METHOD FOR PRODUCING A CARBON-CARBON COMPOSITE MATERIAL BASED ON A MULTIDIRECTIONAL REINFORCING FRAME MADE OF CARBON FIBER Russian patent published in 2023 - IPC C04B35/83 C04B35/524 

FIELD: composite materials.

SUBSTANCE: invention relates to the field of development and production of carbon-carbon composite materials (CCCM) based on a carbon matrix formed from coal pitches during carbonation and subsequent high-temperature treatments, and reinforcing carbon fiber frames. The proposed method includes sequential processes of creating a multidimensional carbon fiber workpiece frame, placing the workpiece frame in an impregnating container with possible fixation in a crimping tool that eliminates distortion of the shape and reinforcing structure, filling the free space of the container with coal pitch, impregnating the reinforcing frame with molten pitch, carbonation in gas-static equipment under pressure and high-temperature processing of the workpiece in vacuum, with repeating these processes until a material with a density of more than 1.91 g/cm³ is obtained. The contact pressure during impregnation at the stage of heating the workpiece to a temperature corresponding to the minimum viscosity of the pitch is 0.1-0.4 MPa, and the pressure during carbonization during the first sealing cycle does not exceed 10 MPa, and at each subsequent cycle increases so that its level does not exceed the value of the compressive strength of the workpiece material determined after the previous cycle seals. The multidirectional reinforcing frame can have a rod or braided structure. High-temperature coal pitch or a combination of medium-temperature and high-temperature coal pitch can be used to impregnate the workpiece.

EFFECT: exclusion of distortions of the shape and reinforcing structure of the workpiece, reduction of energy and labor costs, as well as increasing the stability of the micro- and macrostructure of the ССCM, density and increasing the physical and mechanical properties of the ССCM.

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