Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1978-03-31
1979-04-03
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 65, 264 66, C04B 3550
Patent
active
041477448
ABSTRACT:
An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 6 to 14 mole percent lanthana.
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 temperature 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.
REFERENCES:
patent: 3792142 (1974-02-01), Kobayashi
patent: 3878280 (1975-04-01), Datta
Borokova et al., "The Sintering and Properties of Yttrium Oxide Ceramics," Ogneupory, vol. 35, No. 11, 1970 pp. 39-45.
Brissette, et al., "Thermomechanically Deformed Y.sub.2 O.sub.3 " J. Am. Cer. Soc., vol. 49, No. 3, pp. 165-166.
Curtis, "Properties of Yttrium Oxide Ceramics," J. Am. Cer. Soc., vol. 40, No. 8, pp. 274-278, Aug. 1957.
Furlong et al., "Sintering of Yttrium Oxide," Cer. Bull., vol. 45, No. 12 (1966).
GTE Laboratories Incorporated
Keay David M.
Porrish John A.
White Robert F.
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