US4292209A
Expired / Lapsed
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Ceramic component for MHD electrode
Assignee: United States Department of Energy
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Filing: 1979-05-02
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Granted: 1981-09-29
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Expires: 1999-05-02
Abstract
Abstract A ceramic component which exhibits electrical conductivity down to near room temperatures has the formula: HfxInyAzO2 where x=0.1 to 0.4, y=0.3 to 0.6, z=0.1 to 0.4 and A is a lanthanide rare earth or yttrium. The component is suitable for use in the fabrication of MHD electrodes or as the current leadout portion of a composite electrode with other ceramic components.
Inventors
- 👤 David D. Marchant
- 👤 Junior L. Bates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:37
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/08; H02K44/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A ceramic component for an MHD generator electrode having the formula: Hf x In y A z O 2 where x=0.1 to 0.4, y=0.3 to 0.6, z=0.1 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium.
Claim 2
Dependent Claim
48 words
A ceramic component for an MHD generator electrode having the formula: Hf x In y A z O 2 where x=0.1 to 0.4, y=0.3 to 0.6, z=0.1 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium.
Claim 3
Dependent Claim
90 words
A composite electrode for use in a magnetohydrodynamic generator comprising: a base portion constructed of a ceramic component having the formula: Hf x In y A z O 2 wherein x=0.1 to 0.4, y=0.3 to 0.5, z=0.2 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium, and a cap portion attached to the base, the cap being constructed of a ceramic component selected from the group consisting of stabilized zirconium oxide, stabilized hafnium oxide and terbium stabilized hafnium.
Claim 4
Dependent Claim
90 words
A composite electrode for use in a magnetohydrodynamic generator comprising: a base portion constructed of a ceramic component having the formula: Hf x In y A z O 2 wherein x=0.1 to 0.4, y=0.3 to 0.5, z=0.2 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium, and a cap portion attached to the base, the cap being constructed of a ceramic component selected from the group consisting of stabilized zirconium oxide, stabilized hafnium oxide and terbium stabilized hafnium.
Claim 5
Dependent Claim
13 words
The electrode of claim 1 wherein the cap portion is terbium stabilized hafnium.
Claim 6
Dependent Claim
49 words
The electrode of claim 3 wherein the terbium stabilized hafnium also contains up to about 10 mole percent of a rare earth oxide selected from the group consisting of PrO 2 , Yb 2 O 3 and a mixture of Pr 2 O 2 and Yb 2 O 3
Claim 7
Dependent Claim
52 words
An electrode for use in a magnetohydrodynamic generator comprising: a ceramic component having the formula: Hf x In y A z O 2 where x=0.1 to 0.4, y=0.3 to 0.6, z=0.1 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium.
Claim 8
Dependent Claim
52 words
An electrode for use in a magnetohydrodynamic generator comprising: a ceramic component having the formula: Hf x In y A z O 2 where x=0.1 to 0.4, y=0.3 to 0.6, z=0.1 to 0.4 and A is one or more elements selected from the group consisting of yttrium, ytterbium, terbium, praseodynium and cerium.
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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |