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A kind of c/c composite material and preparation method thereof

A composite material and slurry technology, which is applied in the field of C/C composite materials and their preparation, can solve the problems of material strength and reliability need to be improved, and achieve the effects of shortening the preparation cycle, short preparation cycle and reducing cost.

Active Publication Date: 2021-06-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method makes the material have good sealing performance through fiber modification, but the strength and reliability of the material need to be improved

Method used

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  • A kind of c/c composite material and preparation method thereof
  • A kind of c/c composite material and preparation method thereof
  • A kind of c/c composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present invention provides a kind of preparation method of C / C composite material, and preparation technological process is as follows figure 1 shown, including the following steps:

[0054] (1) A 2.5D carbon fiber prefabricated body is prepared by needle punching, with a thickness of 100mm;

[0055] (2) Put the above-mentioned carbon fiber prefabricated body into a vacuum heating furnace for heat treatment, the heating temperature is 1000°C, the heating time is 1.5h, and the pressure is controlled within 300pa to obtain a degummed prefabricated body;

[0056] (3) Preparation of water-based graphite slurry: high-purity and high-graphitization flake graphite powder (800 mesh), sodium carboxymethyl cellulose (dispersant), epoxy resin aqueous solution, and deionized water are 15 according to the mass ratio: 2: 20: 63 configured as graphite water-based slurry, mechanically stirred for 30 minutes and then ball milled, the ball milling time was 2 hours, and the ball mill...

Embodiment 2

[0064] The invention provides a kind of preparation method of C / C composite material, comprises the following steps:

[0065] (1) 2.5D carbon fiber prefabricated body is used, with a thickness of 30mm;

[0066] (2) Put the above-mentioned carbon fiber prefabricated body into a vacuum heating furnace for slow heating heat treatment, the holding temperature is 1200°C, the holding time is 3h, and the pressure is controlled within 300pa to obtain a degummed carbon fiber prefabricated body;

[0067] (3) Preparation of water-based graphite slurry: high-purity and high-graphitization flake graphite powder (800 mesh), sodium carboxymethyl cellulose (dispersant), epoxy resin aqueous solution, and deionized water are 15 according to the mass ratio: 2: 10: 60 is configured as graphite water-based slurry, mechanically stirred for 30 minutes and then ball milled. The ball milling time is 2 hours, and the ball milling speed is 200r / min;

[0068](4) Slurry injection: Utilize the injection m...

Embodiment 3

[0075] The invention provides a kind of preparation method of C / C composite material, comprises the following steps:

[0076] (1) A 2.5D carbon fiber prefabricated body is prepared by acupuncture, with a thickness of 50mm;

[0077] (2) Put the above-mentioned carbon fiber prefabricated body into a vacuum heating furnace for heat treatment, the heating temperature is 1100° C., the heating time is 1 h, and the pressure is controlled within 300 Pa to obtain a degummed prefabricated body;

[0078] (3) Preparation of water-based graphite slurry: high-purity and high-graphitization flake graphite powder, sodium carboxymethylcellulose+polyethylene glycol (composite dispersant, mass ratio 3:1), polyacrylic resin emulsion, Ionized water is configured into graphite water-based slurry according to the mass ratio of 10:1:20:69. The graphite powder used is 500 mesh and 1000 mesh, and the mass ratio is 3:7. After mechanical stirring for 30 minutes, ball milling is carried out, and the ball ...

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Abstract

The invention discloses a C / C composite material and a preparation method thereof, which belong to the technical field of material preparation and are suitable for preparing friction and wear materials and sealing materials, comprising the following steps: 1) preparation of a preform; 2) degumming treatment; 3) water 4) Graphite slurry injection; 5) Graphite slurry refilling; 6) Preparation of green body; 7) Carbonization treatment; 8) Densification treatment: sequentially adopt chemical vapor infiltration process and high temperature hot pressing The process densifies the C / C porous prefabricated body to obtain a C / C composite material with excellent friction and wear properties. Introducing graphite powder, the C / C composite material prepared by the present invention can be applied to friction and wear materials such as large aircraft brakes, high-speed trains, automobiles, and large trucks, and can also be applied to sealing materials for aerospace vehicles and precision instruments, especially for vacuum, inert, etc. High temperature sealing material in gaseous or reducing gas environment.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a C / C composite material and a preparation method thereof. Background technique [0002] C / C composite material is a composite material with carbon fiber reinforced carbon matrix, and its entire system is composed of carbon elements, which has the advantages of both carbon material and fiber reinforced composite material. C / C composite materials not only have outstanding structural material properties such as low density, high specific modulus, and high specific strength, but also have excellent thermophysical properties and friction and wear properties, which can well meet the high temperature and high speed conditions of the aerospace industry. The following comprehensive performance requirements are the first choice for friction materials. At the same time, C / C composite materials have low expansion coefficient, low friction coefficient, excellent sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/84
CPCC04B35/83C04B2235/425C04B2235/77C04B2235/96
Inventor 李国栋胡姣孙晔华史琦张洋
Owner CENT SOUTH UNIV
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