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US 4,703,806 AGranted
Ceramic shell mold facecoat and core coating systems for investment casting of reactive metals
AssigneeHowmet Turbine Components Corporation
InventorsEliot S. Lassow, Paul R. Johnson, Sidney R. Whitaker, Manuel Guerra, Jr.
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Abstract
An yttria-based slurry comprising a dense grain yttria powder and a non-aqueous-based binder is used as a mold facecoat and corecoat for investment casting of reactive metals such as titanium and titanium alloys.
Claims24
A method of fabricating molds for casting reactive metals comprising the steps of:
- preparing an yttria-based slurry comprising a dense grain yttria powder having a density greater than 4.60 gm/cc and a non-aqueous-based binder;
- and using said slurry as a mold facecoat or corecoat in the fabrication of a mold for casting a reactive metal.
A method of making a casting shell for fabricating a reactive metal casting comprising the steps of:
- preparing a pattern;
- dipping said pattern in an yttria-based slurry comprising a dense grain yttria powder having a density greater than 4.60 gm/cc and a non-aqueous-based binder;
- forming a shell on said dipped pattern;
- drying said shell;
- removing said pattern;
- and
- firing said shell.
4 more elements
A method of making a casting core for fabricating a reactive metal casting comprises the steps of:
- forming a removable ceramic core;
- coating said core with an yttria-based slurry comprising a dense grain yttria powder having a density greater than 4.60 gm/cc and a non-aqueous-based binder;
- and
- firing said coated core.
1 more element
Dependencies are inferred from the claim text.