METHOD FOR MANUFACTURING A CERAMIC MULTILAYER TUBE FOR THE SHELL OF A FUEL ELEMENT OF A NUCLEAR POWER PLANT Russian patent published in 2021 - IPC G21C3/07 

FIELD: nuclear power industry.

SUBSTANCE: invention relates to nuclear power. The method involves the sequential formation of layers. The inner monolithic layer is formed of crystals of stoichiometric silicon carbide, β-phase on a carbon substrate. The central composite layer is formed on the inner monolithic layer, for this purpose, continuous stoichiometric silicon carbide fibers of the β-phase are strung into bundles, the bundles are directed to biaxial or triaxial weaving into a cord-weaving machine and a reinforcing thread frame is formed in the form of a long cord. The long cord is stretched over the inner monolithic layer. The interface coating of pyrocarbon with a thickness of 100÷200 nm on a long cord is increased by the method for chemical deposition from the methane gas phase in a sealed tubular reactor of gas phase deposition with a hot wall. Then a matrix consisting of crystals of stoichiometric silicon carbide, β-phase is formed inside a long cord by chemical deposition from the gas phase of methylsilane in the mentioned reactor. The outer protective monolithic layer with a thickness of 100 microns is formed from crystals of stoichiometric silicon carbide, β-phase.

EFFECT: invention makes it possible to increase the strength mechanical properties of the resulting product.

16 cl, 9 dwg, 1 tbl