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Preparation method of rigid short carbon fiber preform

A technology of chopped carbon fiber and preform, which is applied in the field of preparation of rigid chopped carbon fiber preform, can solve the problems of performance anisotropy, easy layering of materials, time-consuming process, etc., achieves good heat insulation, overcomes easy separation layer effect

Inactive Publication Date: 2017-06-13
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a rigid chopped carbon fiber preform, so as to overcome the defects of easy layering of materials, anisotropy of properties, and time-consuming process in the preparation process of chopped carbon fiber preform in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a rigid chopped carbon fiber preform, comprising the following steps:

[0019] (1) Disperse the chopped carbon fiber powder into an aqueous solution with a dispersant content of 0.5wt% to make a slurry, wherein the dispersant is polyacrylic acid, the length of the chopped carbon fiber is 100 μm, and the chopped carbon fiber accounts for the total of the chopped carbon fiber and water. 40wt% of mass;

[0020] (2) Add 5wt% (based on the mass of the chopped carbon fiber powder used, the mass of the phenolic resin is 5wt% of the mass of the chopped carbon fiber powder) thermoplastic phenolic resin powder (particle size 80 mesh) to the obtained step (1) in slurry;

[0021] (3) Add 1wt% agarose powder (based on the quality of chopped carbon fiber powder used, the mass of agarose is 1wt% of the mass of chopped carbon fiber powder) to the slurry obtained in step (2);

[0022] (4) Put the slurry obtained in step (3) into a ball mill and mix evenly;

[0...

Embodiment 2

[0028] A method for preparing a rigid chopped carbon fiber preform, comprising the following steps:

[0029] (1) Disperse the chopped carbon fiber powder into an aqueous solution with a dispersant content of 0.5wt% to make a slurry, wherein the dispersant is ammonium polyacrylate, the length of the chopped carbon fiber is 500 μm, and the chopped carbon fiber accounts for the chopped carbon fiber and water 50wt% of the total mass;

[0030] (2) Add 5wt% (based on the mass of the chopped carbon fiber powder used, the mass of the phenolic resin is 5wt% of the mass of the chopped carbon fiber powder) thermoplastic phenolic resin powder (particle size: 100 mesh) to the result of step (1) in slurry;

[0031] (3) Add 5wt% gelatin powder (based on the quality of chopped carbon fiber powder used, the quality of gelatin powder is 5wt% of the mass of chopped carbon fiber powder) to the slurry obtained in step (2);

[0032] (4) Put the slurry obtained in step (3) into a ball mill and mix...

Embodiment 3

[0041] A method for preparing a rigid chopped carbon fiber preform, comprising the following steps:

[0042] (1) Disperse the chopped carbon fiber powder into an aqueous solution with a dispersant content of 1.0wt% to make a slurry, wherein the dispersant is polyacrylamide, the length of the chopped carbon fiber is 1mm, and the chopped carbon fiber accounts for the chopped carbon fiber and water. 60wt% of the total mass;

[0043] (2) Add 10wt% (based on the mass of the chopped carbon fiber powder used, the mass of the phenolic resin is 10wt% of the mass of the chopped carbon fiber powder) thermoplastic phenolic resin powder (300 mesh) to the slurry obtained in step (1) , mixed to obtain a slurry;

[0044](3) Add 7.5wt% pectin powder (based on the quality of chopped carbon fiber powder used, the quality of pectin powder is 7.5wt% of the mass of chopped carbon fiber powder) to the slurry obtained in step (2);

[0045] (4) Put the slurry obtained in step (3) into a ball mill an...

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Abstract

The invention discloses a preparation method of a rigid short carbon fiber preform. The preparation method comprises the following steps of: adding short carbon fibers, thermoplastic phenolic resin powder, a polysaccharide polymer and a dispersant into water, and uniformly grinding the mixture to prepare slurry; heating the obtained slurry to 40-80 DEG C, and stirring the mixture to form a sol; pouring the sol into a mold, after the sol is gelated, drying the gel at a normal pressure at 100-120 DEG C for 60-120 minutes, and then naturally cooling the gel to room temperature to obtain a short carbon fiber preform blank; and performing high-temperature carbonizing treatment on the short carbon fiber preform blank to prepare the rigid short carbon fiber preform. By taking the polysaccharide polymer as an adhesive of the short carbon fibers, the rigid short carbon fiber preform is prepared by virtue of a method of sol-gel, constant pressure drying and high-temperature carbonization, and the defect that a material is easy to layer, the performance anisotropy is obvious and the process is time-consuming when a carbon fiber preform is prepared in the prior art is overcome.

Description

technical field [0001] The invention belongs to the field of ablation body materials, and in particular relates to a method for preparing a rigid chopped carbon fiber prefabricated body. Background technique [0002] Thermal protection system (Thermal protection system, TPS) is an aircraft subsystem that protects the aircraft from the harsh aerodynamic heating environment when it passes through the planet's atmosphere at hypersonic speed, and enters the planet safely. Generally, thermal protection materials can be divided into two categories: reusable thermal protection materials and ablative thermal protection materials. Phenolic impregnated carbon ablator (PICA) is one of many ablative thermal protection materials. Public information shows that PICA is a fiber-reinforced phenolic airgel structural material prepared by impregnating a chopped carbon fiber preform with a phenolic resin solution. According to the preparation process of PICA, it can be divided into the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/624C04B35/636
CPCC04B35/83C04B35/624C04B35/636C04B2235/6022C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B2235/9607
Inventor 张东生姚栋嘉吴恒刘喜宗牛利伟
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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