US4262233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of amorphous magnetic alloys to produce a wide range of magnetic properties
Assignee: General Electric Co
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Filing: 1978-06-02
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Granted: 1981-04-14
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Expires: 1998-06-02
Abstract
Abstract Amorphous magnetic metal alloys are processed by annealing at temperatures sufficient to achieve stress relief and cooling in directed magnetic fields or in zero magnetic fields. The ac and dc properties of magnetic cores produced in accordance with the processes of the invention may be tailored to match those of a wide range of magnetic alloys. Alloys processed in accordance with the invention provide improved performance in inductors, transformers, magnetometers, and electrodeless lamps.
Inventors
- 👤 Joseph J. Becker
- 👤 Fred E. Luborsky
- 👤 Israel S. Jacobs
- 👤 Richard O. McCary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:03
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/04; C21D6/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
64 words
A magnetic core comprising a ribbon of amorphous alloy heated to a temperature sufficient to achieve stress relief but less than that required to initiate crystallization and then controllably cooled in the presence of a magnetic field, the rate of cooling being between approximately 0.1° C. per minute and approximately 100° C. per minute, said cooled ribbon being disposed in a spirally wound toroid.
Claim 2
Dependent Claim
64 words
A magnetic core comprising a ribbon of amorphous alloy heated to a temperature sufficient to achieve stress relief but less than that required to initiate crystallization and then controllably cooled in the presence of a magnetic field, the rate of cooling being between approximately 0.1° C. per minute and approximately 100° C. per minute, said cooled ribbon being disposed in a spirally wound toroid.
Claim 3
Dependent Claim
15 words
An inductor comprising the toroid of claim 1 and a conductive winding linking said toroid.
Claim 4
Dependent Claim
17 words
A transformer comprising the toroid of claim 1 and at least two conductive windings linking said toroid.
Claim 5
Independent Claim
70 words
A method for manufacturing a magnetic core comprising the steps of: spirally winding a ribbon of a magnetic amorphous metal alloy to form a toroidal body; and heating said toroidal body to a temperature sufficient to achieve stress relief of said amorphous metal alloy, but less than that required to initiate crystallization of said alloy, whereby a stress induced degradation of the magnetic properties of said toroidal body is alleviated.
Claim 6
Independent Claim
70 words
A method for manufacturing a magnetic core comprising the steps of: spirally winding a ribbon of a magnetic amorphous metal alloy to form a toroidal body; and heating said toroidal body to a temperature sufficient to achieve stress relief of said amorphous metal alloy, but less than that required to initiate crystallization of said alloy, whereby a stress induced degradation of the magnetic properties of said toroidal body is alleviated.
Claim 7
Dependent Claim
24 words
The method of claim 4 wherein said amorphous alloy comprises iron and materials selected from the group consisting of nickel, cobalt, and mixtures thereof.
Claim 8
Dependent Claim
20 words
The method of claim 4 wherein said amorphous metal alloy comprises Fe 40 Ni 40 P 14 B 6 .
Claim 9
Dependent Claim
24 words
The method of claim 4 wherein said amorphous metal alloy comprises (Fe x Ni y Co z ).sub.˜80 G.sub.˜20 where G are glass-former atoms.
Claim 10
Dependent Claim
22 words
The method of claim 4 further comprising the step of: annealing said toroidal body in the presence of a directed magnetic field.
Claim 11
Dependent Claim
42 words
The method of claim 7 wherein said annealing step comprises heating said toroidal body through the Curie temperature of said amorphous alloy and cooling said toroidal body through the Curie temperature of said amorphous alloy in the presence of said magnetic field.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein said magnetic field is disposed circumferentially with respect to said toroidal body.
Claim 13
Dependent Claim
18 words
As a product of manufacture, a toroidal magnetic core produced in accordance with the methods of claim 10.
Claim 14
Dependent Claim
20 words
As a product of manufacture, an inductor comprising the core of claim 11 and a conductive winding linking said core.
Claim 15
Dependent Claim
22 words
As a product of manufacture, a transformer comprising the core of claim 11 and at least two conductive windings linking said core.
Claim 16
Dependent Claim
22 words
The method of claim 9 wherein said magnetic field is directed in the plane of said ribbon and transverse to its length.
Claim 17
Dependent Claim
18 words
As a product of manufacture, a toroidal magnetic core produced in accordance with the method of claim 14.
Claim 18
Dependent Claim
20 words
As a product of manufacture, an inductor comprising the core of claim 15 and a conductive winding linking said core.
Claim 19
Dependent Claim
22 words
As a product of manufacture, a transformer comprising the core of claim 15 and at least two conductive windings linking said core.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |