METHOD FOR INCREASING PERMEABILITY OF PORES OF A 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 wear resistance, antifriction properties and resistance to aggressive media. Method of producing coal-graphite composite material includes vacuum degassing of porous coal-graphite billet, its impregnation with molten matrix lead alloy under the effect of excessive pressure due to thermal expansion of the melt when heated above the liquidus temperature of the lead alloy, wherein degassing is carried out prior to submersion of porous workpiece into melt of matrix alloy, and before impregnation porous workpiece is coated with two-layer galvanic coating consisting of internal copper and outer nickel layers.

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

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