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US 9,511,417 B2Granted
Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys
AssigneeGeneral Electric Company
InventorsBernard Patrick Bewlay, Joan McKiever, Brian Michael Ellis, Nicholas Vincent McLasky
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Abstract
The disclosure relates generally to mold compositions and methods of molding and the articles so molded. More specifically, the disclosure relates to silicon carbide-containing mold compositions, silicon carbide-containing intrinsic facecoat compositions, and methods for casting titanium-containing articles, and the titanium-containing articles so molded.
Claims17
A method for forming a mold for casting a titanium-containing article, comprising:
- mixing calcium aluminate and silicon carbide with a liquid to produce a slurry, wherein the percentage of solids in the slurry is about 60% to about 80% by weight of the slurry and a viscosity of the slurry is about 30 to about 1500 centipoise;
- introducing the slurry into a mold cavity that contains a fugitive pattern;
- and
- allowing the slurry to cure in the mold cavity to form the mold for casting the titanium-containing article, wherein a particle size of the calcium aluminate is less than about 50 microns in outside dimension.
1 more element
A method for casting titanium and titanium alloys, comprising:
- obtaining an investment casting mold composition comprising calcium aluminate and large scale aluminum oxide, wherein the calcium aluminate and alumina are combined with a liquid and silicon carbide to produce a final calcium aluminate/liquid mixture slurry, and wherein the solids in the final mixture is about 70% to about 95% by weight of the slurry, wherein a particle size of the calcium aluminate is less than about 50 microns in outside dimension;
- pouring said investment casting mold composition into a vessel containing a fugitive pattern;
- curing said investment casting mold composition;
- removing said fugitive pattern from the mold;
- firing the mold;
- preheating the mold to a mold casting temperature;
- pouring molten titanium or titanium alloy into the heated mold;
- solidifying the molten titanium or titanium alloy;
- forming a solidified titanium or titanium alloy casting;
- and
- removing the solidified titanium or titanium alloy casting from the mold.
8 more elements
Dependencies are inferred from the claim text.