US3607436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered beta-alumina bodies and method
Assignee: General Electric Co
•
Filing: 1969-12-17
•
Granted: 1971-09-21
•
Expires: 1989-12-17
Abstract
Abstract The electrical conductivity of a sintered sodium beta-alumina solid electrolyte can be increased substantially by incorporating small proportions of magnesia and yttria in the powder mixture used to produce the sintered body.
Inventors
- 👤 Richard J Charles
- 👤 William J Dondalski
- 👤 Stephan P Mitoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/113; C01; C01F; C01F7/00; C01F7/02; C01F7/028; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/185; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
The ceramic body of claim 1 in which the amount of magnesia is about 2 percent.
Claim 2
Dependent Claim
30 words
The ceramic body of claim 1 in which the amount of magnesia is about 2 percent and the amount of yttria is from about 1 percent to about 3 percent.
Claim 3
Dependent Claim
18 words
The ceramic body of claim 1 in which the body is of substantially uniform thickness approximating 10 mils.
Claim 4
Dependent Claim
15 words
The ceramic body of claim 1 in which the body is approximately 1 millimeter thick.
Claim 5
Dependent Claim
31 words
The ceramic body of claim 1 in which thE amount of magnesia is about 2 percent and the density of the body is greater than about 90 percent of theoretical density.
Claim 6
Independent Claim
120 words
The method of making a ceramic body having density greater than 85 percent of theoretical density and electrical resistivity at 300* C., less than 100 ohm-centimeters and consequently having special utility as a solid electrolyte in a sodium-sulfur battery which includes the steps of preparing a substantially uniform powder mixture of sodium-beta alumina or potassium beta-alumina and a source of from 0.5 percent to 5.0 percent of magnesia and a source of from 0.25 percent to 5.0 percent yttria, subjecting the said powder mixture to compacting pressure and thereby forming a green body, and firing the green body under an atmospheric containing free oxygen at a temperature between 1,600* C. and 1, 900* C. and thereby sintering the green body.
Claim 7
Dependent Claim
63 words
The method of claim 7 in which the powder mixture is mixed with a binder of 10 percent polyvinyl alcohol in water and in which the resulting mixture is extruded to produce the desired green body, and in which the resulting green body is air dried at room temperature and thereafter fired at 1,825* C. for 2 hours in a dry oxygen atmosphere.
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 |