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 creation of composite materials with impregnation of porous frame, having high wear resistance, antifriction properties, resistance in aggressive media. Method of producing coal-graphite composite material involves vacuum degassing of porous coal-graphite billet, its impregnation with molten matrix lead alloy under effect of excess pressure due to thermal expansion of the melt when heated above the liquidus temperature of the lead alloy, wherein the degassing is carried out before immersing the porous workpiece into the melt of the 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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