US4251344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous nickel coated electrodes
Assignee: EIDP Inc
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Filing: 1980-01-22
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Granted: 1981-02-17
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Expires: 2000-01-22
Abstract
Abstract An improved electrode having a surface mixture of nickel and porous nickel produced by applying a paste mixture of NiAl 2 and Ni 3 B together with a vehicle to a substrate. After burning off the vehicle and firing in air at a temperature of 450° to 650° C. and thereafter sintering at a temperature of 800° to 900° C. in nitrogen, the coating on the substrate contains Ni 2 Al 3 , NiAl 2 B and nickel together with a thin overlayer of B 2 O 3 . After removing the intermetallic aluminum, boron and boron oxide by dissolution with sodium hydroxide, the surface of the substrate contains Raney nickel supported on a structure of nickel. The resulting electrodes can be used as cathodes in water or brine electrolysis cells.
Inventors
- 👤 Christopher R. S. Needes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:54
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/98; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A paste composition suitable for application to a substrate said composition consisting essentially of a mixture of solids containing 40 to 80 percent by weight intermetallic aluminum of the formula NiAl 3 and 20 to 60 percent by weight intermetallic boron of the formula Ni 3 B and an organic liquid vehicle, the solids:liquid vehicle ratio being 4:1 to 8:1.
Claim 2
Dependent Claim
60 words
A paste composition suitable for application to a substrate said composition consisting essentially of a mixture of solids containing 40 to 80 percent by weight intermetallic aluminum of the formula NiAl 3 and 20 to 60 percent by weight intermetallic boron of the formula Ni 3 B and an organic liquid vehicle, the solids:liquid vehicle ratio being 4:1 to 8:1.
Claim 3
Dependent Claim
31 words
A paste composition according to claim 1 wherein the solids consist of 30 to 50 percent by weight Ni 3 B and 50 to 70 percent by weight NiAl 3 .
Claim 4
Dependent Claim
19 words
A paste composition according to claim 1 wherein the vehicle is an ethylene glycol copolymer dissolved in hexyl carbitol.
Claim 5
Dependent Claim
20 words
A paste composition according to claim 3 wherein the ratio of solids to ethylene glycol copolymer is 25:1 to 30:1.
Claim 6
Dependent Claim
72 words
In a process for making a nickel-coated electrode, the improvement wherein a paste composition according to claim 1 is applied to a substrate, is fired in air at 450° to 650° C., sintered in a nitrogen atmosphere at 800° to 900° to form a precursor coating on said substrate consisting of Ni 2 Al 3 and NiAl 2 B and the intermetallic aluminum and intermetallic boron are thereafter substantially removed by dissolution.
Claim 7
Dependent Claim
40 words
The process according to claim 5 wherein the substrate is mild steel and the paste composition is applied by dipping the steel into the paste composition at least three times and drying the paste on the steel after each dipping.
Claim 8
Dependent Claim
83 words
A cathode for use in brine electrolysis cells for the production of chlorine, hydrogen and caustic, said cathode being formed by applying to a substrate a paste composition according to claim 1, firing the coating at 450° to 650° C. in air, sintering in a nitrogen atmosphere at 800° to 900° C. to form a precursor structure consisting of Ni 2 Al 3 and NiAl 2 B and thereafter substantially removing the intermetallic aluminum and intermetallic boron by dissolution to form the cathode.
References Cited (Backward Citations)
US3291642A
Cited
US3437526A
Cited
US3379635A
Cited
GB1073492A
Cited
US3408231A
Cited
US3637437A
Cited
US3846344A
Cited
US3926844A
Cited
US4024044A
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US4049580A
Cited
US4116804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |