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US3607435A
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Method of making sintered beta-alumina bodies
Assignee: General Electric Co
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Filing: 1969-12-17
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Granted: 1971-09-21
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Expires: 1989-12-17
Abstract
Abstract Sintered beta-alumina bodies specially suited for use as solid electrolytes are prepared through the use of alpha-alumina with sodium meta-aluminate as a binder for the formation of green bodies of good strength and as a source of sodium oxide for reaction with the alpha-alumina to produce sodium beta-alumina during the sintering operation.
Inventors
- 👤 Richard J Charles
- 👤 Stephan P Mitoff
- 👤 William G Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:56
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/028; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/113; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
The method of claim 1 in which magnesia and yttria in powder form are incorporated in the mixture in an amount of from one percent to three percent and from 0.25 percent to 5 percent, respectively.
Claim 2
Dependent Claim
29 words
The method of claim 1 in which the said moist mixture is prepared by dissolving the sodium meta-aluminate in water and mixing the resulting solution with the alpha-alumina powder.
Claim 3
Dependent Claim
17 words
The method of claim 3 in which the alpha-alumina is of particle size less than 1 micron.
Claim 4
Dependent Claim
19 words
The method of claim 3 in which the water is an aqueous solution of magnesium chloride and yttrium chloride.
Claim 5
Dependent Claim
18 words
The method of claim 1 in which the atmosphere is air of dew point temperature below 80* F.
Claim 6
Dependent Claim
19 words
The method of claim 1 in which the atmosphere is pure oxygen of dew point temperature below 80* F.
Claim 7
Dependent Claim
19 words
The method of claim 1 in Which the green body is fired at about 1825* C. for two hours.
Claim 8
Dependent Claim
21 words
The method of claim 1 in which the moist mixture is compacted by extruding it to produce a tubular green body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |