US4909842A
Expired / Lapsed
US
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Grained composite materials prepared by combustion synthesis under mechanical pressure
Assignee: United States Department of Energy
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Filing: 1988-10-21
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Granted: 1990-03-20
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Expires: 2008-10-21
Abstract
Abstract Dense, finely grained composite materials comprising one or more ceramic phase or phase and one or more metallic and/or intermetallic phase or phases are produced by combustion synthesis. Spherical ceramic grains are homogeneously dispersed within the matrix. Methods are provided, which include the step of applying mechanical pressure during or immediately after ignition, by which the microstructures in the resulting composites can be controllably selected.
Inventors
- 👤 Stephen D. Dunmead
- 👤 Joseph B. Holt
- 👤 Donald D. Kingman
- 👤 Zuhair A. Munir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C29/00; C22C29/02; C22C29/06; C22C29/10; C22C29/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A composition of matter, comprising a dense composite material which comprises one or more finely grained ceramic phase or phases and one or more intermetallic phases wherein: (a) the ceramic phase or phases is or are selected from the group consisting of TiC, TiB, TiB 2 , ZrC, ZrB 2 , HfC, HfB 2 , TaC, TaB 2 , NbC, NbB 2 , SiC and B 4 C; and wherein (b) the intermetallic phase or phases is or are selected from the group consisting of nickel aluminides, titanium aluminides, copper aluminides, titanium nickelides, titanium ferrides, and cobalt titanides.
Claim 2
Dependent Claim
98 words
A composition of matter, comprising a dense composite material which comprises one or more finely grained ceramic phase or phases and one or more intermetallic phases wherein: (a) the ceramic phase or phases is or are selected from the group consisting of TiC, TiB, TiB 2 , ZrC, ZrB 2 , HfC, HfB 2 , TaC, TaB 2 , NbC, NbB 2 , SiC and B 4 C; and wherein (b) the intermetallic phase or phases is or are selected from the group consisting of nickel aluminides, titanium aluminides, copper aluminides, titanium nickelides, titanium ferrides, and cobalt titanides.
Claim 3
Dependent Claim
33 words
A composition according to claim 1 wherein the ratio by weight of the ceramic phase phases to the intermetallic phase or phase is in the range of from about 1:10 to about 100:1.
Claim 4
Dependent Claim
34 words
A composition according to claim 1 further comprising a metallic phase or phases wherein the metallic phase or phases is or are selected from the group consisting of Al, Cu, Ni, Fe and Co.
Claim 5
Dependent Claim
42 words
A composition according to claim 1 wherein the nickel aluminides are selected from the group consisting of NiAl, Ni 3 Al, Ni 5 Al 3 , Ni 2 Al 3 and NiAl 3 and wherein the titanium aluminide is TiAl 3 .
Claim 6
Dependent Claim
28 words
A composition according to claim 4 wherein the ceramic phase is either TiC or TiB or TiB 2 and the intermetallic phase is NiAl and/or Ni 3 Al.
Claim 7
Dependent Claim
12 words
A composition according to claim 5 wherein the intermetallic phase is NiAl.
Claim 8
Dependent Claim
23 words
A composition according to claim 4 wherein the ceramic phase is TiC and the intermetallic phase is either NiAl or Ni 3 Al.
Claim 9
Dependent Claim
40 words
A composition according to claim 3 wherein the ceramic phase is TiC and wherein the intermetallic phase is selected from the group consisting of NiAl, Ni 3 Al, Ni 2 Al 3 , NiAl 3 , and TiAl 3 .
Claim 10
Dependent Claim
34 words
A composition according to claim 8 wherein the intermetallic phase is either Ni 2 Al 3 or Ni 3 Al and NiAl or Ni 2 Al 3 , NiAl 3 and TiAl 3 .
Claim 11
Dependent Claim
16 words
A composition according to claim 3 wherein said ratio is from about 1:3 to about 7:1.
Claim 12
Dependent Claim
33 words
A composition according to claim 1 wherein the density of said composite material is about or greater than 95%, and the diameter of the ceramic grains is about or less than 5 microns.
Claim 13
Dependent Claim
29 words
A composition according to claim 11 wherein the density is about or greater than 97%, and the diameter of the ceramic grains is about or less than 2 microns.
Claim 14
Dependent Claim
29 words
A composition according to claim 12 wherein the density is about or greater than 99%, and the diameter of the ceramic grains is about or less than 1 micron.
Claim 15
Dependent Claim
15 words
A composition according to claim 1 wherein the ceramic grains are spherical and well dispersed.
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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) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |