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Method for preparing carbon-fiber-reinforced silicon carbide composite material

A composite material and silicon carbide technology, which is applied in the field of preparation of carbon fiber reinforced silicon carbide composite materials, can solve problems such as no obvious improvement, and achieve the effects of less dust deposition, good crystallization performance and cost reduction

Active Publication Date: 2011-11-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used cracking process is mainly based on atmospheric pressure or pressurized cracking. The existing research on vacuum cracking process is mainly concentrated in the first cycle, and the subsequent cycle is still using atmospheric cracking. The purpose is only to obtain better As a result, the high temperature resistance and oxidation resistance of the material obtained are equivalent to those obtained by atmospheric pressure cracking in each cycle, and there is no obvious improvement

Method used

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  • Method for preparing carbon-fiber-reinforced silicon carbide composite material
  • Method for preparing carbon-fiber-reinforced silicon carbide composite material
  • Method for preparing carbon-fiber-reinforced silicon carbide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a carbon fiber reinforced silicon carbide composite material of the present invention, comprising the following steps:

[0028] (1) Impregnation: prepare a three-dimensional four-way carbon fiber braid and place it in a pressure tank, evacuate the pressure tank to a pressure <500 Pa, and impregnate with a polycarbosilane-xylene solution with a mass concentration of 30% for 4 h;

[0029] (2) Drying: Take out the impregnated three-dimensional four-way carbon fiber braid and put it on the sample holder, and dry it at room temperature for 2 h;

[0030] (3) Cracking: Place the dried three-dimensional four-way carbon fiber braid in a high-temperature cracking furnace, vacuumize until the pressure in the cracking furnace is less than 50 Pa, raise the temperature to 1200°C at a heating rate of 10°C / min, and keep warm after reaching the temperature 120 min for pyrolysis; keep the vacuum pump on during the whole process of pyrolysis (including heating, heat...

Embodiment 2

[0033] A method for preparing a carbon fiber reinforced silicon carbide composite material of the present invention, comprising the following steps:

[0034] (1) Impregnation: Prepare the carbon fiber two-dimensional cloth body and place it in a pressure tank, evacuate the pressure tank to a pressure of <500 Pa, and impregnate it with a polycarbosilane-xylene solution with a mass concentration of 70% for 4 h;

[0035] (2) Drying: Take out the impregnated carbon fiber two-dimensional cloth body and place it on the sample rack, and dry it at room temperature for 2 h;

[0036] (3) Cracking: Place the dried carbon fiber two-dimensional cloth body in a high-temperature cracking furnace, vacuumize until the pressure in the cracking furnace is less than 50 Pa, and raise the temperature to 1200°C at a heating rate of 10°C / min. Keep warm for 120 min for cracking; keep the vacuum pump on during the cracking (the whole process includes heating up, keeping warm and cooling down);

[0037...

Embodiment 3

[0039] A method for preparing a carbon fiber reinforced silicon carbide composite material of the present invention, comprising the following steps:

[0040] (1) Impregnation: Prepare a three-dimensional four-way carbon fiber braid and place it in a pressure tank, evacuate the pressure tank to a pressure of <500 Pa, and impregnate it with a polycarbosilane-toluene solution with a mass concentration of 40% for 6 h;

[0041] (2) Drying: Take out the impregnated three-dimensional four-way carbon fiber braid and put it on the sample holder, and dry it at room temperature for 3 h;

[0042] (3) Cracking: Place the dried three-dimensional four-way carbon fiber braid in a high-temperature cracking furnace, vacuumize until the pressure in the cracking furnace is less than 50 Pa, raise the temperature to 1400°C at a heating rate of 20°C / min, and keep warm after reaching the temperature 60 min for pyrolysis; keep the vacuum pump on during the whole process of pyrolysis (including heating...

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Abstract

The invention discloses a method for preparing a carbon-fiber-reinforced silicon carbide composite material, and the method comprises the following steps: preparing a carbon-fiber woven fabric, and placing the carbon-fiber woven fabric under a vacuum condition with a pressure of less than 500 Pa, and then dipping the carbon-fiber woven fabric by using a polycarbosilane precursor solution for 2-12hours; drying the dipped carbon-fiber woven fabric in the air at room temperature; then placing the dried carbon-fiber woven fabric under a vacuum condition with a pressure of less than 500 Pa again,raising the temperature of the carbon-fiber woven fabric to 1000-1600 DEG C at a temperature rise speed of 1-30 DEG C / min, then carrying out heat preservation on the carbon-fiber woven fabric for 30-240minutes so as to carry out splitting decomposition on the carbon-fiber woven fabric; repeating a cycle of dipping, drying in the air and splitting decomposition until when a cycle is finished, the weight of a sample is increased by no more than 1% compared with that of the sample obtained when the last cycle is finished, thus a Cf / SiC composite material is obtained. The method disclosed by the invention has the advantages that no shielding gas atmosphere is required, and the dust on the surface of the sample can be reduced, thereby reducing the cleaning times of a furnace body and the sample, and the like; and by using the method disclosed by the invention, products with strong high-temperature resistant properties and high antioxidant properties can be provided.

Description

technical field [0001] The invention relates to the field of preparation of composite materials, in particular to a method for preparing carbon fiber reinforced silicon carbide composite materials. Background technique [0002] Carbon fiber reinforced silicon carbide (Cf / SiC) composite material combines the advantages of carbon fiber and SiC matrix, and has the characteristics of low density, high strength, high toughness, high temperature resistance, ablation resistance, erosion resistance, high hardness and high wear resistance, etc. It has broad application prospects in aerospace, energy technology, chemical industry, transportation industry and other fields. [0003] The performance of Cf / SiC composite mainly depends on the structure of the material, such as fiber state and distribution, matrix properties, interface conditions, etc., and the structure of the material is determined by the preparation process of the material. Among the various preparation processes of Cf / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 马青松简科徐天恒刘海韬陈朝辉
Owner NAT UNIV OF DEFENSE TECH
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