Hafnia-modified rare-earth metal-based ceramic bodies and...

Details Hafnia-modified rare-earth metal-based ceramic bodies and... Hafnia-modified rare-earth metal-based ceramic bodies and...

2008-01-31

2010-12-07

Lin, Kuang (Department: 1793)

Metal founding

Process

Shaping a forming surface

C164S369000

Reexamination Certificate

active

07845390

ABSTRACT:
Compositions suitable for use as cores and shell molds for casting of reactive metal alloys, and casting processes for producing components from such alloys. The composition contains a sintered particulate material of hafnia and at least one additional metal oxide in amounts to yield a ceramic composition containing up to 70 molar percent of hafnia, wherein the additional metal oxide is a rare-earth oxide, the sintered particulate material contains first and second phases, the first phase is the rare-earth oxide and hafnia in solid solution, the second phase is a compound of the rare-earth oxide and hafnia, and the second phase is less reactive with the reactive metal alloy than the first phase.

REFERENCES:
patent: 6152211 (2000-11-01), Klug et al.
patent: 6345663 (2002-02-01), Klug et al.
patent: 6676381 (2004-01-01), Subramanian et al.
patent: 7296616 (2007-11-01), Bewlay et al.
patent: 2001/0033950 (2001-10-01), Billings
patent: 2007/0181278 (2007-08-01), Bancheri et al.

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