MULTI-WALL CORE AND PROCESS

摘要

Method for making a multi-wall ceramic core for use in casting airfoils, such as turbine blades and vans, wherein a fugitive pattern (20) having multiple thin wall pattern elements (P1), (P2), (P3) corresponding to internal wall-forming spaces of a final core is formed, the pattern is placed in a core molding die cavity (30) having a desired core configuration, a fluid ceramic material is introduced into the die cavity about the pattern and between the pattern elements to form a ceramic core (10), and the core is removed from the die cavity. The fugitive pattern is selectively removed from the core to provide a multi-wall green core. The green core then is fired to develop core strength for casting and used to form an investment mold (M) for casting an airfoil.