Pressure difference-based method and device for improving properties of carbon paper of quick CVI coating

A differential pressure method, carbon paper technology, applied in papermaking, textiles and papermaking, synthetic cellulose/non-cellulose material pulp/paper, etc. problems such as durability problems, to achieve the effect of improving mechanical and electrical properties, uniform pore distribution, and low resistivity

Inactive Publication Date: 2010-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of carbonization and graphitization, the resin will gradually shrink in volume with the gradual increase of temperature, the density will decrease, cracks may occur between the fiber and the matrix carbon, and cracks may also occur inside the matrix carbon.
The direct consequence of these problems is that the overall electrical conductivity and mechanical properties of carbon paper will be seriously reduced, and durability will also be problematic.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Example 1: green body - hot pressing with resin - deposition - carbon paper

[0035] Use polyacrylonitrile-based carbon fiber as a reinforcing material, use phenolic or epoxy resin as an adhesive, and use dry-laid papermaking to shape carbon fiber to prepare a carbon fiber green body. The thickness of the green body is 100 to 800 microns, and the area density is 20. up to 70g / cm 3 , 1 meter wide and 100 meters long.

[0036] Cut the carbon paper body into corresponding size, use phenolic resin as adhesive, then dry, carbonize, graphitize, and prepare carbon fiber paper by traditional hot pressing method.

[0037] Finally, stack the carbon paper into stacks and place them in a box-type differential pressure deposition furnace for deposition for 10-100 minutes at a deposition temperature of 1050°C, using methane, propylene or liquefied petroleum gas as the carbon source, and nitrogen or argon as the dilution gas , The gas flow rate is generally adjusted according to the...

example 2

[0039] Example 2: green body - deposition - hot pressing with resin - carbon paper

[0040] Use polyacrylonitrile-based carbon fiber as a reinforcing material, use phenolic or epoxy resin as an adhesive, and use dry-laid papermaking to shape carbon fiber to prepare a carbon fiber green body. The thickness of the green body is 100 to 800 microns, and the area density is 20. up to 70g / cm 3 , 1 meter wide and 100 meters long.

[0041] Cut the carbon paper body into the corresponding size, stack the carbon paper into stacks, put them into a box-type differential pressure deposition furnace for deposition for 10-100 minutes, the deposition temperature is 1000°C, and use methane, propylene or petroleum liquefied gas as carbon Source, nitrogen or argon as the dilution gas, the gas flow rate is generally adjusted according to the size of the furnace cavity and the amount of material to be discharged.

[0042] Finally, phenolic resin was used as adhesive, the mass fraction of adhesiv...

example 3

[0044] Example 3: Green body - deposition - carbon paper

[0045] Use polyacrylonitrile-based carbon fiber as a reinforcing material, use phenolic or epoxy resin as an adhesive, and use dry-laid papermaking to shape carbon fiber to prepare a carbon fiber green body. The thickness of the green body is 100 to 800 microns, and the area density is 20. up to 70g / cm 3 , 1 meter wide and 100 meters long.

[0046] Finally, stack the carbon paper into stacks and place them in a box-type differential pressure deposition furnace for deposition for 1-5 hours at a deposition temperature of 950°C, using methane, propylene or petroleum liquefied gas as the carbon source, and nitrogen or argon as the dilution gas , The gas flow rate is generally adjusted according to the size of the furnace body and the amount of material to be discharged. The performance of the carbon paper material prepared by this example is as follows:

[0047] Thickness 300 microns, bulk density 0.56g / cm 3 , The resi...

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Abstract

The invention discloses a pressure difference-based method and a pressure difference-based device for improving properties of carbon paper of a quick CVI coating. The method comprises the following steps of: 1) preparation of a carbon fiber blank: using PAN-based carbon fiber serving as reinforcing materials and phenolic aldehyde or epoxy resin serving as a bonding agent to form the carbon fiber to prepare the carbon fiber blank by a the method papermaking method; and 2) deposition process: stacking the products, obtained by the step 1, placing the products in a reaction furnace for chemical vapor deposition. The device is a box-type reaction furnace in which two flat plate heating bodies are arranged, a deposition tank is placed between the two flat plate heating bodies which are parallel to each other, and the carbon paper or carbon paper blank is placed in the deposition tank; and one end and the other end of the reaction furnace are provided with an inlet and an outlet, which are used for flowing of the mixed gas of a carbon source and diluent gas, respectively. The method has the advantages that: the deposition is quick and the structure, density, porosity and the like are controllable; and the deposited carbon is evenly distributed on the surface of the carbon surface, and the prepared carbon paper material is low in resistivity, high in strength and good in isotropic degree.

Description

technical field [0001] The invention belongs to the field of carbon paper preparation, and relates to a method and a device for improving the performance of carbon paper based on a rapid CVI [chemical vapor infiltration] coating of a pressure difference method. Background technique [0002] Carbon paper is a kind of conductive functional paper, which can be widely used in anti-static packaging, electromagnetic shielding, surface heating, heat resistance and flame retardant, new energy, electrochemistry, biomedicine and other materials. Carbon paper is actually a special carbon / carbon composite material. It is of great significance to develop carbon paper materials with comprehensive properties such as good electrical conductivity, mechanical properties and pore structure, especially for the development of high-performance proton exchange membrane fuel cells. [0003] Carbon paper has a variety of unique and excellent properties: low density, high specific strength, high spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
CPCD21H13/50C04B35/83C04B2235/425C04B2235/48C04B2235/614C04B2235/616C04B2235/77
Inventor 谢志勇黄启忠苏哲安张明瑜陈建勋黄伯云
Owner CENT SOUTH UNIV
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