Rare earth-based core constructions for casting refractory...

Details Rare earth-based core constructions for casting refractory... Rare earth-based core constructions for casting refractory...

2006-09-29

2009-11-03

Kerns, Kevin P (Department: 1793)

Metal founding

Process

Shaping a forming surface

C164S519000, C164S529000, C164S369000

Reexamination Certificate

active

07610945

ABSTRACT:
A method of fabricating a core for a ceramic shell mold is disclosed. A porous core body is formed from at least about 50% by weight of at least one rare earth metal oxide. The core body is heated under heating conditions sufficient to provide the core with a density of about 35% to about 80% of its theoretical density. The core body is then infiltrated with a liquid colloid or solution of at least one metal oxide compound, e.g., rare earth metal oxides; silica, aluminum oxide, transition metal oxides, and combinations thereof. The infiltrated core body is then heated to sinter the particles without substantially changing the dimensions of the core body. Mold-core assemblies which include such a core body are also described. A description of processes for casting a turbine component, using the core, is also set forth herein.

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