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A method for preparing a medium-low temperature and long-term oxidation-resistant coating on the surface of a carbon/carbon composite material

A technology of carbon composite material and anti-oxidation coating, which is applied in the field of anti-oxidation of carbon/carbon composite materials, and can solve the problems such as difficulty in achieving anti-oxidation of coating

Active Publication Date: 2018-04-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, low-temperature anti-oxidation coatings for carbon / carbon composites are mainly single-layer borosilicate and phosphate, and there are few literature or patent reports on double-layer coatings, and the reported coatings are difficult to achieve long-term Long-term anti-oxidation, especially in the range of 800-1000℃

Method used

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  • A method for preparing a medium-low temperature and long-term oxidation-resistant coating on the surface of a carbon/carbon composite material
  • A method for preparing a medium-low temperature and long-term oxidation-resistant coating on the surface of a carbon/carbon composite material
  • A method for preparing a medium-low temperature and long-term oxidation-resistant coating on the surface of a carbon/carbon composite material

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Effect test

Embodiment 1

[0030] The carbon / carbon sample is pretreated first. Choose a density of 1.6g / cm 3 The C / C composite material was polished with 400# silicon carbide sandpaper, ultrasonically oscillated in distilled water for 60 minutes, and then rinsed repeatedly with distilled water; the cleaned carbon / carbon composite material was dried at 160°C for 48 hours for later use.

[0031] Deposit a silicon carbide coating. The carbon / carbon sample after the above treatment is placed in a graphite crucible and placed in a chemical vapor deposition furnace for silicon carbide deposition. Small holes are drilled at the bottom of the graphite crucible to ensure gas circulation. The deposition temperature is 1000°C, the deposition pressure is 5mmHg, the flow rate of trichloromethylsilane (MTS) is 80g / h, and the flow rate of hydrogen gas is 0.04m 3 / h, argon gas flow rate 0.01m 3 / h. Take it out after 20 hours of deposition, turn it over and deposit it for another 20 hours. Increase the deposition ...

Embodiment 2

[0037] The carbon / carbon sample is pretreated first. Choose a density of 1.70g / cm 3 After polishing the C / C composite material with 120# and 400# silicon carbide sandpaper, ultrasonically oscillate in distilled water for 30 minutes, and then rinse repeatedly with distilled water; dry the cleaned carbon / carbon composite material at 120°C for 24 hours for later use .

[0038] Deposit a silicon carbide coating. The carbon / carbon sample after the above treatment is placed in a graphite crucible and placed in a chemical vapor deposition furnace for silicon carbide deposition. Small holes are drilled at the bottom of the graphite crucible to ensure gas circulation. The deposition temperature is 1200°C, the deposition pressure is 10mmHg, the flow rate of trichloromethylsilane (MTS) is 140g / h, and the flow rate of hydrogen gas is 0.16m 3 / h, argon flow rate 0.05m 3 / h. Take it out after 12 hours of deposition, turn it over and deposit it for another 12 hours. Co-deposition 4 tim...

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Abstract

The invention discloses a preparation method of a low-temperature long-time oxidation-resistant coating layer on carbon / carbon composite material surfaces, and belongs to the technical field of carbon / carbon composite material antioxidation. The preparation method comprises following steps: firstly, chemical vapor deposition is adopted so as to realize precipitation of high crystallinity silicon carbide on the carbon / carbon composite material surfaces as a transitional inner coating layer; boron oxide, boron carbide, silicon dioxide, and aluminium oxide are taken as coating layer raw materials, silica sol is taken as an adhesives, and painting-sintering technology is adopted so as to obtain a B4C-B2O3-SiO2-Al2O3 outer layer on the silicon carbide inner layer; and finally the SiC / B4C-B2O3-SiO2-Al2O3 composite oxidation-resistant coating layer is formed on the carbon / carbon composite material surfaces. The low-temperature long-time oxidation-resistant coating layer is capable of realizing long-term antioxidation of the carbon / carbon composite material at 600 to 1000 DEG C, and oxidation weight loss ratio is smaller than 1%. It is observed via observation using scanning electron microscopes, the low-temperature long-time oxidation-resistant coating layer is capable of forming compact glass phase at usage environment spontaneously, and realizing oxidation protection.

Description

technical field [0001] The invention relates to the technical field of anti-oxidation of carbon / carbon (C / C) composite materials, in particular to a method for preparing a medium-low temperature and long-term anti-oxidation coating on the surface of carbon / carbon composite materials. Background technique [0002] Carbon / carbon composite materials have the characteristics of high specific strength, good high-temperature mechanical properties, high thermal conductivity, small thermal expansion coefficient, and excellent thermal shock resistance, and are widely used in aerospace, nuclear industry, and civil fields. However, poor oxidation resistance is the fatal shortcoming of C / C composites, which will be oxidized by oxygen in the atmosphere above 450°C and its performance will be reduced. Studies have shown that when the oxidation weight loss rate of C / C composites reaches 1% and 10%, the material strength decreases by 10% and 30%, respectively, which greatly limits the appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 汤素芳胡成龙庞生洋王石军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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