CRUCIBLE AND EXTRINSIC FACECOAT COMPOSITIONS AND METHODS FOR MELTING TITANIUM AND TITANIUM ALUMINIDE ALLOYS

摘要

Crucible compositions and methods of using the crucible compositions to melt titanium and titanium alloys. More specifically, crucible compositions having extrinsic facecoats comprising a rare earth oxide that are effective for melting titanium and titanium alloys for use in casting titanium-containing articles. Further embodiments are titanium-containing articles made from the titanium and titanium alloys melted in the crucible compositions. Another embodiment is a crucible curing device and methods of use thereof.

主权项

1. A method for forming a crucible for melting titanium and titanium alloys useful in making a titanium-containing article, said method comprising:
combining calcium aluminate with a liquid to produce a first slurry, wherein the percentage of solids in the first slurry is within the range of about 60% to about 80% and the viscosity of the first slurry is within the range of about 50 centipoise to about 150 centipoise; adding large-scale oxide particles greater than 50 microns in size into the first slurry to form a second slurry, wherein the percentage of solids in the second slurry is within the range of about 65% to about 90%; introducing the second slurry into a crucible mold cavity with a removable crucible cavity pattern inserted into the crucible mold cavity; and allowing the second slurry to cure in the crucible mold cavity and around the removable crucible cavity pattern to form a crucible for use in melting titanium and titanium alloys with a wall that defines a thickness that does not vary by more than 30 percent throughout the crucible.