METHOD FOR OBTAINING CARBON-CARBON COMPOSITE MATERIALS FROM CARBON FIBER REINFORCED PLASTIC WITH PHTHALONITRILE MATRICES Russian patent published in 2021 - IPC C04B35/524 C04B35/64 C01B32/05 

FIELD: composite materials.

SUBSTANCE: invention can be used in aircraft construction, chemical industry, metallurgy. To obtain carbon-carbon composite materials (CCCM) from carbon fiber plastics with phthalonitrile matrices, carbon filler is impregnated with a phthalonitrile binder twice, followed by carbonization of the samples in a non-oxidizing atmosphere. In this case, the samples are first heated to a temperature of 1000±5°C, and again to 1800±10 °C. Heating is carried out at a speed of 0.1-2 °C / min with an exposure time of 1-10 hours. After that, the process of pyronsaturation of the resulting material is carried out in a methane atmosphere at a temperature of 1800±10°C for 1-10 hours. A carbon-carbon composite material obtained by this method is proposed.

EFFECT: invention makes it possible to obtain CCCM characterized by interlayer shear strength of 9.3 - 9.6 MPa, porosity of 0.1 - 0.3%, density of 1.72 - 1.74 g / cm3, compressive strength of 79.5 - 93, 6 MPa, and modulus of elasticity of 12.0 - 13.8 GPa.

8 cl, 1 tbl, 25 ex, 1 dwg