US4446242A
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Synthesis of refractory materials
Assignee: United States Department of Energy
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Filing: 1983-02-28
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Granted: 1984-05-01
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Expires: 2003-02-28
Abstract
Abstract Refractory metal nitrides are synthesized during a combustion process utilizing a solid source of nitrogen. For this purpose, a metal azide is employed. The azide is combusted with a transition metal of the IIIB, IVB group, or a rare earth metal, and ignited to produce the refractory material.
Inventors
- 👤 Joseph B. Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:44
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58007; C01; C01B; C01B21/00; C01B21/06; C01B21/0602; C01B21/0615; C01B21/063; C01B21/064; C01B21/068; C01B21/076; C01B21/0761; C01B21/082; C01B21/0828; C04B35/622; C04B35/64; C04B35/65; C04B35/651; C01B21/0632; C01B21/0635; C01B21/072; C01P; C01P2004/00; C01P2004/80
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
51 words
A method of synthesizing refractory nitride compositions, comprising: (a) mixing a metal azide with at least a stoichiometric amount of a transition metal of the IIIB, IVB groups, a rare earth metal or a mixture thereof; (b) igniting the resulting mixture of step (a); and (c) forming a refractory nitride composition.
Claim 2
Independent Claim
51 words
A method of synthesizing refractory nitride compositions, comprising: (a) mixing a metal azide with at least a stoichiometric amount of a transition metal of the IIIB, IVB groups, a rare earth metal or a mixture thereof; (b) igniting the resulting mixture of step (a); and (c) forming a refractory nitride composition.
Claim 3
Dependent Claim
36 words
The method according to claim 1, wherein said metal azide of step (a) is mixed in stoichiometric proportions with Al and an oxide selected from the group TiO 2 , ZrO 2 and HfO 2 .
Claim 4
Dependent Claim
29 words
The method according to claim 1, wherein said metal azide of step (a) is mixed in stoichiometric proportions with boron and a metal selected from Zr, Ti, and Hf.
Claim 5
Dependent Claim
18 words
The method according to claim 1, wherein said metal azide is an alkaline earth or alkali metal azide.
Claim 6
Dependent Claim
13 words
The method according to claim 1, wherein said azide is NaN 3 .
Claim 7
Dependent Claim
15 words
The method according to claim 4, further comprising heating said mixture in a nitrogen atmosphere.
Claim 8
Dependent Claim
19 words
The method according to claim 4, wherein said mixture is ignited in a nitrogen atmosphere of about one atm.
Claim 9
Dependent Claim
19 words
The method according to claim 7, wherein said azide is reacted with the transition metal Ti to form TiN.
Claim 10
Dependent Claim
16 words
The method according to claim 7, wherein said azide is reacted with Zr to form ZrN.
Claim 11
Dependent Claim
16 words
The method according to claim 7, wherein said azide is reacted with Hf to form HfN.
Claim 12
Dependent Claim
28 words
The method according to claim 7, wherein said azide is reacted with Ti and C to form a composite having the formula TiC 0 .5 N 0 .5.
Claim 13
Dependent Claim
60 words
A composition of matter synthesized according to claim 1 which is a uniform composite comprising a major amount of a least one nitride selected from the IIIB and IVB groups, a rare earth metal nitride, or a mixture thereof and minor amounts of one or more alkaline earth or alkali metal and the corresponding alkaline earth or alkali metal azides.
Claim 14
Dependent Claim
57 words
The composition of matter according to claim 12 further comprising major amounts of Al 2 O 3 and minor amounts of TiO 2 and Al, wherein said uniform composite comprises major amounts of TiN and Al 2 O 3 in the ratio of 3/2 respectively with minor amounts of TiO 2 , Al and NaN 3 .
Claim 15
Dependent Claim
57 words
The composition of matter according to claim 12 further comprising major amounts of Al 2 O 3 and minor amounts of ZrO 3 and Al, wherein said uniform composite comprises major amounts of ZrN and Al 2 O 3 in the ratio of 3/2 respectively with minor amounts of ZrO 3 , Al and NaN 3 .
Claim 16
Dependent Claim
46 words
The composition of matter according to claim 12 further comprising major amounts of TiB 2 and minor amount of B, wherein said uniform composite comprises major amounts of TiB 2 and TiN in substantially equal ratios and minor amounts of Ti, B and NaN 3 .
Claim 17
Dependent Claim
46 words
The composition of matter according to claim 12 further comprising major amounts of ZrB 2 and minor amounts of B, wherein said uniform composite comprises major amounts of ZrB 2 and ZrN in substantially equal ratios and minor amounts of Zr, B and NaN 3 .
Claim 18
Dependent Claim
16 words
The composition according to claim 12, wherein said azide is reacted with Ti to form TiN.
Claim 19
Dependent Claim
16 words
The composition according to claim 12, wherein said azide is reacted with Zr to form ZrN.
Claim 20
Dependent Claim
16 words
The composition according to claim 12, wherein said azide is reacted with Hf to form HfN.
Claim 21
Dependent Claim
25 words
The composition according to claim 12, wherein said azide is reacted with Ti and C to form the composition TiC 0 .5 N 0 .5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |