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

1978-03-09

1979-09-04

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

106 732, 264 65, 264 66, 264332, C04B 3550

Patent

active

041668316

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 six 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: 3588573 (1971-06-01), Chen et al.
Evons, An Introduction to Crystal Chemistry, pp. 38, 39 (1966).

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