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Patent US4292083A successfully refreshed from Google Patents.
US4292083A
Expired / Lapsed
US
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High temperature, low expansion, corrosion resistant ceramic and gas turbine
Assignee: United States Department of Energy
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Filing: 1980-04-18
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Granted: 1981-09-29
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Expires: 2000-04-18
Abstract
Abstract The present invention relates to ZrO2-MgO-Al2O3-SiO2 ceramic materials having improved thermal stability and corrosion resistant properties. The utilization of these ceramic materials as heat exchangers for gas turbine engines is also disclosed.
Inventors
- 👤 Harry W. Rauch, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
41 words
A high temperature, low expansion, corrosion resistant ceramic material consisting essentially of about 3-13 weight percent MgO, about 29-44 weight percent Al 2 O 3 , about 40-51 weight percent SiO 2 , and about 3-17 weight percent ZrO 2 .
Claim 2
Dependent Claim
41 words
A high temperature, low expansion, corrosion resistant ceramic material consisting essentially of about 3-13 weight percent MgO, about 29-44 weight percent Al 2 O 3 , about 40-51 weight percent SiO 2 , and about 3-17 weight percent ZrO 2 .
Claim 3
Dependent Claim
16 words
The ceramic material of claim 1 wherein the MgO is present in about 11-13 weight percent.
Claim 4
Dependent Claim
17 words
The ceramic material of claim 1 wherein the SiO 2 is present in about 48-51 weight percent.
Claim 5
Dependent Claim
17 words
The ceramic material of claim 1 wherein the ZrO 2 is present in about 3-10 weight percent.
Claim 6
Dependent Claim
25 words
The ceramic material of claim 1 wherein the thermal expansion characteristic is no greater than 2.0×10 -6 /°C. over a temperature range of 25°-1200° C.
Claim 7
Dependent Claim
54 words
The ceramic material of claim 1 consisting essentially of about 11-13 weight percent MgO, about 33-35 weight percent Al 2 O 3 , about 48-51 weight percent SiO 2 and about 3-10 weight percent ZrO 2 , said material being further characterized by a thermal expansion characteristic of no greater than 2.0×10 -6 /°C.
Claim 8
Dependent Claim
28 words
The ceramic material of claim 6 being further characterized by a thermal expansion characteristic of no greater than 2.0×10 -6 /°C. over a temperature range of 25°-1200° C.
Claim 9
Dependent Claim
15 words
A ceramic gas turbine heat exchanger consisting essentially of the composition recited in claim 1.
Claim 10
Dependent Claim
15 words
A ceramic gas turbine heat exchanger consisting essentially of the composition recited in claim 2.
Claim 11
Dependent Claim
15 words
A ceramic gas turbine heat exchanger consisting essentially of the composition recited in claim 3.
Claim 12
Dependent Claim
15 words
A ceramic gas turbine heat exchanger consisting essentially of the composition recited in claim 4.
Claim 13
Dependent Claim
37 words
A ceramic gas turbine heat exchanger consisting essentially of about 11-13 weight percent MgO, about 33-35 weight percent Al 2 O 3 , about 48-51 weight percent SiO 2 and about 3-10 weight percent ZrO 2 .
Claim 14
Dependent Claim
37 words
A ceramic gas turbine heat exchanger consisting essentially of about 11-13 weight percent MgO, about 33-35 weight percent Al 2 O 3 , about 48-51 weight percent SiO 2 and about 3-10 weight percent ZrO 2 .
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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 |