Whisker-reinforced ceramic containing aluminum oxynitride and method of making the same
AssigneeKennametal Inc.
InventorsRusseli Yeckley, Shanghua Wu
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Abstract
A process of making aluminum oxynitride powder including the steps of: forming a powder mixture by mixing alumina powder and aluminum nitride powder according to the following formula: ((4−x)/3) alumina and x aluminum nitride wherein x is in mole percent and ranges between about 0.31 and about 0.61; adding between about 0.1 mole percent and about 1.0 mole percent of pure aluminum powder to the powder mixture; and reacting the powder mixture containing aluminum at a temperature between about 1600° C. and about 1900° C. for a duration between about 2 hours and about 24 hours in a flowing nitrogen atmosphere so as to form aluminum oxynitride.
Claims4
A process of making aluminum oxynitride powder comprising the steps of:
- forming a powder mixture by mixing alumina powder and aluminum nitride powder according to the following formula:
- ((4−x)/3) alumina and x aluminum nitride wherein x is in mole percent and ranges between about 0.31 and about 0.61;
- adding between about 0.1 mole percent and about 1.0 mole percent of pure aluminum powder to the powder mixture;
- and
- reacting the powder mixture containing aluminum at a temperature between about 1600° C. and about 1900° C. for a duration between about 2 hours and about 24 hours in a flowing nitrogen atmosphere so as to form aluminum oxynitride.
Dependencies are inferred from the claim text.