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High-temperature protective coating of C/C composite material and preparation method

A protective coating and composite material technology, which is applied in the field of composite materials, can solve the problems of structural performance degradation, inevitable formation of voids, easy oxidation and decomposition, etc., and achieve good high temperature resistance, prolong high temperature protection time, and good densification effect

Inactive Publication Date: 2018-09-07
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ZrB prepared by plasma spraying 2 There are some key problems in the base protective coating: 1) ZrB in the spraying process 2 Easy to oxidize and decompose, the resulting molten product (B 2 o 3 , with a melting point of 450°C) will volatilize in large quantities above 1000°C, resulting in uneven composition of the coating and a decrease in structural performance
2) Molten ZrB 2 After hitting the substrate at high speed, flattened particles are formed, and they pile up to form a coating. These flattened piles inevitably form gaps, resulting in low density of the coating.
3) In the high temperature protection of about 1600 ℃, ZrO formed by coating oxidation 2 Prone to crystal transformation, resulting in volume changes that will produce pores or cracks, resulting in coating failure
However, the patent does not involve the oxidative decomposition of the powder during the spraying process.

Method used

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  • High-temperature protective coating of C/C composite material and preparation method
  • High-temperature protective coating of C/C composite material and preparation method
  • High-temperature protective coating of C/C composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step is compound processing of raw material powder;

[0029] (1) ZrB activated by cetyltrimethylammonium bromide 2 Add the powder into deionized water, ultrasonically disperse for 1 hour, and configure a dispersion liquid with a mass percentage of 15%; (2) configure cerium nitrate into a 0.5mol / L aqueous solution, and evenly add it dropwise to the dispersion liquid configured in step (1) and stirring; (3) Add ammonium acetate dropwise to the mixed solution in step (2) to keep the pH of the solution at 8, meanwhile stir vigorously at 90°C, react for 2 hours and then age, so that the cerium salt precursor can be evenly assembled to ZrB 2 Particle surface; (4) Wash the reactant in the previous step, centrifuge, and roast at 400° C. for 2 hours to obtain the desired powder. The second step is the agglomeration and granulation of powder;

[0030] Disperse the powder compounded in the previous step in deionized water, add dispersant and binder in sequence, disper...

Embodiment 2

[0034] The first step is the composite treatment of the original powder;

[0035] (1) ZrB activated by cetyltrimethylammonium bromide 2 Add the powder into deionized water, ultrasonically disperse for more than 1 hour, and configure a dispersion liquid with a mass percentage of 15%; (2) configure yttrium nitrate into a 0.5mol / L aqueous solution, and evenly add it dropwise to the dispersion liquid configured in step (1) (3) Add ammonium acetate dropwise to the mixed solution in step (2) to keep the pH of the solution at 7, and at the same time stir vigorously at 90°C, react for 2 hours and age to make the yttrium salt precursor uniform Assembled to ZrB 2Particle surface; (4) Wash the reactant in the previous step, centrifuge, and roast at 600° C. for 2 hours to obtain the desired powder.

[0036] The second step is the agglomeration and granulation of powder;

[0037] Disperse the powder compounded in the previous step in deionized water, add dispersant and binder in turn, d...

Embodiment 3

[0041] The first step is compound processing of raw material powder;

[0042] (1) ZrB activated by sodium hexametaphosphate 2 Add the powder into deionized water, ultrasonically disperse for more than 1 hour, and configure a dispersion liquid with a mass percentage of 15%; (2) configure cerium nitrate into a 0.5mol / L aqueous solution, and evenly add it dropwise to the dispersion liquid configured in step (1) (3) Add ammonium acetate dropwise to the mixed solution in step (2) to keep the pH of the solution at 7, and at the same time stir vigorously at 90°C, react for 2 hours and age to make the cerium salt precursor uniform Assembled to ZrB 2 Particle surface; (4) Wash the reactant in the previous step, centrifuge, and roast at 400° C. for 2 hours to obtain the desired powder.

[0043] The second step is the agglomeration and granulation of powder;

[0044] Disperse the powder compounded in the previous step in deionized water, add a dispersant and a binder in sequence, disp...

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Abstract

The invention belongs to the field of materials and discloses a high-temperature protective coating of a C / C composite material and a preparation method. The protective coating is characterized in that a layer of rare earth oxide in a range of 200-500 nm is induced to be assembled on the surface of ZrB2 powder with particle size of 3-5 mu m by pretreatment. In the plasma spraying process, the layer is melted firstly to stop oxygenolysis of ZrB2 particles and depositing on a substrate; the first melted rare earth oxide fills gaps where the ZrB2 particles are flattened and stacked, and compactness of the coating is improved; in the high-temperature protection process, the rare earth oxide layer can stabilize oxidation product ZrO2, pores or cracks caused by crystal transformation are avoided, and accordingly, high-temperature protection time of the coating is prolonged. The obtained high-temperature protective coating has uniform composition and compact structure, and can resist ablation of 1600 DEG C high-speed airflow for 800 s or longer, and the mass loss rate of the coating is lower than -2.0*10<-4> g / s.

Description

technical field [0001] The invention relates to a high-temperature protective coating of a C / C composite material and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] Carbon fiber reinforced carbon matrix composites (also known as C / C composites) not only overcome the shortcomings of low strength of general carbon-graphite materials, but also have a series of excellent properties such as high specific strength, high specific modulus, low thermal expansion coefficient, and low density. It has been widely used in the hot-end parts of high-tech aerospace fields such as solid rocket motor (SRM) nozzles, thermal protection systems of supersonic vehicles, and missile nose cones. However, the oxidation of C / C composites at high temperature has become a fatal obstacle to their wide application. Studies have shown that when the oxidative ambient temperature exceeds 400 °C, the carbon matrix and carbon fiber structure in C / C c...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B41/5045C04B41/5042C04B35/83
Inventor 刘学璋章丽伟
Owner JIANGXI SCI & TECH NORMAL UNIV