Patent JPS5633869A successfully refreshed from Google Patents.
Patent US1070800A successfully refreshed from Google Patents.
Patent US2176532A successfully refreshed from Google Patents.
Patent US5417823A successfully refreshed from Google Patents.
US5417823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-nitrides prepared by photolytic/pyrolytic decomposition of metal-amides
Assignee: MID-AMERICA COMMERICIALIZATION CORP
•
Filing: 1993-12-17
•
Granted: 1995-05-23
•
Expires: 2013-12-17
Abstract
Abstract This invention is directed to a method for preparing materials comprising metal nitrides by the photolytic/pyrolytic decomposition of metal amides. The metal amides may be zirconium and/or niobium amides, which may additionally contain titanium amides.
Inventors
- 👤 Chaitanya K. Narula
- 👤 Michel M. Maricq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:31
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/0615; C01B21/0617; C01B21/076; C01B21/0766; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/34; C23C16/44; C23C16/48; C23C16/483; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A method of preparing materials comprising metal nitrides by photolytic/pyrolytic decomposition of metal amides, which method comprises: providing metal amides selected from the group consisting of (a) Zr[R 2 N] 4 ; (b) Nb[R 2 N] 4 ; (c) mixtures of (a) and (b); and (d) mixtures of any of (a), (b), or (c) with Ti[R 2 N] 4 ; wherein R is an organic group; irradiating said metal amides to decompose at least a portion of said metal amides to an metal-organic residue; removing undecomposed metal amides from said metal-organic residue; and pyrolyzing said metal-organic residue in an inert or ammonia atmosphere at an elevated temperature to form a material comprising metal nitrides selected from the group consisting of (a) ZrN; (b) Nb 4 N 3 ; (c) mixtures of (a) and (b); and (d) mixtures of any of (a), (b), or (c) with TiN.
Claim 2
Independent Claim
146 words
A method of preparing materials comprising metal nitrides by photolytic/pyrolytic decomposition of metal amides, which method comprises: providing metal amides selected from the group consisting of (a) Zr[R 2 N] 4 ; (b) Nb[R 2 N] 4 ; (c) mixtures of (a) and (b); and (d) mixtures of any of (a), (b), or (c) with Ti[R 2 N] 4 ; wherein R is an organic group; irradiating said metal amides to decompose at least a portion of said metal amides to an metal-organic residue; removing undecomposed metal amides from said metal-organic residue; and pyrolyzing said metal-organic residue in an inert or ammonia atmosphere at an elevated temperature to form a material comprising metal nitrides selected from the group consisting of (a) ZrN; (b) Nb 4 N 3 ; (c) mixtures of (a) and (b); and (d) mixtures of any of (a), (b), or (c) with TiN.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein said metal amides are provided deposited on a substrate comprising refractory material.
Claim 4
Dependent Claim
13 words
The method according to claim 2, wherein said substrate is in particulate form.
Claim 5
Dependent Claim
26 words
The method according to claim 2, wherein said refractory material is selected from the group consisting of magnesium oxide, aluminum oxide, silicon nitride, and titanium oxide.
Claim 6
Dependent Claim
29 words
The method according to claim 1, wherein during said irradiating step said metal amides are provided in a gas phase, liquid phase, or dissolved in an inert organic solvent.
Claim 7
Dependent Claim
23 words
The method according to claim 1, wherein said atmosphere comprises gases selected from the group consisting of nitrogen, argon, ammonia and mixtures thereof.
Claim 8
Dependent Claim
20 words
The method according to claim 6, wherein said inert atmosphere comprises nitrogen and said pyrolyzing temperature is about 600° C.
Claim 9
Dependent Claim
20 words
The method according to claim 6, wherein said atmosphere comprises an ammonia and said pyrolyzing temperature is above 1000° C.
References Cited (Backward Citations)
US4395436A
Cited
US4636403A
Cited
US4952556A
Cited
US4925830A
Cited
US4916115A
Cited
US5183684A
Cited
US5100693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-22 | 1998-11-21 | 1999-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-22 | 2002-11-21 | 2003-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-22 | 2006-11-21 | 2007-05-23 | $7700.00 | Window Closed / Lapsed |