METHODS OF MAKING SEALED ARTICLES FROM COMPOSITE MATERIALS (VERSIONS) AND HOUSING OF HIGH-TEMPERATURE CHEMICAL REACTOR MADE BY THESE METHODS Russian patent published in 2024 - IPC C04B35/577 C04B35/573 B32B18/00 

FIELD: various technological processes.

SUBSTANCE: group of inventions relates to methods of making sealed articles from composite carbon-silicon carbide materials, which are intended for fabrication of high-temperature chemical reactor housings from them used in chemical, chemical-metallurgical and other industries. Method of making a sealed article involves making an inner shell from a carbon-carbon composite material (CCCM) based on low-modulus carbon fibres and a pyrocarbon or coke-pyrocarbon matrix and its sealing by forming on its surfaces a pyrocarbon coating with a sublayer based on a material which is graphite on a pyrocarbon binder, and then forming an outer shell on top of it, when forming a frame of which low-modulus carbon fibres are used as a reinforcing filler, and the matrix used is a pyrocarbon or coke-pyrocarbon matrix obtained during saturation of the frame or carbonised carbon fibre reinforced polymer with pyrocarbon from the gas phase. Prior to forming the outer shell frame, a layer of graphite foil is glued to the outer surface of the inner shell over the pyrocarbon coating. Saturation of frame or workpiece of outer shell from carbonised carbon fibre reinforced polymer with pyrocarbon is carried out only partially, thereafter, workpiece of outer shell from CCCM is siliconised by vapour-liquid-phase method by impregnation of silicon vapour condensate with its subsequent carbidisation, excluding access of silicon vapours to inner surface of inner shell. Another version of the method includes the same operations, wherein a pyrocarbon coating with a sublayer based on a material representing graphite on a pyrocarbon binder is formed on the inner surface of the inner shell. Housing of the chemical reactor consists of inner and outer shells, of which the inner shell is made of CCCM, and a sealing layer located between them. Outer shell is made of a sealed carbon-silicon-carbide composite material; the sealing layer is a two-layer coating of pyrocarbon and silicon carbide or a single-layer coating of silicon carbide.

EFFECT: high resistance of the reactor in chemically aggressive media and in an oxidising medium.

4 cl, 2 ex