US4789534A
Expired / Lapsed
US
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Transition metal carbides and process for making same
Assignee: SRI International Inc
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Filing: 1987-11-06
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Granted: 1988-12-06
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Expires: 2007-11-06
Abstract
Abstract Transition metal carbides in which the carbon is in excess and is covalently bound to the metal are produced by pyrolyzing transition metal amides that have two or more metal atomos, such as hexakis(dimethylamido) ditungsten or dimolybdenum.
Inventors
- 👤 Richard M. Laine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5626; B; B22; B22F; B22F3/00; B22F3/001; B82; B82Y; B82Y30/00; C01; C01B; C01B21/00; C01B21/06; C01B21/0615; C01B21/0635; C01B25/00; C01B25/08; C01B32/00; C01B32/90; C01B32/907; C01B32/914; C01B32/921; C01B32/928; C01B32/949; C01B33/00; C01B33/06; C01B35/00; C01B35/02; C01B35/04; C04B35/622; C04B35/62227; C04B35/626; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5133; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C22; C22B; C22B25/00; C22B25/02; C22B5/00; C22B5/02; C22B5/20; C22B59/00; C22B60/00; C22B60/02; C22B60/0204; C22B60/0213; C22B60/0291; C22B60/0295; C22B60/04; C22C; C22C1/00; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/125; C23C18/1275; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/80; C01P2002/82; C01P2002/85; C01P2004/00; C01P2004/01; C01P2004/04; C01P2004/10; C01P2004/54; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/42; C01P2006/80; C01P2006/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
A process for making a transition metal carbide comprising pyrolyzing a tractable transition metal amide of the formula M.sub.x (NR.sup.1 R.sup.2).sub.y where M is a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir, Pt, and all elements from atomic number 89 on, x is an integer and is equal to or greater than 2, R 1 and R 2 are the same or different and are hydrogen, lower alkyl, trimethylsilyl, or ethylene, with the proviso that both R 1 and R 2 are not hydrogen, and y is an integer equal to the valence of the M x unit, under nonoxidizing conditions at a temperature at which a carbon-containing group of the amido group of the amide undergoes chemical reaction with a metal atom of the amide to form at least one covalent carbon-to-metal bond.
Claim 2
Dependent Claim
157 words
A process for making a transition metal carbide comprising pyrolyzing a tractable transition metal amide of the formula M.sub.x (NR.sup.1 R.sup.2).sub.y where M is a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir, Pt, and all elements from atomic number 89 on, x is an integer and is equal to or greater than 2, R 1 and R 2 are the same or different and are hydrogen, lower alkyl, trimethylsilyl, or ethylene, with the proviso that both R 1 and R 2 are not hydrogen, and y is an integer equal to the valence of the M x unit, under nonoxidizing conditions at a temperature at which a carbon-containing group of the amido group of the amide undergoes chemical reaction with a metal atom of the amide to form at least one covalent carbon-to-metal bond.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein M is a transition metal selected from the group consisting of chromium, tungsten and molybdenum.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein M is tungsten or molybdenum.
Claim 5
Dependent Claim
21 words
The process of claim 2 wherein R 1 and R 2 are the same or different and are methyl or ethyl.
Claim 6
Dependent Claim
13 words
The process of claim 2 wherein R 1 and R 2 are methyl.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the temperature is in the range of about 100° C. to about 1000° C.
Claim 8
Dependent Claim
20 words
The process of claim 3 wherein the temperature is in the range of about 200° C. and about 900° C.
Claim 9
Dependent Claim
20 words
The process of claim 4 wherein the temperature is in the range of about 200° C. and about 900° C.
Claim 10
Dependent Claim
20 words
The process of claim 5 wherein the temperature is in the range of about 200° C. and about 900° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |