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

C - Chemistry, Metallurgy

03

C

261/1

C03C 1/00 (2006.01) C03C 3/12 (2006.01) C04B 35/505 (2006.01) H01J 5/04 (2006.01)

Patent

CA 1101893

TRANSPARENT YTTRIA CERAMICS AND METHOD FOR PRODUCING SAME ABSTRACT OF THE DISCLOSURE An article of manufacture having Application where transparency and resistance to high temperature are required as, for exmaple, in high temperature lamp envelopes 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 press- ing 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. -1-

306720

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