| abstract |
Concepts for fabricating improved cores for investment casting arendescribed. The cores are composite and include refractory metal elementsn(200,202,204,206,208,210,212,214,216) and ceramic elements (120). The refractorynmetal elements are provided to enhance the mechanical properties of the corenand/or to permit the fabrication of cores having shapes and geometries that couldnnot otherwise be achieved. In one embodiment, the entire core may be made ofnrefractory metal components. The cores may be used to investment cast gas turbinensuperalloy components. |