Carbon fiber reinforced boron nitride composite and preparation method thereof

A composite material and carbon fiber technology, which is applied in the field of precursor-converted carbon fiber reinforced boron nitride composite material and its preparation, and achieves the effects of simple preparation process, high ceramic conversion rate and good high temperature resistance performance.

Active Publication Date: 2011-09-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is not applicable to the preparation of fiber fabric reinforced composite materials

Method used

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  • Carbon fiber reinforced boron nitride composite and preparation method thereof
  • Carbon fiber reinforced boron nitride composite and preparation method thereof
  • Carbon fiber reinforced boron nitride composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select T300 carbon fiber and weave it into a three-dimensional four-way structure three-dimensional fabric, in which the fiber volume fraction is 33%;

[0021] Put the fabric in a sealable container, vacuumize it, suck the liquid borazine into the container, and soak for 1 hour; the final impregnation amount is based on the liquid level being higher than the fabric;

[0022] Then place it in a closed autoclave with a pressure of 4MPa, heat it to 80°C under the protection of an inert atmosphere, and keep it warm for 55 hours to make the liquid borazine cross-linked and solidified;

[0023] Put the cured product in a vacuum cracking furnace at 1200°C, and keep it warm for 2 hours;

[0024] The above impregnation-crosslinking-cracking process was repeated for 3 cycles to obtain carbon fiber reinforced boron nitride composite material.

[0025] The performance of the three-dimensional four-way carbon fiber (T300) fabric reinforced boron nitride composite material prepared ...

Embodiment 2

[0028] a. Select T300 carbon fiber and weave it into a three-dimensional fabric with a 2.5-dimensional structure (between two-dimensional and three-dimensional), in which the fiber volume fraction is 40%.

[0029] b. Fully immerse borazine into the carbon fiber fabric under vacuum conditions, then place it in a closed autoclave (pressure 7MPa), heat it to 100°C under the protection of an inert atmosphere, and keep it warm for 35 hours to make the liquid borazine Joint curing;

[0030] a. Select T300 carbon fiber and weave it into a three-dimensional fabric with a 2.5D structure, in which the fiber volume fraction is 40%.

[0031] b. Fully immerse the borazine into the carbon fiber fabric under vacuum conditions, then place it in a closed autoclave, heat it to 100°C under the protection of an inert atmosphere, and keep it warm for 35 hours to crosslink and solidify the liquid borazine;

[0032] c. Place the cured product in a vacuum cracking furnace with a cracking temperature...

Embodiment 3

[0035] a. Select T700 carbon fiber and weave it into a three-dimensional five-dimensional fabric with a fiber volume fraction of 30%.

[0036] b. Fully immerse borazine into the carbon fiber fabric under vacuum conditions, then place it in a closed autoclave (pressure 4MPa), heat it to 100°C under the protection of an inert atmosphere, and keep it warm for 35 hours to make the liquid borazine Joint curing;

[0037] c. Place the cured product in a vacuum cracking furnace with a cracking temperature of 1500°C and keep it warm for 1 hour;

[0038] d. Repeat the impregnation-crosslinking-cracking process for 2 cycles to obtain a carbon fiber reinforced boron nitride composite material with relatively high porosity.

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Abstract

A carbon fiber reinforced boron nitride composite and a preparation method thereof belong to the field of the ceramic-based composites. The carbon fiber reinforced boron nitride composite uses a carbon fiber as a reinforcement body; and the liquid borazine precursor of which the B/N atomic ratio is 1:1 is converted to a boron nitride matrix. The preparation method comprises the following steps: the carbon fiber is weaved into a three-dimensional fabric, the liquid borazine of which the B/N atomic ratio is 1:1 is completely soaked in the carbon fiber fabric at 80-120 DEG C under 1-15MPa, the temperature is kept for 10-70 hours to crosslink and solidify the liquid borazine; and the product obtained through solidifying is cracked, soaked, crosslinked and cracked again for 2-6 times to prepare the finished product. The carbon fiber reinforced boron nitride composite is a new structure/function integrating material suitable for the aviation and aerospace field and has good high temperatureresistance, oxidation resistance and ablation resistance.

Description

technical field [0001] The invention relates to the field of ceramic matrix composite materials, in particular to a precursor transformed carbon fiber reinforced boron nitride composite material and a preparation method thereof. Background technique [0002] As an important material in the aerospace field, carbon / carbon composites still have insurmountable defects, and their poor oxidation resistance greatly limits their use. Based on the above reasons, it is imperative to find more excellent high temperature resistant materials. [0003] With the advancement of material technology, nitride ceramic materials have entered people's field of vision. Nitride ceramics, such as silicon nitride, boron nitride, etc., all have good high temperature performance, thermal shock resistance, oxidation resistance, friction resistance and so on. Boron nitride ceramics have very similar physical properties to carbon materials, but their oxidation resistance is significantly improved compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/5835C04B35/622
Inventor 李斌张长瑞曹峰王思青曹英斌
Owner NAT UNIV OF DEFENSE TECH
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