Metal nitride powders
AssigneeUnited Technologies Corporation
InventorsYouming Xiao, Benj J. Tan, Steven L. Suib, Francis S. Galasso
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Abstract
A metal nitride powder can be made by heating a reactant powder that includes an oxide or hydroxide of Al, Ti, or Zr to a reaction temperature in a nonreactive atmosphere. The heated reactant powder is contacted with a gaseous reactant mixture comprising a nitrogen source and a carbon source. The molar ratio of nitrogen to carbon in the gaseous reactant mixture is at least about 15. The reactant powder is maintained at the reaction temperature for a sufficient time to convert a portion of it to metal nitride powder.
Claims3
AlN powder made by:
- (a) heating a reactant powder comprising an aluminum oxide or an aluminum hydroxide to reaction temperature greater than 1000.degree. C. in a nonreactive atmosphere,
- (b) contacting the heated reactant powder with a gaseous reactant mixture comprising a nitrogen source and a carbon source, wherein the gaseous reactant mixture has a molar ratio of nitrogen to carbon of at least about 15, and
- (c) maintaining the reactant powder at the reaction temperature for a sufficient time to convert the reactant powder completely to AlN powder,
- wherein the AlN powder is substantially carbon-free and oxygen-free.
TiN powder made by:
- (a) heating a reactant powder comprising a titanium oxide or a titanium hydroxide to a reaction temperature greater than about 800.degree. C. in a nonreactive atmosphere,
- (b) contacting the heated reactant powder with a gaseous reactant mixture comprising a nitrogen source and a carbon source, wherein the gaseous reactant mixture has a molar ratio of nitrogen to carbon of at least about 15, and
- (c) maintaining the reactant powder at the reaction temperature for a sufficient time to convert the reactant powder completely to TiN powder,
- wherein the TiN powder is substantially carbon-free and oxygen-free.
ZrN powder made by;
- (a) heating a reactant powder comprising a zirconium oxide or a zirconium hydroxide to a reaction temperature greater than about 1100.degree. C. in a nonreactive atmosphere,
- (b) contacting the heated reactant powder with a gaseous reactant mixture comprising a nitrogen source and a carbon source, wherein the gaseous reactant mixture has a the molar ratio of nitrogen to carbon of at least about 15, and
- (c) maintaining the reactant powder at the reaction temperature for a sufficient time to convert the reactant powder completely to ZrN powder
- wherein the ZrN powder is substantially carbon-free and oxygen-free.
Dependencies are inferred from the claim text.