US4507263A
Expired / Lapsed
US
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Method for preparing improved porous metal-hydride compacts
Assignee: Technion Research and Development Foundation Ltd
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Filing: 1983-07-29
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Granted: 1985-03-26
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Expires: 2003-07-29
Abstract
Abstract The present invention relates to a method and apparatus for preparing metal-embedded porous metallic-hydride (pmh) compacts capable of withstanding repeated hydriding-dehydring cycles without disintegrating. According to the invention, the finely divided hydridable metal alloy hydride is admixed with a finely divided metal selected from Al, Ni, Cu or other transition metals and charged with hydrogen. The resulting mixture is sintered in a furnace in which hydrogen is introduced at a pressure above the equilibrium pressure to the prevailing temperature, mechanical stress being applied simultaneously. The compacts obtained possess outstanding stability, as shown by the fact that they have remained intact even after more than 6000 cycles.
Inventors
- 👤 Moshe Ron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:41
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/001; B22F3/10; B22F3/11; B22F3/1143; C; C01; C01B; C01B3/00; C01B3/0005; C01B3/001; C01B3/0078; B22F2998/00; B22F2998/10; B22F2999/00; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A method for preparing improved porous metal hydride compacts consisting of a sintered metal-embedded porous metal hydride, the method comprising the steps of: (a) preparing an intimate mixture, in powder form, of a finely divided hydridable metal alloy hydride and a finely divided metal; (b) hydriding said powder by charging it with hydrogen, and (c) sintering the hydrided metal-embedded metal hydride in a furnace wherein hydrogen is supplied at a pressure above equilibrium pressure appropriate to the prevailing temperature, and mechanical stress is applied simultaneously.
Claim 2
Independent Claim
85 words
A method for preparing improved porous metal hydride compacts consisting of a sintered metal-embedded porous metal hydride, the method comprising the steps of: (a) preparing an intimate mixture, in powder form, of a finely divided hydridable metal alloy hydride and a finely divided metal; (b) hydriding said powder by charging it with hydrogen, and (c) sintering the hydrided metal-embedded metal hydride in a furnace wherein hydrogen is supplied at a pressure above equilibrium pressure appropriate to the prevailing temperature, and mechanical stress is applied simultaneously.
Claim 3
Dependent Claim
15 words
The method according to claim 1, wherein the embedding metal is selected from transition metals.
Claim 4
Dependent Claim
24 words
The method according to claim 1, wherein the amount of metal in the compacts is between 7 and 30% by weight of the compacts.
Claim 5
Dependent Claim
20 words
The method according to claim 1, wherein the particle size of the finely divided metal is from 1 to 50μ.
Claim 6
Dependent Claim
28 words
The method according to claim 1, wherein the mixture of metal hydride and finely divided metal is of a particle size in the range of 1μ to 20μ.
Claim 7
Dependent Claim
31 words
The method according to claim 1, wherein the mixture of metal hydride and finely divided metal is hydrided by hydrogen at a pressure in the range of 100 to 500 psi.
Claim 8
Dependent Claim
40 words
The method according to claim 1, wherein the hydrided metal hydride containing the finely divided metal hydride (obtained in step (b) is compressed into pellets by means of compacting at room temperature and hydrogen pressure, prior to the sintering step.
Claim 9
Dependent Claim
26 words
The method according to claim 7, wherein the mixture of hydrided metal hydride and finely divided metal is compressed under a pressure not exceeding 350 kpsi.
Claim 10
Dependent Claim
40 words
The method according to claim 1, wherein the sintering step is carried out at a temperature in the range of 100° to 200° C., at a hydrogen pressure of about 250 atmosphere, and under mechanical stresses, all applied substantially simultaneously.
Claim 11
Dependent Claim
30 words
The method according to claim 1, wherein the hydridable metal is selected from the group consisting of LaNi 5 and MNi 4 .15 Fe 0 .85, wherein M is mischemetal.
References Cited (Backward Citations)
US3943210A
Cited
US4292265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |