Transparent yttria ceramics and method for producing same

Details Transparent yttria ceramics and method for producing same Transparent yttria ceramics and method for producing same

1977-07-11

1978-07-04

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C04B 3550

Patent

active

040986128

ABSTRACT:
An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 0.01 to 5 wt. % alumina.
A method for preparing the transparent yttria doped with alumina is also provided comprising admixing alumina or a precursor thereof with yttria or a precursor thereof, drying the admixed powders, calcining the admixed powders and pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for about 1/4 to 6 hours at a temperature above the eutectic temperature at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.

REFERENCES:
patent: 3545987 (1970-12-01), Anderson
patent: 3719550 (1973-03-01), Arendt
patent: 3764643 (1973-10-01), Muta et al.
patent: 3897358 (1975-07-01), Greskovich et al.

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