US4244736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yttrium containing alloys
Assignee: Johnson Matthey PLC
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Filing: 1978-07-05
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Granted: 1981-01-13
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Expires: 1998-07-05
Abstract
Abstract This invention relates to the production of oxidation resistant alloys containing iron, chromium, aluminium and yttrium and/or other rare earth metal or metals in which yttrium and/or other rare earth metal or metals is added to a melt in the form of a master alloy, the master alloy having a melting point of less than 1000 DEG C. The invention also includes an oxidation resistant alloy containing, apart from impurities, yttrium 0.1-3.0%, chromium 5-15%, aluminium 4-6% and iron-balance.
Inventors
- 👤 Joseph G. Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:01
CPC Classifications
C; C22; C22C; C22C28/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
54 words
A process for the production of alloys containing iron, chromium, aluminium and yttrium and/or other rare earth metal or metals in which yttrium and/or other rare earth metal or metals is added to a melt in the form of a master alloy, the master alloy having a melting point of less than 1000° C.
Claim 2
Dependent Claim
54 words
A process for the production of alloys containing iron, chromium, aluminium and yttrium and/or other rare earth metal or metals in which yttrium and/or other rare earth metal or metals is added to a melt in the form of a master alloy, the master alloy having a melting point of less than 1000° C.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 in which the master alloy is an alloy of yttrium and iron aluminium.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 2 in which the master alloy consists of 75% by weight of the rare earth metal and 25% by weight of iron.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 2 in which the master alloy consists of 90% by weight of the rare earth metal and 10% by weight of aluminium.
Claim 6
Dependent Claim
30 words
A process as claimed in claim 2 in which the master alloy consists of 80% by weight of yttrium, 10% by weight of aluminium and 10% by weight of iron.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 1 in which the resulting alloy contains from 0.1% to 3.0% by weight of the rare earth metal.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 6 in which the resulting alloy contains about 0.3% by weight of the rare earth metal.
Claim 9
Dependent Claim
26 words
A process as claimed in any one of the preceding claims in which the addition is made to the melt in an atmosphere free from oxygen.
Claim 10
Dependent Claim
16 words
An alloy produced by a process as claimed in any one of claims 1 to 7.
Claim 11
Dependent Claim
18 words
An oxidation-resistant alloy containing by weight: ______________________________________
yttrium 0.1- 3.0%
chromium
5- 15%
aluminium
4-6%
iron balance
______________________________________
Claim 12
Dependent Claim
18 words
An oxidation-resistant alloy containing by weight: ______________________________________
yttrium 0.1- 3.0%
chromium
5- 15%
aluminium
4-6%
iron balance
______________________________________
Claim 13
Dependent Claim
27 words
An oxidation-resistant alloy containing apart from impurities, 1-20% by weight chromium, 0.5-12% by weight aluminium, 0.1-3% by weight of at least one rare earth metal, balance iron.
Claim 14
Dependent Claim
27 words
An oxidation-resistant alloy containing apart from impurities, 1-20% by weight chromium, 0.5-12% by weight aluminium, 0.1-3% by weight of at least one rare earth metal, balance iron.
Claim 15
Dependent Claim
16 words
An alloy as claimed in claim 10 or 11 containing lanthanum, praseodymium, neodymium, samarium and cerium.
Claim 16
Dependent Claim
17 words
An alloy as claimed in claim 10 or 11 containing yttrium and erbium with cerium and lanthanum.
Claim 17
Dependent Claim
34 words
An alloy as claimed in claim 10 or 11 wherein the rare earth metal is obtained from at least one of the following minerals: Cerite, Orthite (Allanite), Gadolinite, Xenotime, Fergusonite, Australian fergusonite, Yttrotantalite, Monazite.
Claim 18
Dependent Claim
21 words
A process as in any one of claims 1, 3, 4, 6 or 7 wherein the rare earth metal includes yttrium.
Claim 19
Dependent Claim
13 words
An alloy as in claim 11 wherein the rare earth metal includes yttrium.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |