METHOD FOR PRODUCING CARBON-GRAPHITE COMPOSITE MATERIAL Russian patent published in 2021 - IPC B22F3/26 C22C1/08 

FIELD: metallurgy, composite materials in particular.

SUBSTANCE: invention relates to the field of metallurgy, namely, to a method for producing a carbon-graphite composite material with high electrical conductivity, anti-friction properties, and resistance in aggressive environments. The method for producing a carbon-graphite composite material includes vacuum degassing of a porous carbon-graphite billet in a copper electrolyte solution, coating the billet with a two-layer electroplated coating, including an inner copper layer, placing the carbon-graphite billet with an electroplated coating in the impregnation chamber, and impregnating the matrix copper-phosphorous alloy with a melt under the influence of excessive pressure due to thermal expansion of the lead melt in the pressure chamber when heated at 100°C above the liquidus temperature of the matrix alloy simultaneously with the lead melt. The outer layer of the electroplated coating is made of a tin-bismuth layer consisting of, weight percentage: 99 tin and 1 bismuth deposited by electrolysis from an electrolyte containing 35 g/l of tin sulfate, 1.5 g/l of bismuth sulfate, 170-180 g/l of sulfuric acid, 5-6 ml/l of formalin. The carbon graphite billet is placed in the impregnation chamber at the temperature of the lead melt in the pressure chamber at 5-10°С lower than the temperature liquidus of the lead alloy.

EFFECT: dividing the technology into simpler stages, reducing the impregnation temperature, improving the wetting of the carbon-graphite frame, increasing the permeability of its pores and, accordingly, improving the quality of composite materials.

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