Preparation method of composite ceramic coating for surface of carbon/carbon composite

Abstract

The invention relates to a preparation method of a composite ceramic coating for the surface of a carbon / carbon composite, and belongs to the technical field of aerospace. The preparation method specially comprises the steps of mixing Si powder with SiC powder and MoSi2 in molar ratio, adding a binder in a compounding ratio, and performing thorough mixing to obtain a mixture; adding deionized water to the mixture, performing blending to obtain viscous suspending liquid, allowing standing still, performing uniform stirring once again, and uniformly coating the suspending liquid onto the surfaceof the C / C composite, to form a precoated layer; performing air-drying prebaking treatment to form a carbon / carbon composite sample of which the surface is coated with an SiC-MoSi2 precoated layer, and putting the carbon / carbon composite sample in a mould for calcining, wherein the SiC-MoSi2 precoated layer and the carbon / carbon composite sample basal body are subjected to a chemical reaction, sothat the SiC-MoSi2 composite ceramic coating for the surface of the carbon / carbon composite is prepared. The SiC-MoSi2 composite ceramic coating for the surface of the carbon / carbon composite prepared according to the preparation method disclosed by the invention is tightly combined with the basal body through test with a scanning electron microscope and a metallographical microscope, and has favorable oxidation resistance and burning erosion resistance.

Description

Technical field: [0001] The invention belongs to the field of aerospace technology, and specifically relates to a method for preparing a composite ceramic coating on the surface of a carbon / carbon composite material. Background technique: [0002] After entering the 21st century, carbon / carbon (C / C) composite materials have become well-known functional materials and structural materials, and have been developed by leaps and bounds, with their application scope and performance increasing year by year. C / C composite material has excellent performance and is a very important material in the aerospace field. Its development is mainly driven by the requirements of the missile and aerospace industries. Therefore, the most widely used field is the aerospace field. When intercontinental missiles, manned spacecraft, etc. return to the earth at high speed and pass through the atmosphere, friction with the atmosphere will generate a lot of heat energy. Therefore, the surface of the aircraft...

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Problems solved by technology

When intercontinental missiles, manned spacecraft, etc. return to the earth at high speed and pass through the atmosphere, friction with the atmosphere will generate a lot of heat energy. Therefore, the surface of the aircraft must be made of materials with excellent heat resistance to resist extremely high temperature and harsh environments. Ordinary high melting point metals and metal compounds are also difficult to withstand

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