US4311539A
Expired / Lapsed
US
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Method of manufacturing a high permeability amorphous magnetic alloy
Assignee: Sony Corp
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Filing: 1980-05-28
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Granted: 1982-01-19
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Expires: 2000-05-28
Abstract
Abstract A method of manufacturing an high permeability amorphous magnetic alloy is disclosed. In the method, an amorphous alloy ribbon is annealed at an elevated temperature T(°K.) satisfying the relation 0.95×Tc (°K.)≦T(°K.)<Tcry(°K.) where Tc is a magnetic Curie temperature and Tcry is a crystallization temperature of the alloy. Then the ribbon is quenched to a room temperature from the elevated temperature. The quenched amorphous alloy ribbon is again annealed at a temperature between 100° C. and 250° C. By the method, the amorphous magnetic alloy shows a high permeability over a wide frequency range and flat frequency response characteristics of permeability over a wide frequency range.
Inventors
- 👤 Satoru Uedaira
- 👤 Shigeyasu Ito
- 👤 Koichi Aso
- 👤 Masatoshi Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:59
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/04; C21; C21D; C21D6/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A method of manufacturing a high permeability amorphous magnetic alloy comprising the steps of; (a) preparing an amorphous magnetic alloy having a Curie temperature Tc(°K.) which is lower than its crystallization temperature Tcry (°K.), said alloy containing between 70 and 78 atomic % of Co, Fe, and Ni, and 22 to 30 atomic % of at least one of the glass forming elements Si, B, P, C, and Ge, (b) keeping said alloy at a first temperature T 1 (°K.) satisfying the relation 0.95>Tc(°K.)≦T 1 (°K.)<Tcry(°K.), (c) quenching said alloy from said first temperature T 1 (°K.), and (d) annealing said alloy at a second temperature T 2 between 100° and 250° C. in the absence of an applied magnetic field.
Claim 2
Independent Claim
121 words
A method of manufacturing a high permeability amorphous magnetic alloy comprising the steps of; (a) preparing an amorphous magnetic alloy having a Curie temperature Tc(°K.) which is lower than its crystallization temperature Tcry (°K.), said alloy containing between 70 and 78 atomic % of Co, Fe, and Ni, and 22 to 30 atomic % of at least one of the glass forming elements Si, B, P, C, and Ge, (b) keeping said alloy at a first temperature T 1 (°K.) satisfying the relation 0.95>Tc(°K.)≦T 1 (°K.)<Tcry(°K.), (c) quenching said alloy from said first temperature T 1 (°K.), and (d) annealing said alloy at a second temperature T 2 between 100° and 250° C. in the absence of an applied magnetic field.
Claim 3
Independent Claim
140 words
A method of manufacturing a high permeability amorphous magnetic alloy for use as a core element of a magnetic circuit, comprising the steps of; (a) preparing an amorphous magnetic alloy having a predetermined shape as said core element, said alloy having a Curie temperature Tc(°K.) which is lower than its crystallization temperature Tcry(°K.), said alloy containing between 70 to 78 atomic % of Co, Fe, and Ni, and 22 to 30 atomic % of at least one of the glass forming elements Si, B, P, C, and Ge, (b) keeping said alloy at a first temperature T 1 (°K.) satisfying the relation 0.9×Tc(°K.)≦T 1 (°K.)<Tcry(°K.), (c) quenching said alloy from said first temperature T 1 (°K.), and (d) annealing said alloy at a second temperature T 2 between 100° and 250° C. in the absence of an applied magnetic field.
Claim 4
Independent Claim
140 words
A method of manufacturing a high permeability amorphous magnetic alloy for use as a core element of a magnetic circuit, comprising the steps of; (a) preparing an amorphous magnetic alloy having a predetermined shape as said core element, said alloy having a Curie temperature Tc(°K.) which is lower than its crystallization temperature Tcry(°K.), said alloy containing between 70 to 78 atomic % of Co, Fe, and Ni, and 22 to 30 atomic % of at least one of the glass forming elements Si, B, P, C, and Ge, (b) keeping said alloy at a first temperature T 1 (°K.) satisfying the relation 0.9×Tc(°K.)≦T 1 (°K.)<Tcry(°K.), (c) quenching said alloy from said first temperature T 1 (°K.), and (d) annealing said alloy at a second temperature T 2 between 100° and 250° C. in the absence of an applied magnetic field.
Claim 5
Dependent Claim
30 words
A method according to claim 1, wherein said alloy in represented by the formula (fe 1-x Co x ) 100-z (Si 1-y B y ) z where 0.90≦x≦0.98, 0.30≦y≦0.80, 22≦z≦30.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein said first temperature T 1 (°K.) satisfies the formula 0.97>Tc(°K.)≦T 1 (°K.)≦0.98×Tcry(°K.).
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said second temperature T 2 is between 180° and 240° C.
Claim 8
Dependent Claim
22 words
A method according to claim 1, wherein said quenching is carried out at a cooling rate of not less than 100° C./sec.
Claim 9
Dependent Claim
22 words
A method according to claim 6, wherein said quenching is carried out at a cooling rate of not less than 500° C./sec.
References Cited (Backward Citations)
US4056411A
Cited
US4187128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |