Method of producing aluminum oxynitride having improved optical

Details Method of producing aluminum oxynitride having improved optical Method of producing aluminum oxynitride having improved optical

1984-10-29

1987-08-11

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264 65, 423266, 423275, 423385, 423630, 501 98, 501152, 501153, 501904, C04B 3558

Patent

active

046860703

ABSTRACT:
A method of preparing substantially homogeneous aluminum oxynitride powder is provided comprising the steps of reacting gamma aluminum oxide with carbon in the presence of nitrogen, and breaking down the resulting powder into particles in a predetermined size range. A method of preparing a durable optically transparent body from this powder is also provided comprising the steps of forming a green body of substantially homogeneous cubic aluminum oxynitride powder and sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron, in elemental or compound form, and at least one additional element selected from the group of yttrium and lanthanum or compounds thereof. The sintered polycrystalline cubic aluminum oxynitride has a density greater than 99% of theoretical density, an in-line transmission of at least 50% in the 0.3-5 micron range, and a resolving angle of 1 mrad or less.

REFERENCES:
patent: 3711585 (1973-01-01), Murta
patent: 3718490 (1973-02-01), Morgan et al.
patent: 4182972 (1980-01-01), Kaneno et al.
patent: 4241000 (1980-12-01), McCauley et al.
Lejus, A.-Rev. Int. Houtes Temp. Reract 1(1), 1964, pp. 83 and 93-95.
McCauley, J. W. et al., "Phase Relations and Reaction Sintering of Transparent Cubic Aluminum Oxynitride Spinel" (ALON) J. Am Cer. Soc. 62, (9-10), 1979, pp. 476-479.

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