METHOD FOR PRODUCING CARBON-CARBON COMPOSITE MATERIAL ON PITCH MATRICES Russian patent published in 2021 - IPC C04B35/532 C04B35/83 C04B35/64 C01B32/05 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of mechanical engineering and the production of carbon-carbon composite materials (CCCM), which can be used to complete heavily loaded friction units under conditions of high energy loading and an oxidizing environment. The method for producing a carbon-carbon composite material includes annealing of the initial molded blanks based on carbon fibers and pitch binders, subsequent intermediate high-temperature treatment, liquid-phase compaction of the obtained porous blanks with pitch, carbonization under pressure, and final heat treatment. Firing of the original workpieces is carried out in a heating mode in the temperature range of 400-900°C not more than 20°C/h. Intermediate high-temperature processing is carried out at 1750-2200°C and the heating mode of the workpieces in the range of 800-2200°C not more than 100°C/h and the content of the coke matrix in the workpieces based on the medium-temperature pitch at least 40%. Products are compacted with pitch containing no more than 40% α₁-fraction until porosity of no more than 10% is reached. The final heat treatment is carried out at a temperature not less than 50°C less than the temperature of intermediate high-temperature processing when heating the workpieces in the range of 800-1700°C no more than 100°C/h, and in the range 1700-2150°C - no more than 50 °C/h.

EFFECT: invention improves physical and mechanical characteristics of CCCM, prevents structural changes in the reinforcing component at the finishing stages of manufacturing, leading to decreased strength properties of the material.

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