C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1
C04B 35/50 (2006.01) C04B 35/505 (2006.01)
Patent
CA 1090376
TRANSPARENT YTTRIA CERAMICS AND METHOD FOR PRODUCING SAME ABSTRACT OF THE DISCLOSURE A ceramic article of manufacture having application where transparency and resistance to high temperatures is re- quired, as for example in high temperature lamp envelopes, is provided comprising a substantially transparent high densi- ty polycrystalline yttria-based body consisting essentially of yttria and from about 6 to 14 mole percent lathana. A method for preparing the transparent yttria doped with lanthana is also provided comprising admixing or co- precipitating lanthana or a precursor thereof with yttria or a precursor thereof, washing, drying and screening the mixture, calcining the admixed or co-precipitated powders, pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for from about 1/6 to 6 hours at a tempera- ture above the H-phase transition and for from about 1/2 to 6 hours at a temperature below the H to C phase transition, said sintering being effected at a sufficiently low oxygen atmosphere to prevent oxidative contaminants. -1-
306721
Gte Laboratories Incorporated
R. William Wray & Associates
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