Compositions: ceramic – Ceramic compositions – Refractory
Patent
1990-08-09
1993-07-27
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 98, 501119, 501153, 106 35, 433 8, C04B 3558
Patent
active
052310620
ABSTRACT:
This invention provides a transparent aluminum magnesium oxynitride ceramic, wherein greater than 0.5 weight percent of the total ceramic composition is magnesium oxide. The ceramic article of the present invention is useful in applications where it is desirable to have a transparent ceramic including, for example, in orthodontic brackets, ferrules, and gas tight envelopes.
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"Phase Relationship in the System Mg-Al-O-N", Chinese Sci. Bull., 35, (14), Jul., 1990, pp. 1189-1192, Sun et al.
"A Simple Model for Aluminum Oxynitride Spinels", J. Am. Ceram. Soc., 61, (708), 1978, pp. 372-373.
"Study on the Reductive Spinel-A New Formula AlN-Al.sub.2 O.sub.3 Instead of the Previous One Al.sub.2 O.sub.4 " Bull. Chem. Soc. Jap., 32, (11); Nov. 1959, pp. 1264-1265.
"On the Formation of High Temperature Nonstoichiometric Spinels and Derivative Phases, In Several Oxide Systems Based on Alumina and in the System Aluminum Nitride Alumina," Rev., Hautes, Temper. et Refract., Ch. 5, 1, 1964, pp. 58-95.
"The System Al-Mg-O-N", J. Am. Ceram. Soc., 65, (5-6), 1982, pp. C-68-69.
Frey Robert G.
Mathers James P.
Griswold Gary L.
Group Karl
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sherman Lorraine R.
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