Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-01-13
1984-11-06
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Refractory
264 12, 264 65, 423266, 423275, 423385, 423630, 501152, 501153, 501904, C04B 3558
Patent
active
044813007
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.
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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), 1979, pp. 476-479.
Lejus, A.-Rev. Int. Hautes Temp. Reract 1(1), 1964, pp. 83-90 and 93-95.
Gentilman Richard L.
Hartnett Thomas M.
Maguire Edward A.
Maloney Denis G.
McCarthy Helen M.
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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