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Preparation method of boron sol/gel solvothermal modified carbon/carbon composite material

A carbon composite material and solvothermal technology, which is applied in the field of boron sol/gel solvothermal modification of carbon/carbon composite materials, can solve the problems of complex preparation process and high cost

Active Publication Date: 2012-06-13
北生星晟科技发展(启东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The matrix replacement method mainly uses materials with anti-oxidation properties to fill the C / C composite material to replace part of the matrix carbon of the C / C composite material, thereby improving the anti-oxidation performance, but these methods are relatively expensive and the preparation process is complicated.

Method used

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  • Preparation method of boron sol/gel solvothermal modified carbon/carbon composite material
  • Preparation method of boron sol/gel solvothermal modified carbon/carbon composite material

Examples

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Embodiment 1

[0020] 1) Mix and stir tri-n-butyl borate and acetic acid to form a mixed solution A; fully mix absolute ethanol and deionized water to get a mixed solution B; add solution A dropwise to solution B, and keep stirring to get a mixed solution C;

[0021] Wherein the volume ratio of tri-n-butyl borate to acetic acid, dehydrated alcohol and deionized water is 4:1:8:4;

[0022] 2) Then add ammonia water and hydrochloric acid dropwise to the mixed solution C to adjust its pH value to 3, and age at 40°C for 48 hours to form a stable B 2 o 3 Sol / gel systems;

[0023] 3) put B 2 o 3 Pour the sol / gel system into the solvent heat kettle container, control the filling ratio to 50-80%, and then cut the carbon / carbon composite material to be modified into samples with a size of 8×8×8mm, and use No. 400 , No. 800 and No. 1000 sandpapers were polished and polished in turn, then ultrasonically cleaned with absolute ethanol and distilled water respectively, and then dried and put into a co...

Embodiment 2

[0026] 1) Mix and stir tri-n-butyl borate and acetic acid to form a mixed solution A; fully mix absolute ethanol and deionized water to get a mixed solution B; add solution A dropwise to solution B, and keep stirring to get a mixed solution C;

[0027] Wherein the volume ratio of tri-n-butyl borate to acetic acid, dehydrated alcohol and deionized water is 6:2:5:3;

[0028] 2) Then add ammonia water and hydrochloric acid dropwise to the mixed solution C to adjust its pH value to 2, and age at 30°C for 40 hours to form a stable B 2 o 3 Sol / gel systems;

[0029] 3) put B 2 o 3 Pour the sol / gel system into the solvent heat kettle container, control the filling ratio to 50-80%, and then cut the carbon / carbon composite material to be modified into samples with a size of 8×8×8mm, and use No. 400 , No. 800 and No. 1000 sandpapers were polished and polished in turn, and then ultrasonically cleaned with absolute ethanol and distilled water respectively, and then dried and put into ...

Embodiment 3

[0031] 1) Mix and stir tri-n-butyl borate and acetic acid to form a mixed solution A; fully mix absolute ethanol and deionized water to get a mixed solution B; add solution A dropwise to solution B, and keep stirring to get a mixed solution C;

[0032] Wherein the volume ratio of tri-n-butyl borate to acetic acid, dehydrated alcohol and deionized water is 8:4:10:2;

[0033] 2) Then add ammonia water and hydrochloric acid dropwise to the mixed solution C to adjust its pH value to 5, and age at 50°C for 20 hours to form a stable B 2 o 3 Sol / gel systems;

[0034] 3) put B 2 o 3Pour the sol / gel system into the solvent heat kettle container, control the filling ratio to 50-80%, and then cut the carbon / carbon composite material to be modified into samples with a size of 8×8×8mm, and use No. 400 , No. 800 and No. 1000 sandpapers were polished and polished in turn, then ultrasonically cleaned with absolute ethanol and distilled water respectively, and then dried and put into a co...

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Abstract

The invention relates to a preparation method of a boron sol / gel solvothermal modified carbon / carbon composite material. The method comprises the following steps: 1, mixing and stirring tributyl borate and acetic acid to form a mixed solution A; 2, fully mixing waterless ethanol and deionized water to obtain a mixed solution B; 3, adding the solution A to the solution B drop by drop to obtain a mixed solution C; 4, adding ammonia water and hydrochloric acid to the mixed solution C drop by drop to adjust the pH value of the mixed solution C, heat-stirring, and aging to obtain a stable B2O3 sol / gel system; and 5, dumping the B2O3 sol / gel system into a hydrothermal kettle container, putting a carbon / carbon composite material to be modified into the container, and carrying out a hydrothermal reaction to obtain the modified carbon / carbon composite material. According to the invention, a sol / gel liquid precursor is adopted to dip a matrix material (the carbon / carbon composite material to bemodified), and the liquid precursor can enter the internal of the carbon / carbon matrix through actions of pressure, diffusion, dissolution, reaction and the like and fill apertures of the carbon / carbon matrix to resist a reaction of the carbon matrix with oxygen in the high-temperature high-pressure solvothermal reaction process.

Description

technical field [0001] The invention relates to a method for modifying carbon / carbon materials, in particular to a method for thermally modifying carbon / carbon composite materials with boron sol / gel solvents. Background technique [0002] Carbon / carbon composites (referred to as C / C composites) is currently a research hotspot in the field of advanced composite materials in the world. It has a series of advantages, such as light weight, high temperature resistance, large energy absorption, and good friction performance. Aviation, aerospace and many civilian fields are widely used. The most striking application of C / C composite materials is the anti-oxidation C / C nose cone cap and wing leading edge of the space shuttle. The largest amount of C / C composite products is Brake pads for supersonic aircraft. The development of C / C composite materials is also closely related to the stringent requirements of aerospace technology. In the past ten years, the research on C / C composites...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 黄剑锋朱佳曹丽云
Owner 北生星晟科技发展(启东)有限公司