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US 11,945,025 B1Granted
Method of wall control in multi-wall investment casting
AssigneeRtx Corporation
InventorsRyan C. Breneman, Markian Stephan Blazejowskyj, Blake Matthew Wilmore
Life of this patent
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Abstract
A casting method includes passing a metallic spacer through respective apertures in at least two ceramic cores to an installed condition wherein the spacer defines a minimum local separation between the at least two cores. The spacer has a shank and at least one arm extending from the shank. A sacrificial pattern material is molded over the metallic spacer and the at least two ceramic cores and then shelled and fired. An alloy is cast in the shell the shell is removed from the cast alloy.
Claims22
A casting method comprising:
- passing a metallic spacer through respective apertures in at least two ceramic cores, the spacer having a shank and at least one arm extending from the shank to an installed condition wherein the spacer defines a minimum local separation between the at least two cores;
- molding a sacrificial pattern material over the metallic spacer and the at least two ceramic cores;
- shelling the sacrificial pattern material;
- firing a shell formed by the shelling;
- casting alloy in the shell;
- and
- removing the shell from the cast alloy.
4 more elements
A casting method comprising:
- providing a metallic spacer between two ceramic cores;
- molding a sacrificial pattern material over the metallic spacer and two ceramic cores;
- shelling the sacrificial pattern material;
- firing a shell formed by the shelling;
- heating the shell to a casting temperature during which the metallic spacer melts;
- after the metallic spacer melts, pouring a casting alloy into the shell;
- and
- removing the shell from the cast alloy, wherein:
- the heating of the shell transforms amorphous silica in the two ceramic cores to cristobalite;
- and
- the spacer melts after at least 50% of said amorphous silica in the two ceramic cores have transformed to cristobalite.
8 more elements
Dependencies are inferred from the claim text.