Patent ID: 8393381
Filing Date: 2013-03-12
Classification: B22C,B22D,B33Y

Abstract:
1. A method of forming a metal cast article, said method comprising the steps of forming a ceramic core containing a cavity by interconnecting layers of ceramic material to form the cavity with dimensions which are greater than a thickness of a plurality of said layers, positioning the core in a mold, at least partially filling a cavity in the mold with molten metal while maintaining the cavity in the core at least substantially free of molten metal, solidifying the molten metal in the mold to form a cast metal article which at least partially contains the core, and removing the core from the cast metal article, said step of removing the core from the cast metal article includes at least partially filling the cavity in the core with a leaching liquid while the core is at least partially disposed in the cast metal article and engaging the layers of ceramic material with the leaching liquid filling the cavity in the core.