Refractory metal core coatings

Details Refractory metal core coatings Refractory metal core coatings

2003-10-15

2009-08-18

Kerns, Kevin P (Department: 1793)

Metal founding

Means to shape metallic material

United particle type shaping surface

Reexamination Certificate

active

07575039

ABSTRACT:
A refractory metal core for use in a casting system has a coating for providing oxidation resistance during shell fire and protection against reaction/dissolution during casting. In a first embodiment, the coating includes at least one oxide and a silicon containing material. In a second embodiment, the coating includes an oxide selected from the group of calcia, magnesia, alumina, zirconia, chromia, yttria, silica, hafnia, and mixtures thereof. In a third embodiment, the coating includes a nitride selected from the group of silicon nitride, sialon, titanium nitride, and mixtures thereof. Other coating embodiments are described in the disclosure.

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