A sandwich and carbon felt technology, applied in the direction of layered products, etc., can solve the problems of affecting the flow resistance and heat insulation performance and service life, the carbon felt or graphite paper is easy to damage and fall off, and the bonding strength between the surface layer and the paper core layer is low, etc., to achieve Not easy to drop slag or blocks, low cost, good interlayer bonding strength

Inactive Publication Date: 2015-02-11
GANSU HAOSHI CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual production and application process, this kind of sandwich-cured carbon felt has high requirements for the high-temperature adhesive required for production, mainly because the added graphite paper itself is very inert, and it is difficult to form an effective bond with the carbon felt. In addition, even if the bonding between carbon felt and graphite paper is good, since graphite paper itself is a kind of flexible graphite, the bonding strength between the surface layer and the paper core layer is very low, and it is easy to peel off
Therefore, this sandwich structure solidified carbon felt is easy to damage and fall off during use, which seriously affects its flow resistance and heat insulation performance and service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composite adhesive is composed of 100 parts of diluent, 90-160 parts of inorganic filler, 2-15 parts of curing agent and 80-120 parts of resin.

[0025] ⅰ A type A sandwich solidified carbon felt:

[0026] a. First dilute petroleum sulfonic acid with industrial ethanol, wherein the weight ratio of industrial ethanol and petroleum sulfonic acid is 100 parts: 2 parts, then stir for 20 minutes, then gradually add 80 parts of phenolic resin under stirring, and finally silicon carbide 90 parts Parts were added into the solution and the stirring was continued for 30 minutes to obtain a composite binder.

[0027] b. Brush evenly on the bonding surface of the matrix carbon felt in step a. to prepare a composite adhesive with a layer thickness of 0.7mm. Paste the matrix carbon felt on the composite adhesive, and then stack and compact it layer by layer with a pressure of 35MPa;

[0028] c. Take the sample pressurized in step b together with the mold or pressurization eq...

Embodiment 2

[0048] Preparation of ultra-large (diameter greater than 1.2m) ultra-thin (thickness less than 0.04m) tubular sandwich-cured carbon felt thermal field preparation:

[0049] a. Cut the number of carbon felts needed to prepare the cylindrical heat flow resistance field;

[0050] b. Preparation of composite adhesive: Dilute 12 parts of p-toluenesulfonic acid with 100 parts of industrial ethanol first, then stir for 20 minutes, then gradually add 90 parts of phenolic resin under stirring, and finally add 60 parts of graphite and 30 parts of white carbon black, 20 parts of silicon carbide, and continue to stir for 30 minutes to obtain a composite binder;

[0051] c. Take a piece of carbon felt that has been cut, and paint the prepared composite adhesive on the surface of the carbon felt, only one side is painted, and the thickness is about 1.2mm;

[0052] d. Wrap the carbon felt in step c around the mold, stick the side coated with the adhesive close to the surface of the mold, and ...

Embodiment 3

[0059] Preparation of sandwich-cured carbon felt sheets:

[0060] a. Cut the number of carbon felts needed to prepare the cylindrical heat flow resistance field;

[0061] b. Preparation of composite adhesive: first dilute 12 parts of boric acid and 15 parts of T31 with 100 parts of industrial ethanol, then stir for 20 minutes, then gradually add 90 parts of epoxy resin under stirring, and finally add 90 parts of carbon black, 20 parts of Part of white carbon black, after continuing to stir for 30 minutes, a composite binder was obtained;

[0062] c. Take a piece of carbon felt that has been cut, and paint the prepared composite adhesive on the surface of the carbon felt, and paint on both sides, with a thickness of about 1mm;

[0063] d. Stack the carbon felt layer by layer in step c, press and shape;

[0064] e. The sample finalized in step d, together with the mold, is raised from room temperature to 120°C in an atmospheric environment, and after 2 hours of heat preservati...

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Abstract

The invention provides a sandwich cured carbon felt obtained by cross-bonding a layer of substrate carbon felt, a layer of a composite bonding agent, and another layer of substrate carbon felt. The composite bonding agent is a precursor. Through curing, carbonizing and high-temperature purification, a layer of compact heat-flow-resistant layer is obtained. Also, the heat-flow-resistant layer plays a role of bonding the substrate carbon felts on both sides into a whole. With the interaction of the substrate carbon felts and the composite bonding agent, a composite bonding strength is much higher than the peel strength of the carbon felt, such that the bonding strength of the heat-flow-resistant layer and the carbon felts is ensured, and a unified whole which is hard to separate or peel is formed. Also, the hardness and strength of the heat-flow-resistant layer is much better than those of traditional graphite paper. The sandwich cured carbon felt obtained with the preparation method has the capacity of blocking and resisting heat flows, and has supporting performance and overall strength better than those of traditional sandwich cured carbon felts and conventional cured carbon felts.

Description

technical field [0001] The invention belongs to a heat-insulating and heat-preserving solidified carbon felt used in a high-temperature furnace. Background technique [0002] At present, compared with graphitized soft felt, solidified carbon felt has many advantages such as low volatility, low operation damage, good support performance, and convenient installation and replacement. It has been widely used in vacuum high-temperature furnaces or inert atmosphere high-temperature furnaces, such as vacuum high-pressure gas quenching Furnace, vacuum sintering furnace, pressurized vacuum sintering furnace, monocrystalline silicon furnace, polycrystalline silicon furnace, silicon carbide recrystallization furnace, etc. However, in actual production, especially in the furnace body with more high-temperature heat flow, the heat flow becomes the main way of heat loss, and a large amount of heat is transferred from the high-temperature area to the low-temperature area (furnace wall) wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/02B32B7/12
CPCB32B7/12B32B9/007
Inventor 柴昌盛杨子元
Owner GANSU HAOSHI CARBON FIBER
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