US5158744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide, Fe3 Al
Assignee: Alstom SA
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Filing: 1991-06-26
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Granted: 1992-10-27
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Expires: 2011-06-26
Abstract
Abstract Oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide Fe 3 Al having the following composition: Al=24-28 at.-% Nb=0.1-2 at.-% Cr=0.1-10 at.-% B=0.1-1 at.-% Si=0.1-2 at.-% Fe=remainder. At 550° C. high temperature yield points of 500 to more than 650 MPa are obtained.
Inventors
- 👤 Mohamed Nazmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:41
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
37 words
An oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide Fe 3 Al, which alloy has the following composition: Al=24-28 at.-% Nb=0.1-2 at.-% Cr=0.1-10 at.-% B=0.1-1 at.-% Si=0.1-2 at.-% Fe=remainder.
Claim 2
Dependent Claim
37 words
An oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide Fe 3 Al, which alloy has the following composition: Al=24-28 at.-% Nb=0.1-2 at.-% Cr=0.1-10 at.-% B=0.1-1 at.-% Si=0.1-2 at.-% Fe=remainder.
Claim 3
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=28 at.-% Nb=1 at.-% Cr=5 at.-% B=0.1 at.-% Si=2 at.-% Fe=remainder.
Claim 4
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=28 at.-% Nb=1 at.-% Cr=5 at.-% B=0.1 at.-% Si=2 at.-% Fe=remainder.
Claim 5
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=28 at.-% Nb=1 at.-% Cr=5 at.-% B=1 at.-% Si=2 at.-% Fe=remainder.
Claim 6
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=28 at.-% Nb=2 at.-% Cr=4 at.-% B=0.2 at.-% Si=2 at.-% Fe=remainder.
Claim 7
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=26 at.-% Nb=0.5 at.-% Cr=6 at.-% B=0.5 at.-% Si=1.5 at.-% Fe=remainder.
Claim 8
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=26 at.-% Nb=1.5 at.-% Cr=3 at.-% B=0.7 at.-% Si=1 at.-% Fe=remainder.
Claim 9
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=26 at.-% Nb=2 at.-% Cr=1 at.-% B=1 at.-% Si=0.5 at.-% Fe=remainder.
Claim 10
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=24 at.-% Nb=1 at.-% Cr=10 at.-% B=0.5 at.-% Si=2 at.-% Fe=remainder.
Claim 11
Dependent Claim
23 words
The alloy as claimed in claim 1, which has the following composition: Al=24 at.-% Nb=0.8 at.-% Cr=5 at.-% B=0.8 at.-% Si=1 at.-% Fe=remainder.
Claim 12
Dependent Claim
19 words
The alloy as claimed in claim 1, having a yield point of at least 500 MPa at 550° C.
Claim 13
Dependent Claim
19 words
The alloy as claimed in claim 1, having a yield point of at least 650 MPa at 550° C.
Claim 14
Dependent Claim
19 words
The alloy as claimed in claim 1, having an elongation at break of at least 2% at room temperature.
Claim 15
Dependent Claim
20 words
The alloy as claimed in claim 1, having a Vickers hardness HV of at least about 250 kg/mm 2 .
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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |