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Treatment method of carbon fiber ash for C/C (carbon/carbon) composite material

A technology of composite materials and processing methods, which is applied in the field of carbon fiber ash processing for C/C composite materials, can solve problems such as limiting the application of domestic carbon fibers, destroying the surface state, and affecting manufacturability, so as to eliminate adverse effects, improve adaptability, no effect on performance

Inactive Publication Date: 2012-07-04
XIAN AEROSPACE COMPOSITE MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct ash removal treatment of carbon fiber may damage its surface state, thereby affecting its subsequent use of manufacturability, and may cause significant changes in its performance, which greatly limits the application of domestic carbon fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1, using the traditional multi-directional weaving method to make the continuous carbon fiber into a carbon fiber prefabricated body; the mass content of ash in the continuous carbon fiber is 0.1%;

[0018] Step 2, placing the carbon fiber preform described in step 1 in a graphitization furnace, heat-treating it for 5 hours at a temperature of 2450° C. under vacuum conditions, and then cooling with the furnace to obtain a carbon fiber preform with an ash content of 0.05% by mass;

[0019] Step 3: Prepare the carbon fiber prefabricated body cooled in step 2 into a C / C composite material by conventional gas-phase or liquid-phase composite densification method.

[0020] The mass content of ash in the carbon fiber preform treated by the method of this example is 0.05%, and the performance of the C / C composite material prepared by using the treated carbon fiber preform is excellent, and there is no difference in the performance of the C / C composite material prepared by i...

Embodiment 2

[0022] Step 1. Making the continuous carbon fiber into a carbon fiber prefabricated body by traditional acupuncture method; the mass content of ash in the continuous carbon fiber is 0.5%;

[0023] Step 2. Place the carbon fiber prefabricated body described in step 1 in a graphitization furnace, heat-treat for 2 hours under the protection of inert gas argon at a temperature of 2550° C., and then cool with the furnace;

[0024] Step 3: repeat step 2 twice to obtain a carbon fiber preform with a mass content of 0.007% ash, and then prepare the carbon fiber preform into a C / C composite material by conventional gas phase or liquid phase composite densification method.

[0025] The mass content of ash in the carbon fiber preform treated by the method of this example is 0.007%, and the performance of the C / C composite material prepared by using the treated carbon fiber preform is excellent, and there is no difference in the performance of the C / C composite material prepared by importe...

Embodiment 3

[0027] Step 1, using the traditional multi-directional weaving method to make the continuous carbon fiber into a carbon fiber prefabricated body; the mass content of ash in the continuous carbon fiber is 0.8%;

[0028] Step 2. Place the carbon fiber prefabricated body described in step 1 in a graphitization furnace, heat-treat for 3 hours under vacuum conditions at a temperature of 2550° C., and then cool with the furnace;

[0029] Step 3: repeat step 2 3 times to obtain a carbon fiber preform with a mass content of 0.01% ash, and then prepare the carbon fiber preform into a C / C composite material by conventional gas phase or liquid phase composite densification method.

[0030] The mass content of ash in the carbon fiber preform treated by the method of this example is 0.01%, and the performance of the C / C composite material prepared by using the treated carbon fiber preform is excellent, and there is no difference in the performance of the C / C composite material prepared by i...

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Abstract

The invention discloses a treatment method of carbon fiber ash for a C / C (carbon / carbon) composite material. The method comprises the following steps of: 1, preparing a carbon fiber prefabricate from continuous carbon fiber by adopting a traditional prefabricate forming method; 2, placing the carbon fiber prefabricate in a graphitizing furnace and carrying out thermal treatment for 2 hours-5 hours at the temperature of 2450 DEG C-2550 DEG C under the protection of vacuum or inert gas, and then cooling along with the furnace; and 3, preparing the cooled carbon fiber prefabricate into the C / C composite material by adopting a conventional method, or repeating the step 2 1-3 times, and then preparing the carbon fiber prefabricate into the C / C composite material by adopting a conventional method. By using the treatment method, application of high-ash carbon fiber is realized, and adaptability of a raw material is improved; and the mass content of the ash in the carbon fiber prefabricate treated by using the method is not more than 0.05%, and the property of the C / C composite material prepared from the treated carbon fiber prefabricate is excellent and identical to that of the C / C composite material prepared from imported carbon fiber.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a processing method for carbon fiber ash used in C / C composite materials. Background technique [0002] C / C composites are a general type of synthetic pure carbon material consisting of a carbon matrix reinforced by carbon fibers. It has a series of outstanding features such as light weight, good thermal shock resistance, low thermal expansion coefficient, high high temperature strength retention, high impact resistance and high rigidity, and is especially suitable for materials that require high It is used in an environment with excellent physical and chemical stability, and has been successfully used in important fields such as spacecraft nose cones, wing leading edges, solid engine throat linings, expansion sections, and aircraft brake discs. As a reinforcing material of carbon fiber, its performance, distribution, state, etc. are very important to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83
Inventor 李瑞珍崔红冯阳阳程文孙建涛王翔李晋
Owner XIAN AEROSPACE COMPOSITE MATERIALS INST
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