Graphite body impregnated with a light metal - alloy, a method for its production and its use

摘要

The present invention relates to a with a light metal - alloy impregnated graphite body, of the 10 to 20 vol.% of an aluminum - alloy with a content of 5 to 9,9 mass% silicon, 0,05 to 5,0 mass% copper, 0,5 to 1,5 mass% iron, 0,25 to 1,0 mass% manganese, 0,10 to 1,5 mass% zinc and 0,05 to 0,35 mass% titanium in a matrix made of graphite particles with a mean particle size in the range from 3 to 20 µm and a density of 2,00 to 2,3 g / cm³, a flexural strength of 120 to 160 n / mm.², a compressive strength of from 250 to 330 n / mm.² a modulus of elasticity of 10,0 x 10³ to 40 × 10³ N / mm.³ as well as a thermal conductivity of 70 to 140 w / mk has. The present invention also relates to a process for the production of such a graphite body and its use as electrode for the discharge machining of metal parts.