METHOD FOR INCREASING PERMEABILITY OF PORES OF GRAPHITE WORKPIECE Russian patent published in 2019 - IPC C22C47/08 B22F3/26 

FIELD: metallurgy.

SUBSTANCE: invention relates to composite materials with porous carcass impregnation having high electrical conductivity, antifriction properties and resistance to aggressive media. Method of producing coal-graphite material involves vacuum degassing of porous coal-graphite billet, its impregnation in impregnation chamber of melt of matrix alloy under effect of excessive pressure due to thermal expansion of lead melt in pressure chamber at heating by 100 °C above the liquidus temperature of the matrix alloy simultaneously with the lead melt, wherein matrix alloy is copper-phosphorous alloy, degassing is carried out before immersing porous workpiece into melt of matrix alloy, and before impregnation porous workpiece is covered with two-layer galvanic coating consisting of internal copper and outer chromium layers.

EFFECT: technical result is improved quality of composite materials by increasing permeability of pores of graphite billet.

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