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Patent US5320802A successfully refreshed from Google Patents.
US5320802A
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US
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Corrosion resistant iron aluminides exhibiting improved mechanical properties and corrosion resistance
Assignee: Lockheed Martin Energy Systems Inc
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Filing: 1992-05-15
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Granted: 1994-06-14
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Expires: 2012-05-15
Abstract
Abstract The specification discloses a corrosion-resistant intermetallic alloy comprising, in atomic percent, an FeAl iron aluminide containing from about 30 to about 40% aluminum alloyed with from about 0.01 to 0.4% zirconium and from 0.01 to about 0.8% boron. The alloy exhibits considerably improved room temperature ductility for enhanced usefulness in structural applications. The high temperature strength and fabricability is improved by alloying with molybdenum, carbon, chromium and vanadium.
Inventors
- 👤 Chain T. Liu
- 👤 Claudette G. McKamey
- 👤 Peter F. Tortorelli
- 👤 Stan A. David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:49
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 30% to about 40% aluminum alloyed with from about 0.01 to about 0.4% zirconium, boron in an amount no more than about 0.8% wherein the boron/zirconium ratio is at least about 2 to 1, and from about 0.2% Mo to less than about 0.5% Mo, wherein the alloy exhibits improved room temperature ductility.
Claim 2
Dependent Claim
69 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 30% to about 40% aluminum alloyed with from about 0.01 to about 0.4% zirconium, boron in an amount no more than about 0.8% wherein the boron/zirconium ratio is at least about 2 to 1, and from about 0.2% Mo to less than about 0.5% Mo, wherein the alloy exhibits improved room temperature ductility.
Claim 3
Dependent Claim
19 words
The alloy of claim 1, wherein the boron/zirconium ratio is between about 2 to 1 and 2.5 to 1.
Claim 4
Dependent Claim
54 words
The alloy of claim 1, wherein the Zr is present in an amount of about 0.05%, the B is present in an amount of about 0.24% and the Mo is present in an amount of about 0.2%, wherein the alloy has a tensile ductility of about 11.8% at a temperature of about 70° C.
Claim 5
Dependent Claim
32 words
The alloy of claim 1, further comprising from about 0.01% to about 0.07% chromium and from about 0.01% to about 2% vanadium, wherein the alloy also exhibits improved strength at high temperatures.
Claim 6
Dependent Claim
49 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 36% aluminum alloyed with about 0.05% zirconium, about 0.2% boron and carbon, about 0.2% Mo, about 2% Cr, about 0.2% vanadium, and the balance iron, wherein the alloy exhibits improved room temperature ductility.
Claim 7
Dependent Claim
49 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 36% aluminum alloyed with about 0.05% zirconium, about 0.2% boron and carbon, about 0.2% Mo, about 2% Cr, about 0.2% vanadium, and the balance iron, wherein the alloy exhibits improved room temperature ductility.
Claim 8
Dependent Claim
49 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 35% to about 36% aluminum alloyed with about 0.1% zirconium, about 0.24% boron and about 0.2% Mo, wherein the alloy exhibits a ductility of about 11.8% at a temperature of about 70° C.
Claim 9
Dependent Claim
49 words
A corrosion resistant intermetallic alloy, comprising, in atomic percent, an FeAl iron aluminide containing from about 35% to about 36% aluminum alloyed with about 0.1% zirconium, about 0.24% boron and about 0.2% Mo, wherein the alloy exhibits a ductility of about 11.8% at a temperature of about 70° C.
References Cited (Backward Citations)
US4961903A
Cited
US5084109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |