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A method for low-temperature modification of c/c composite materials by ultrasonic-ultraviolet method

A technology of composite materials and carbon composite materials, which is applied in the field of low-temperature modification of C/C composite materials by ultrasonic-ultraviolet method, can solve the problems of C/C composite materials such as degradation of mechanical and thermal properties, protection failure, and volatile compounds. Achieve the effect of low raw material price, improved anti-oxidation performance, and improved anti-oxidation performance

Active Publication Date: 2014-10-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the development of matrix modification is relatively early, no breakthrough has been made, and there are some problems: on the one hand, the introduction of oxygen barrier components will lead to the decline of mechanical and thermal properties of C / C composites; on the other hand, at high temperature Under the environment, the compound of the oxygen barrier component is easy to volatilize, which will lead to the failure of the protection, so this method is limited to the anti-oxidation protection below 1000 °C

Method used

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  • A method for low-temperature modification of c/c composite materials by ultrasonic-ultraviolet method
  • A method for low-temperature modification of c/c composite materials by ultrasonic-ultraviolet method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) Take the 2D-carbon / carbon composite material used in aircraft brake pads and process it into 10×10×3mm 3 The small cubes were polished and chamfered on the surface, then cleaned with absolute ethanol and deionized water in an ultrasonic generator, and dried in an oven for later use;

[0022] 2) Mix the analytically pure tri-n-butyl borate and absolute ethanol at a volume ratio of 1:6, and keep stirring, record as A;

[0023] 3) Mix A with analytically pure acetic acid at a volume ratio of 2.5:1 and keep stirring to form a sol precursor, which is denoted as B;

[0024] 4) Add 10% ZrB of B mass to B 2 Powder, stir for 1-2 hours to form a uniform suspension C;

[0025] 5) Pour the suspension C into a four-neck round bottom flask, and place the 2D-carbon / carbon composite material in the suspension C, and put the equipped four-neck round bottom flask into a UWave-1000 microwave·ultraviolet· The ultrasonic trinity synthesis extraction reaction instrument is fixed, and t...

Embodiment 2

[0028] 1) Take the 2D-carbon / carbon composite material used in aircraft brake pads and process it into 10×10×3mm 3 The small cubes were polished and chamfered on the surface, then cleaned with absolute ethanol and deionized water in an ultrasonic generator, and dried in an oven for later use;

[0029] 2) Mix the analytically pure tri-n-butyl borate and absolute ethanol at a volume ratio of 1:4, and keep stirring, record as A;

[0030] 3) Mix A with analytically pure acetic acid at a volume ratio of 2:1, and keep stirring to form a sol precursor, which is denoted as B;

[0031] 4) Add 10% ZrB of B mass to B 2 Powder, stir for 1-2 hours to form a uniform suspension C;

[0032] 5) Pour the suspension C into a four-neck round bottom flask, and place the 2D-carbon / carbon composite material in the suspension C, and put the equipped four-neck round bottom flask into a UWave-1000 microwave·ultraviolet· The ultrasonic trinity synthesis extraction reaction instrument is fixed, and th...

Embodiment 3

[0035] 1) Take the 2D-carbon / carbon composite material used in aircraft brake pads and process it into 10×10×3mm 3 The small cubes were polished and chamfered on the surface, then cleaned with absolute ethanol and deionized water in an ultrasonic generator, and dried in an oven for later use;

[0036] 2) Mix the analytically pure tri-n-butyl borate and absolute ethanol at a volume ratio of 1:3, and keep stirring, record as A;

[0037]3) Mix A with analytically pure acetic acid at a volume ratio of 4:1 and keep stirring to form a sol precursor, which is denoted as B;

[0038] 4) Add 10% ZrB of B mass to B 2 Powder, stir for 1-2 hours to form a uniform suspension C;

[0039] 5) Pour the suspension C into a four-neck round bottom flask, and place the 2D-carbon / carbon composite material in the suspension C, and put the equipped four-neck round bottom flask into a UWave-1000 microwave·ultraviolet· The ultrasonic trinity synthesis extraction reaction instrument is fixed, and the ...

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Abstract

The invention relates to a method for modifying a C / C composite material at low temperature by an ultrasonic-ultraviolet process. According to the method for modifying a C / C composite material by a ZrB2 ultrasonic-ultraviolet process, by using ZrB2, tri-n-butyl borate, anhydrous ethanol and acetic acid as raw materials, the C / C composite material is subjected to oxidation resistance modification under different conditions according to a certain ratio, thereby enhancing the oxidation resistance of the C / C composite material at the low-temperature stage. The method is simple for technical control and convenient to operate, and has the advantages of low raw material cost and low reaction temperature; the generated oxidation-resistant precursor and matrix have favorable high-temperature thermal compatibility; the method has slight influence on mechanical properties of the material; and the modified C / C composite material has obviously higher oxidation resistance than the unmodified C / C composite material.

Description

technical field [0001] The invention relates to a method for modifying a C / C composite material, in particular to a method for modifying a C / C composite material at a low temperature by an ultrasonic-ultraviolet method, which can improve the oxidation resistance of the C / C composite material at a low temperature stage. Background technique [0002] C / C composite materials have mechanical properties and high temperature properties unmatched by other structural materials, so they are widely used in aviation, aerospace and other civil fields. C / C composites begin to oxidize in an aerobic environment around 370°C. As the temperature increases, the oxidation rate increases rapidly, and the performance of the material is seriously affected, which limits the application of C / C composites. Therefore, The oxidation resistance of C / C composites is the focus of current research. [0003] At present, there are two main anti-oxidation methods for carbon-carbon composite materials: (1) S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83
Inventor 曹丽云黄毅成黄剑锋费杰李翠艳孔新刚王程卢靖
Owner SHAANXI UNIV OF SCI & TECH
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