Crucible for melting rare earth element alloy and rare earth...

Details Crucible for melting rare earth element alloy and rare earth... Crucible for melting rare earth element alloy and rare earth...

2007-01-02

2007-01-02

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C501S152000, C501S127000, C148S302000, C266S280000

Reexamination Certificate

active

10495452

ABSTRACT:
A crucible comprising Al2O3and at least one selected from rare earth oxides inclusive of Y2O3as main components and characterized by firing at 500–1,800° C., the distribution of the rare earth oxide at a higher proportion in a fine particle portion having a particle size of up to 0.5 mm than in a coarse particle portion having a particle size in excess of 0.5 mm, and the substantial absence of the reaction product of the rare earth oxide with Al2O3is suitable for the melting of a rare earth alloy.

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