Transparent aluminum oxynitride and method of manufacture

Details Transparent aluminum oxynitride and method of manufacture Transparent aluminum oxynitride and method of manufacture

1984-01-13

1985-05-28

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 12, 264 65, 423266, 423275, 423385, 423631, 501152, 501153, 501904, C04B 3558

Patent

active

045201161

ABSTRACT:
An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with an in-line transmission of at least 20% in this range.
A method of preparing the optically transparent aluminum oxynitride is also provided comprising the steps of forming a green body of substantially homogeneous aluminum oxynitride powder and pressureless sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron and yttrium in elemental or compound form.

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McCauley, J. W. et al., "Phase Relations and Reaction Sintering of Transparent Cubic Aluminum Oxynitride Spinel (ALON)", J. Am. Cer Soc. 62 (9-10), pp. 476-479, Sep.-Oct. 1979.
Lejus, A., Rev. Int. Hautes Temp. Refract 1 (1) 1964, pp. 83-90 and 93-95.

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