Molding material mixture and feeder for casting aluminum

Abstract

The invention relates to an exothermic molding material mixture for producing feeders for casting aluminum, comprising at least: - a fireproof base molding material; - a binder; - a proportion of an oxidizable metal of from 5 to 18% by weight relative to the molding material mixture; - an oxidizing agent at a proportion of 10 to 50% by weight relative to the quantity of oxidizing agent required for completely oxidizing the oxidizable metal; and - an igniter for oxidizing the oxidizable metal at a proportion of 15 to 50% by weight relative to the quantity of the oxidizable metal. A feeder made of the exothermic molding material mixture ignites reliably, even at low temperatures, and is characterized by low heat emission. It is therefore particularly suitable for casting aluminum.

Dependencies are inferred from the claim text.