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Preparation method of C/C composite material high-temperature oxidation resistant coating

A high-temperature anti-oxidation and composite material technology, which is applied in the field of high-temperature-resistant coating preparation, can solve the problems of inability to deposit coatings, poor electrical conductivity, and increased difficulty, so as to change the breakdown discharge mechanism, improve electrical conductivity, and reduce costs. Effect

Active Publication Date: 2018-06-12
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Application Information

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Problems solved by technology

This method usually uses materials with good conductivity as electrode materials. For example, there have been a large number of reports on the preparation of oxide coatings on metal substrates by cathode plasma electrolysis. Metal materials have good conductivity and can better realize cathode discharge. As a cathode material, it is easy to deposit oxide coatings, and compared with metals, the conductivity of C / C composites is poor. If the above method is used, C / C composites will basically not be able to discharge, resulting in the C / C composites. The difficulty of preparing oxide coatings increases, and the coatings are basically impossible to deposit, which limits the application of cathodic plasma electrolysis technology on C / C composite materials. related reports

Method used

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  • Preparation method of C/C composite material high-temperature oxidation resistant coating

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Effect test

Embodiment 1

[0039] Configure Y (NO 3 ) 3 with Al(NO 3 ) 3 The molar ratio is 3:1, the total concentration is 1mol / L aqueous solution, add 10g / L nano-silicon powder, high-purity graphite is used as anode, C / C composite material is used as cathode, and the surface area ratio of anode and cathode is 2:1. Such as figure 1 shown. Turn on the pulse power supply and adjust the voltage to 120V, the deposition time is 5min, and the solution temperature is maintained at 20±5°C. After the preparation is completed, put it into a vacuum sintering furnace for sintering, the sintering temperature is 1600° C., and the sintering time is 3 hours. The final coating thickness obtained was 86 μm with a porosity of 14.9%.

Embodiment 2

[0041]The same process as in Example 1 was adopted, the deposition voltage was 150V, the deposition time was 5 min, and the same sintering process as in Example 1 was adopted. The final coating thickness obtained was 88 μm with a porosity of 15.5%.

Embodiment 3

[0043] The same process as in Example 1 was adopted, the deposition voltage was 150V, the deposition time was 10 min, and the same sintering process as in Example 1 was adopted. The final coating thickness obtained was 98 μm with a porosity of 14.9%.

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Abstract

The invention provides a preparation method of a C / C composite material high-temperature oxidation resistant coating. The oxidation resistant coating is prepared on the surface of a C / C composite material through a cathode plasma electrolysis method, and the coating is prepared through traditional thermal spraying, physical vapor deposition and chemical vapor deposition; the method is simple in required equipment, simple in operation and low in cost, and the coating with different ingredient proportions can be obtained by adjusting the ingredients of the solution. The cathode plasma electrolysis method adopted in the invention is applicable for preparing the coating on small devices with complex shapes, the high-temperature oxidation protection problem of the C / C composite material is effectively solved, and simultaneously, a novel research idea can also be provided for the preparation of the oxide coating used for the C / C composite material.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature anti-oxidation coating of a C / C composite material, and belongs to the technical field of high-temperature anti-oxidation coating preparation. Background technique [0002] C / C composite material has the advantages of low density, high specific strength, thermal shock resistance, etc., and is an ideal thermal structural material. However, C / C composites begin to oxidize in an oxidizing atmosphere exceeding 370°C, and the oxidation rate increases rapidly when the temperature is higher than 500°C, and the rapid oxidation leads to a decrease in the mechanical properties of the material, which limits its use as high temperature protection or ablation resistance. Wide range of applications of materials in oxidizing atmospheres. Therefore, in order for C / C composites to be widely used in oxidizing environments, reliable anti-oxidation protection at high temperatures is crucial. Preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/84C04B41/87
CPCC04B35/83C04B41/009C04B41/5045C04B41/87C04B41/5031C04B41/5096C04B41/4564C04B41/0072C04B41/4558
Inventor 王鹏于新民李晓东王涛孙同臣刘俊鹏
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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