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US4249969A
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Method of enhancing the magnetic properties of an Fea Bb Sic d amorphous alloy
Assignee: Honeywell International Inc
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Filing: 1979-12-10
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Granted: 1981-02-10
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Expires: 1999-12-10
Abstract
Abstract An amorphous metal alloy which is at least 90% amorphous having enhanced magnetic properties and consisting essentially of a composition having the formula FeaBbSicCd wherein "a", "b", "c" and "d" are atomic percentages ranging from about 80.0 to 82.0, 12.5 to 14.5, 2.5 to 5.0 and 1.5 to 2.5, respectively, with the proviso that the sum of "a", "b", "c" and "d" equals 100.
Inventors
- 👤 Nicholas J. DeCristofaro
- 👤 Alfred Freilich
- 👤 Davidson M. Nathasingh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:49
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308; C; C21; C21D; C21D1/00; C21D1/04; C21D6/00; C22; C22C; C22C33/00; C22C33/003; C22C45/00; C22C45/02; H01F1/15333; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A method of enhancing the magnetic properties of a metal alloy which is at least 90% amorphous consisting essentially of a composition having the formula Fe a B b Si c C d wherein "a", "b", "c" and "d" are atomic percentages ranging from about 80.0 to 82.0, 12.5 to 14.5, 2.5 to 5.0 and 1.5 to 2.5, respectively, with the proviso that the sum of "a", "b", "c" and "d" equals 100, which method comprises the step of annealing said alloy.
Claim 2
Independent Claim
82 words
A method of enhancing the magnetic properties of a metal alloy which is at least 90% amorphous consisting essentially of a composition having the formula Fe a B b Si c C d wherein "a", "b", "c" and "d" are atomic percentages ranging from about 80.0 to 82.0, 12.5 to 14.5, 2.5 to 5.0 and 1.5 to 2.5, respectively, with the proviso that the sum of "a", "b", "c" and "d" equals 100, which method comprises the step of annealing said alloy.
Claim 3
Dependent Claim
57 words
A method as recited in claim 1, wherein said annealing step comprises: heating said alloy to a temperature sufficient to achieve stress relief but less than that required to initiate crystallization; cooling said alloy at a rate of about 0.5° C./min. to 75° C./min.; and applying a magnetic field to said alloy during said heating and cooling.
Claim 4
Dependent Claim
22 words
A method as recited in claim 2, wherein the temperature range for heating said alloy is about 340° C. to 385° C.
Claim 5
Dependent Claim
54 words
A method as recited in claim 1, wherein said annealing step comprises: heating said alloy to a temperature in the range of about 345° C. to 380° C.; cooling said alloy at a rate of about 1° C./min. to 16° C./min.; and applying a magnetic field to said alloy during said heating and cooling.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |