Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform
Patent
1981-01-27
1982-12-21
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Optical fiber, waveguide, or preform
264 63, 264 65, 264 66, C04B 3544
Patent
active
043648770
ABSTRACT:
A process for producing fritted alumina members having a high optical transparency and a high mechanical strength of the type involving the production of the members from a high purity alumina powder to which has been added an organic binder and a small percentage of oxide, particularly of magnesium and/or rare earth, followed by the shaping thereof and subjecting them to two successive heat treatments, namely a first treatment in an oxidizing atmosphere to remove the binder and consolidate the particles and a second treatment at a higher temperature and in a hydrogen-rich atmosphere for obtaining fritting, wherein the second heat treatment takes place by continuously passing the said members through a kiln kept at a temperature between 1820.degree. and 1970.degree. C. at a constant translation speed between 3 and 50 millimeters per minute, the total time necessary for firing a member from the consolidated or slightly warm state up till its return to ambient temperature varying from approximately 30 minutes to a maximum of 5 hours.
REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 3206177 (1962-03-01), St. Pierre
patent: 3875277 (1975-04-01), Bratton
Harmer et al., "Rapid Sintering of Pure and Doped .alpha.-Al.sub.2 O.sub.3 ", Trans. Brit. Cer. Soc., vol. 78, No. 1, 1979, pp. 22-25.
G. C. Kuczynski, "Sintering and Related Phenomena", Materials Science Research, No. 6, 1973, p. 217.
J. G. J. Pee Len, "Transparent Hot Pressed Alumina", Ceramurgia International, vol. 5, No. 3, 1979, pp. 70-73.
Clement Rene
Gugliermotte Francis
Parrish John A.
Societe Europeenne des Ceramiques A lumineuses "EUROCERAL"
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