The impregnation of carbon materials with molten metal is achieved by vacuum-pressure-impregnation at temperatures between 1200 and 2000 K. After removing and cooling the impregnated material consists of three phases, the carbonaceous and metallic phase interpenetrating each other and the remaining porosity. In principal, the impregnation with light metals i.e. Mg and its alloys, is carried out under the same technical conditions as described above. The main difference to the conventional metals is the ability of light metal melts to wet carbon and to react chemically with it to form carbides. The chemical reaction between carbon and the light metal results in a better connection of the two different materials via the interfacial layer of carbide. The lower electrical resistivity is also based on this phenomenon. Magnesium impregnated carbon/graphite is a promising material for current collectors in the electrical rail traffic. Demands of the conventional and the high speed rail traffic for reduced wear, high current density, low resistance, low weight and reduced environmental pollution can be met by this composite material.
Light metal impregnated carbon materials
Leichtmetallimprägnierte Kohlenstoffe
2000
2 Seiten, 1 Bild, 2 Tabellen, 1 Quelle
Aufsatz (Konferenz)
Englisch
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