FIELD: composites. SUBSTANCE: invention is designed for aerospace, high-temperature engineering, chemical and transport mechanical engineering, semiconductor engineering and nanotechnology. Ingredients are placed in reaction chamber coaxially to graphite heating rode made from carbon threads and pyrocarbon matrix. Chamber is fed by natural gas to create its concentration in reaction chamber 70 to 100 vol %, after which heating is launched and pyrocarbon matrix is precipitated using thermogradient gas-phase method for radially moving pyrolysis zone within temperature range 900-1000 C. Pyrolysis zone is displaced at velocity at least 0.03 mm/h. Temperature gradient is controlled by stopping heating when temperature of inside surface of framework exceeds 1380 C and by providing heat insulation of its outside surface. Natural gas overpressure is set equal to at least 11 mm Hg and its consumption to no more than 35 cu.m/h. When N frameworks are saturated with pyrocarbon, uniformity of heating in their height direction is ensured by central resistor-type heater with height-variable conductivity. Bulk density of material is 1.69-1.81 g/cu.cm, compression strength 140-220 MPa, coefficient of elasticity on compression 15.2- 31.6 GPa, gas permeation factor 3,37-1,28•10-10 sq.cm. EFFECT: optimized process parameters. 4 cl, 1 tbl, 6 ex
