US4525222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat-treating amorphous material
Assignee: Proterial Ltd
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Filing: 1984-05-14
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Granted: 1985-06-25
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Expires: 2004-05-14
Abstract
Abstract A method of heat-treating an amorphous material as that the amorphous material has a high magnetic permeability, is disclosed in which an amorphous material having a Curie temperature T c higher than or equal to its crystallization temperature T x is held for a short time at a temperature T satisfying relations T≧0.95 T c and T≧T x .
Inventors
- 👤 Takashi Meguro
- 👤 Yasunobu Ogata
- 👤 Yoshizo Sawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:13
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; C; C22; C22C; C22C45/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A method of heat-treating a Co-base amorphous material having a Curie temperature T c higher than or equal to the crystallization temperature T x of said material, comprising a step of holding the amorphous material at a temperature T defined by the following formulae: 1.1×T.sub.c ≧T≧0.95×T.sub.c and T≧T.sub.x for a short time ranging from about 30 seconds to about 3 minutes to enhance the magnetic permeability and to prevent crystallization of said material.
Claim 2
Independent Claim
73 words
A method of heat-treating a Co-base amorphous material having a Curie temperature T c higher than or equal to the crystallization temperature T x of said material, comprising a step of holding the amorphous material at a temperature T defined by the following formulae: 1.1×T.sub.c ≧T≧0.95×T.sub.c and T≧T.sub.x for a short time ranging from about 30 seconds to about 3 minutes to enhance the magnetic permeability and to prevent crystallization of said material.
Claim 3
Dependent Claim
94 words
A method of heat treating an amorphous material according to claim 1, where in said amorphous material is (Co 0 .94 Fe 0 .06) 75 .3 Si 4 .7 B 20 having a crystallization temperature T x of 490° C. and a Curie temperature T c of 510° C. and wherein said amorphous material is held at a temperature in the range of from 490° C. to 560° C. for a period ranging from 1 to 3 minutes and, thereafter, cooled with water at a cooling rate of more than 10 2 ° C./sec.
Claim 4
Independent Claim
102 words
A method of heat-treating an amorphous material, ((Co 0 .918 Fe 0 .005 Mn 0 .077) 78 .3 B 9 ) 99 .5 Ru 0 .5, to enhance the magnetic permeability and to prevent crystallization of said amorphous material, said amorphous material having a crystallization temperature Tx of 420° C. and a Curie temperature Tc of 420°, which method comprises holding said amorphous material at a temperature ranging from 430° C. to 470° C. to for a period of time ranging from 1 to 2 minutes, followed by cooling with water at a cooling rate of more than 10 2 ° C./sec.
Claim 5
Independent Claim
102 words
A method of heat-treating an amorphous material, ((Co 0 .918 Fe 0 .005 Mn 0 .077) 78 .3 B 9 ) 99 .5 Ru 0 .5, to enhance the magnetic permeability and to prevent crystallization of said amorphous material, said amorphous material having a crystallization temperature Tx of 420° C. and a Curie temperature Tc of 420°, which method comprises holding said amorphous material at a temperature ranging from 430° C. to 470° C. to for a period of time ranging from 1 to 2 minutes, followed by cooling with water at a cooling rate of more than 10 2 ° C./sec.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |