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US 5,350,719 AGranted
Preparation of titanium nitride-containing refractory material composites
AssigneeFord Motor Company
InventorsChaitanya K. Narula, Gary M. Crosbie
Life of this patent
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Abstract
A titanium tetrahalide is reacted with a disilazane to prepare a titanium containing organometallic precursor, which is thereafter mixed with a refractory material powder and pyrolyzed to form a titanium nitride-containing refractory material composite containing crystalline titanium nitride.
Claims14
A process for preparing a titanium nitride-containing refractory material solid composite, comprising the steps of:
- A) contacting a titanium tetrahalide with a disilazane at a temperature and for a period of time sufficient to prepare a titanium-containing organometallic precursor;
- B) mixing the titanium-containing organometallic precursor with a refractory material powder, the weight ratio of titanium-containing organometallic precursor to refractory material powder being from about 1:50 to about 1:1;
- C) heating the mixture of titanium-containing organometallic precursor and refractory material powder in an inert atmosphere to a temperature of at least about 600.degree. C. and for a period of time sufficient to pyrolyze the precursors;
- and
- D) further heating the pyrolyzed mixture at a temperature of at least about 1,600.degree. C. to densify the pyrolyzed mixture to a solid composite.
2 more elements
A process for preparing a titanium nitride-containing refractory material composite, comprising the steps of:
- A) contacting a titanium tetrahalide with a disilazane, the mole ratio of titanium tetrahalide to disilazane being from about 1:0.5 to about 1:3, optionally in the presence of a solvent, at a temperature from about -100.degree. C. to about 100.degree. C. and for a period of time sufficient to prepare a titanium-containing organometallic precursor;
- B) mixing the titanium-containing organometallic precursor with a refractory material powder, the weight ratio of titanium-containing organometallic precursor to refractory material powder being from about 1:50 to about 1:1;
- C) heating the mixture of titanium-containing organometallic precursor and refractory material powder in an inert atmosphere to a temperature of at least about 600.degree. C. for a period of time sufficient to pyrolyze the precursor;
- and
- D) further heating the pyrolyzed mixture at a temperature of at least about 1,600.degree. C. to densify the pyrolyzed mixture to a solid composite.
2 more elements
A process for preparing a Si.sub.3 N.sub.4 --TiN composite, comprising the steps of:
- A) contacting titanium tetrachloride with hexamethyldisilazane, the mole ration of titanium tetrahalide to hexamethyldisilazane being from about 1:1 to about 1:2, optionally in the presence of a solvent, at a temperature from about -100.degree. C. to about 100.degree. C. and for a period of time sufficient to prepare a titanium-containing organometallic precursor;
- B) mixing the titanium-containing organometallic precursor with Si.sub.3 N.sub.4. the weight ratio of titanium-containing organometallic precursor to Si.sub.3 N.sub.4 being from about 1:50 to about 1:1;
- C) heating the mixture of titanium-containing organometallic precursor and Si.sub.3 N.sub.4 in an inert atmosphere to a temperature of at least 600.degree. C. for a period of time sufficient to pyrolyze the precursor;
- and
- D) further heating the pyrolyzed mixture at a temperature of at least about 1,600.degree. C. to densify the pyrolyzed mixture to a solid composite.
2 more elements
Dependencies are inferred from the claim text.