Improving the Efficiency and Quality of the Impregnation of a Porous Carbon–Graphite Material with the Aluminum Melt by Galvanic Modification of Its Surface

The possibility to increase the extent of filling open pores with the aluminum melt during the impregnation of a carbon–graphite material by the deposition of galvanic film coatings on its surface is studied. The following two types of galvanic coatings have been used: a nickel coating and a combined coating comprised of copper and cadmium layers. The coated samples are impregnated using an out-of-autoclave technology in a special-purpose impregnation chamber. The galvanic coatings are shown to facilitate easier penetration of the aluminum melt into pore cavities, providing effective impregnation of a carbon–graphite material with a matrix alloy at low temperatures (<900°C) and pressures (3–5 MPa).