Carbon/carbon composite material oxidation-proof coating

Abstract

The invention is about a kind of carbon / carbon compound material anti-oxidation smear layer which is constituted by the bottom layer and the outer layer. Dissolving 0.5-2g Al(OH)3 and 5-15g Zn3(PO4)2.4H2O respectively in the H3PO4 solution, adding water after the solution gets transparent, smearing the solution on the surface of carbon / carbon compound material and heating under the cover of nitrogen or vacuum to get the bottom layer. Dissolving 10-15g Na2B4O7.10H20 into 10-50ml glycerin, adding 10-50g SiO2 powder and 1-10g B powder respectively in the solution, diluting the solution and smearing it on the bottom layer of the carbon / carbon compound material, drying at 200DEG C for 1h to get the outer layer. The smear layer has good anti-oxidation effects; it is especially applicable to the protection of non-friction parts on plane's carbon / carbon compound material. The smear layer is atoxic and no stimulating smell, it's helpful to help the environment as well as the construing workers.

Description

technical field [0001] The invention is a carbon / carbon composite material anti-oxidation coating, which belongs to the technical field of high-temperature anti-oxidation coatings. Background technique [0002] Carbon / carbon composites are a class of advanced composite materials with low density, excellent high-temperature mechanical properties, and good fracture toughness, and have been widely used in aviation and aerospace fields. However, the carbon / carbon composite material has a serious defect, that is, the high temperature oxidation resistance is poor, and the oxidation speed is relatively fast above 450 °C, and the oxidation becomes more and more serious as the temperature rises. [0003] At present, the vast majority of carbon / carbon composite materials are used as aircraft brake disc materials. The temperature of the brake disc may be very high (over 900°C) when the aircraft brakes. Oxidation measures. [0004] Phosphate-based anti-oxidation coatings and related i...

AI Technical Summary

Problems solved by technology

However, this kind of high-temperature coating is not suitable for long-term application in low-temperature environments due to the difference in expansion coefficient and the expansion coefficient of carbon / carbon composites that causes cracks at low temperatures.

[0006] When using a phosphate-based composite anti-oxidation coating, the resin is an important component, and the diluent is usually toxic, sometimes accompanied by a strong pungent smell during the construction process, and the operating environment needs to have better ventilation. But it can also harm the environment and human health