US4812301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of titanium nitride, carbide, and carbonitride powders
Assignee: GOVERNMENT OF UNITED STATES INTERIOR THE, Secretary of
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Filing: 1986-04-24
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Granted: 1989-03-14
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Expires: 2006-04-24
Abstract
Abstract A process for producing substantially oxygen-free titanium carbide, nitride or carbonitride in powder form comprises treating a gas phase reaction mixture of titanium halide, desirably TiCl 4 , a reductant vapor, desirably sodium or magnesium, and a reactive gas capable of furnishing carbon, nitrogen or mixtures thereof at the reaction temperature, desirably nitrogen, methane or ammonia, to a temperature in the range from 500° to 1250° C., preferably 800° to 1100° C., whereby the titanium halide is substantially simultaneously reduced and carbided, nitrided or carbonitrided. The process may also be practiced using volatile metal halides of metals such as zironium, hafnium, vanadium, niobium, tantalum and silicon for forming substantially oxygen-free carbides, nitrides or carbonitrides thereof in powder form.
Inventors
- 👤 Charles F. Davidson
- 👤 Monte B. Shirts
- 👤 Donna D. Harbuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/076; C01B21/0763; C01B21/082; C01B21/0828; C01B32/00; C01B32/90; C01B32/914; C01B32/921; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A process for producing substantially oxygen-free titanium carbide consisting essentially of heating a gas phase reaction mixture of titanium halide, a reductant vapor selected from the class consisting of sodium and magnesium and a reactive gas capable of furnishing carbon at a temperature in the range from 500° to 1250° C., whereby the titanium halide is substantially simultaneously reduced and carbided for producing substantially oxygen-free titanium carbide in powder form having a particle size from about 0.1 to about 0.5 microns; said reductant vapor being present in said reaction mixture in an amount of from 75 to 200 percent by weight of the stoichiometric amount needed to reduce the titanium halide, and said reactive gas being present in said reaction mixture in an amount which is one to ten times the stoichiometric amount needed for reaction.
Claim 2
Dependent Claim
136 words
A process for producing substantially oxygen-free titanium carbide consisting essentially of heating a gas phase reaction mixture of titanium halide, a reductant vapor selected from the class consisting of sodium and magnesium and a reactive gas capable of furnishing carbon at a temperature in the range from 500° to 1250° C., whereby the titanium halide is substantially simultaneously reduced and carbided for producing substantially oxygen-free titanium carbide in powder form having a particle size from about 0.1 to about 0.5 microns; said reductant vapor being present in said reaction mixture in an amount of from 75 to 200 percent by weight of the stoichiometric amount needed to reduce the titanium halide, and said reactive gas being present in said reaction mixture in an amount which is one to ten times the stoichiometric amount needed for reaction.
Claim 3
Dependent Claim
25 words
A process, as claimed in claim 1, wherein the gas phase reaction mixture is heated to a temperature in the range 800° to 1100° C.
Claim 4
Dependent Claim
13 words
A process, as claimed in claim 1, wherein said reactive gas is methane.
Claim 5
Dependent Claim
37 words
A process, as claimed in claim 1 wherein said reductant is present in said reaction mixture in an amount which is 110 to 150 percent by weight of the stoichiometric amount needed to reduce the titanium halide.
Claim 6
Dependent Claim
32 words
A process, as claimed in claim 1 wherein said reactive gas is present in said reaction mixture in an amount which is two to four times the stoichiometric amount needed for reaction.
Claim 7
Dependent Claim
75 words
A process, as claimed in claim 1, wherein said titanium halide is TiCl 4 , said reactive gas is methane and said reductant is present in said reaction mixture in an amount which is 75 to 200 percent by weight of the stoichiometric amount needed to reduce the titanium halide and said reactive gas is present in said reaction mixture in an amouned which is one to ten times the stoichiometric amount needed for reaction.
Claim 8
Dependent Claim
23 words
A process, as claimed in claim 1, including the steps of separating the reaction product carbide powder from the reaction product chloride salts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |