Carbon ceramic composite material is a kind of ceramic matrix composite material, which is a new type of composite material with three-dimensional felt or woven body of carbon fiber as reinforcing skeleton and cracked carbon and silicon carbide ceramic as continuous matrix.
Carbon ceramic material not only has the advantages of high strength, high modulus, high hardness, impact resistance, oxidation resistance, high temperature resistance, acid and alkali resistance and all chemical corrosion resistance, small thermal expansion coefficient, light specific gravity and other advantages of high-performance ceramics, but also completely overcomes the shortcomings of general ceramic materials such as large brittleness and single function. It is recognized as an ideal high-temperature structural material, friction material and thermal protection material in the world.
The preparation processes of carbon ceramic composite materials mainly include chemical vapor infiltration (CVI), molten silicon infiltration (RMI) and precursor impregnation pyrolysis process (PIP). CVI process is mainly used to prepare carbon-carbon blanks, and RMI or PIP process is used to ceramicize carbon-carbon blanks to prepare carbon ceramic composite materials. The process flow chart is as follows:
Due to different preparation processes, carbon-ceramic composite materials prepared by PIP and RMI have certain differences. The mechanical properties of carbon-ceramic composite materials prepared by RMI are relatively poor, but the hardness is high, and the later processing is difficult. At the same time, it is easy to deform for thin-walled parts, but the cost is relatively low. It is mainly used to prepare some simple structural parts. It is currently used in the field of brake friction. The carbon-ceramic composite materials prepared by PIP have better uniformity, mechanical properties and processability, and a wide range of controllable properties, but the cost is relatively high. It is mainly used to prepare large parts, thin-walled parts and structural parts with high mechanical properties requirements. It is currently used in aerospace, thermal engineering fields, thermal structural parts and thermal protection parts, as well as brake friction fields.