TECHNIQUE OF HIGH-STRENGTH AND HIGH-MODULUS CARBON FIBER RECEIVING Russian patent published in 2009 - IPC D01F9/22 D01F9/12 D01F9/14 

FIELD: metallurgy.

SUBSTANCE: invention concerns technique of high-strength, high-modulus carbon fibers receiving. Method includes oxidation of precursor and its further high-temperature processing under tension, providing fiber drawing out. Beforehand fiber-precursor is processed by microwave radiation. Then at the first stage of thermal treatment it is implemented oxidation of fibers in nonequilibrium low-temperature plasma till receiving of fibers with consistency value 1.38-1.43 g/cm³. At the second stage thermal treatment is implemented in inert atmosphere at pressure from 20 till 750 torr or in vacuum with pressure lower than 10^-2 torr, at that oxidised fiber till 400-450°C. At the third stage fiber is heated till temperature 600-650°C. At the fourth stage of thermal treatment fiber is processed at temperature 1100-4500°C. Received high-strength, high-modulus carbon fibers allows strength 400-510 kg/mm² and modulus of elasticity 39000-49000 kg/mm².

EFFECT: it is provided continuity of fiber receiving that provides improving of productivity and energy consumption reduction at receiving of fiber.

4 cl, 2 tbl