US4961903A
Expired / Lapsed
US
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Iron aluminide alloys with improved properties for high temperature applications
Assignee: Lockheed Martin Energy Systems Inc
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Filing: 1989-03-07
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Granted: 1990-10-09
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Expires: 2009-03-07
Abstract
Abstract An improved iron aluminide alloy of the DO 3 type that has increased room temperature ductility and improved high elevated temperature strength. The alloy system further is resistant to corrosive attack in the environments of advanced energy corrosion systems such as those using fossil fuels. The resultant alloy is relatively inexpensive as contrasted to nickel based and high nickel steels currently utilized for structural components. The alloy system consists essentially of 26-30 at. % aluminum, 0.5-10 at. % chromium, 0.02-0.3 at. % boron plus carbon, up to 2 at. % molybdenum, up to 1 at. % niobium, up to 0.5 at. % zirconium, up to 0.1 at. % yttrium, up to 0.5 at. % vanadium and the balance iron.
Inventors
- 👤 Claudette G. McKamey
- 👤 Chain T. Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:48
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/06
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
23 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.02-0.3 at.% boron and the balance iron.
Claim 2
Dependent Claim
23 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.02-0.3 at.% boron and the balance iron.
Claim 3
Dependent Claim
17 words
The alloy of claim 1 wherein carbon is substituted for at least a portion of said boron.
Claim 4
Dependent Claim
14 words
The alloy of claim 2 further consisting essentially of up to 2 at.% molybdenum.
Claim 5
Dependent Claim
14 words
The alloy of claim 3 further consisting essentially of up to 1 at.% niobium.
Claim 6
Dependent Claim
14 words
The alloy of claim 3 further consisting essentially of up to 0.5 at.% zirconium.
Claim 7
Dependent Claim
14 words
The alloy of claim 3 further consisting essentially of up to 0.5 at.% vanadium.
Claim 8
Dependent Claim
14 words
The alloy of claim 3 further consisting essentially of up to 0.1 at.% yttrium.
Claim 9
Dependent Claim
14 words
The alloy of claim 2 further consisting essentially of up to 1 at.% niobium.
Claim 10
Dependent Claim
14 words
The alloy of claim 8 further consisting essentially of up to 0.5 at.% zirconium.
Claim 11
Dependent Claim
14 words
The alloy of claim 2 further consisting essentially of up to 0.5 at.% zirconium.
Claim 12
Dependent Claim
23 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminium, 0.5-10 at.% chromium, 0.02-0.3 at.% carbon and the balance iron.
Claim 13
Dependent Claim
23 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminium, 0.5-10 at.% chromium, 0.02-0.3 at.% carbon and the balance iron.
Claim 14
Dependent Claim
14 words
The alloy of claim 11 further consisting essentially of up to 1 at.% niobium.
Claim 15
Dependent Claim
14 words
The alloy of claim 12 further consisting essentially of up to 0.5 at.% zirconium.
Claim 16
Dependent Claim
14 words
The alloy of claim 11 further consisting essentially of up to 2 at.% molybdenum.
Claim 17
Dependent Claim
14 words
The alloy of claim 14 further consisting essentially of up to 0.1 at.% yttrium.
Claim 18
Dependent Claim
28 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% boron plus carbon, and the balance iron.
Claim 19
Dependent Claim
28 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% boron plus carbon, and the balance iron.
Claim 20
Dependent Claim
14 words
The alloy of claim 16 further consisting essentially of up to 1 at.% niobium.
Claim 21
Dependent Claim
14 words
The alloy of claim 16 further consisting essentially of up to 0.5 at.% zirconium.
Claim 22
Dependent Claim
14 words
The alloy of claim 16 further consisting essentially of up to 0.5 at vanadium.
Claim 23
Dependent Claim
14 words
The alloy of claim 16 further consisting essentially of up to 0.1 at.% yttrium.
Claim 24
Dependent Claim
38 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% boron plus carbon, up to 1.0 at.% niobium, up to 0.5 at.% zirconium and the balance iron.
Claim 25
Dependent Claim
38 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% boron plus carbon, up to 1.0 at.% niobium, up to 0.5 at.% zirconium and the balance iron.
Claim 26
Dependent Claim
29 words
The alloy of claim 21 consisting essentially of 26-30 at.% aluminum, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.3 at.% boron plus carbon, 0.1 at.% yttrium and the balance iron.
Claim 27
Dependent Claim
14 words
The alloy of claim 21 further consisting essentially of up to 0.1 at.% yttrium.
Claim 28
Dependent Claim
14 words
The alloy of claim 21 further consisting essentially of up to 0.5 at.% vanadium.
Claim 29
Dependent Claim
46 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminium, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% carbon, up to 1.0 at.% niobium, up to 0.5 at.% zirconium, up to 0.1 at.% yttrium, up to 0.5 at.% vanadium and the balance iron.
Claim 30
Dependent Claim
46 words
An alloy of the DO 3 type consisting essentially of 26-30 at.% aluminium, 0.5-10 at.% chromium, 0.1-2.0 at.% molybdenum, 0.02-0.3 at.% carbon, up to 1.0 at.% niobium, up to 0.5 at.% zirconium, up to 0.1 at.% yttrium, up to 0.5 at.% vanadium and the balance iron.
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) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |