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 composite material involves vacuum degassing of porous coal-graphite billet, its impregnation with melt of aluminium alloy matrix under action of excessive pressure due to thermal expansion of melt at heating above liquidus temperature of aluminium 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 three-layer galvanic coating consisting of inner copper, medium nickel and outer chromium layers.

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

1 cl, 2 dwg, 1 tbl, 1 ex