METHOD FOR OBTAINING SILICON CARBIDE FIBER FOR REINFORCING COMPOSITE MATERIALS Russian patent published in 2023 - IPC D01D5/88 

FIELD: carbon-silicon carbide materials.

SUBSTANCE: invention relates to the field of carbon-silicon carbide materials and can be used to reinforce composite materials used in aerospace engineering. The method includes continuous successive stages in the liquid phase by drawing a carbon filamentary product fixed on coils in a two-zone vacuum reactor to obtain a silicon carbide fiber containing a filamentary carbon core coated with a layer of amorphous silicon carbide and an outer layer of crystalline silicon. The carbon filamentary product is pulled through the first heating zone of the reactor containing the eutectic silicon-tellurium melt heated to a temperature above the liquidus temperature of the silicon-tellurium melt, preferably to a temperature of 440°C, with the formation of an amorphous silicon carbide layer on the surface. Then, a filamentous carbon product with a deposited amorphous silicon carbide layer is pulled through the second heating zone of the reactor containing a silicon-copper melt at a temperature below the liquidus temperature of the silicon-copper melt, preferably at a temperature of 820°C, with the formation of an outer layer of crystalline silicon.

EFFECT: invention makes it possible to obtain silicon carbide fibers for reinforcing composite materials with high strength and uniformity at low energy intensity and low temperature of synthesis.

5 cl, 1 dwg