METHOD OF PRODUCING MULTIFUNCTIONAL CERAMIC MATRIX COMPOSITE MATERIALS (VERSIONS) Russian patent published in 2016 - IPC C04B35/596 C04B35/577 

FIELD: chemistry.

SUBSTANCE: invention relates to production of multifunctional composite materials with ceramic matrix of silicon carbonitride, formed on a base of porous reinforcing frame, made from carbon fabric or fibre in form of threads, bundles or layered filaments with a continuous or discrete structure. Such materials are used in power heat-loaded parts of aircraft, combustion chambers and other items for aerospace and aviation equipment. Disclosed method of producing multifunctional ceramic matrix composite materials in volume of porous reinforcing frame, made from carbon fabric or fibre in form of threads, bundles and layered filaments with a continuous or discrete structure, comprises forming a ceramic matrix of silicon carbonitride by chemical vapour deposition (CVD) of silane with nitrogen-bearing precursor to preset density and process of multiple cyclic impregnation of frame with preceramic polymer (silazane) with subsequent polymerisation and pyrolysis (SPP). Chemical deposition is carried out in gas-vacuum furnace at temperature 500…900 °C and pressure of 50…500 Pa, and repeated (from 2 to 4 times) cyclic impregnation of frame with preceramic polymer and subsequent polymerisation and pyrolysis is performed in vacuum compression furnaces at temperature of up to 1,600°C and pressure of up to 20 MPa. Another version of method comprises first a step of SPP, and then CVD.

EFFECT: technical result of patented versions of method is production of ceramic matrix composite materials with density in range of 1,8- 2,1 g/cm³, resistance to mechanical and thermal cyclic loads and level of oxidation resistance at 400-1,400 °C.

10 cl, 2 tbl, 3 ex