Patent ID: 8992824
Filing Date: 2015-03-31
Classification: B28B,F27B,F27D,F27M

Abstract:
1. A crucible for melting titanium and titanium alloys, said crucible comprising: an extrinsic facecoat having a plurality of extrinsic facecoat layers including a primary extrinsic facecoat layer comprising a rare earth oxide and at least one secondary extrinsic facecoat layer; a bulk disposed on an outer surface of the at least one secondary extrinsic facecoat layer and comprising a calcium aluminate cement; and a cavity for melting titanium and titanium alloys therein, said cavity being defined by an exposed inner surface of the primary extrinsic facecoat layer, wherein the calcium aluminate cement of the bulk comprises calcium monoaluminate and at least one of calcium dialuminate and mayenite.