Optically translucent ceramic

Details Optically translucent ceramic Optically translucent ceramic

1982-05-25

1984-01-24

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 12, 264 65, 264325, 264332, 423327, 501 12, 501153, 501154, 501900, C04B 3518

Patent

active

044277857

ABSTRACT:
Optically translucent theoretically dense body of mullite is produced by pressing an amorphous mixed oxide powder composition of from about 72.5 weight % to about 76.5 weight % Al.sub.2 O.sub.3 /balance SiO.sub.2 into a compact of density of at least 1.0 g/cc, sintering the compact in oxygen or a vacuum of 0.05 torr to 1 torr producing a gas-impermeable compact, hot isostatically pressing the gas-impermeable compact to theoretical density, and with respect to compositions ranging from higher than about 74 wt % Al.sub.2 O.sub.3 /balance SiO.sub.2, annealing the theoretically dense body.

REFERENCES:
patent: 3922333 (1975-11-01), Mazdiyasni et al.
patent: 3989783 (1976-11-01), McGee et al.
patent: 4101615 (1978-07-01), Horikiri et al.
patent: 4266978 (1981-05-01), Prochazka
patent: 4381931 (1983-05-01), Hunold et al.
B. E. Yoldas, "Microstructure of Monolithic Materials Formed by Heat Treatment of Chemically Polymerized Precursors in the Al.sub.2 O.sub.3 -SiO.sub.2 Binary", vol. 59, No. 4, pp. 479-483 (1980).
"Advanced Optical Ceramics, Phase II", Book 1 of 2, ONR Contract No. N00014-78-C-0466 (DIN: 80SDR2172) General Electric Co., pp. 1-14 and 21-42 (Aug. 31, 1980).
"Program Review-Advanced Optical Ceramics-Phase II, Government/Industry Briefing" ONR Contract No. N00014-78-C-0466, DARPA Order No. 3387 General Electric Company, P. C-9, (May 8-9, 1980).
K. S. Mazdiyasni & L. M. Brown, "Synthesis and Mechanical Properties of Stoichiometric Aluminum Silicate (Mullite)", vol. 55, No. 11, pp. 548-552, (Nov. 1972).
Levin, E. M. et al., Phase Diagrams for Ceramists-1975 Suppl. Ed. & Pub. by The American Ceramic Soc., Inc. (1975)-FIGS. 4373-74.

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