US4950337A
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Magnetic and mechanical properties of amorphous alloys by pulse high current
Assignee: CHEN-MIN LI JAMES
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Filing: 1989-04-14
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Granted: 1990-08-21
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Expires: 2009-04-14
Abstract
Abstract A heating process of improving the magnetic and mechanical properties of ferromagnetic amorphous alloys wherein the amorphous ribbon is treated with rapid heating and rapid magnetic domain impacting in a direct heating manner by means of pulsed high current to improve the magnetism of ferromagnetic amorphous alloys with reduced or eliminated the annealing embrittlement thereof. The heating process is performed in the following conditions: pulse current density: J≧10 3 A/cm 2 pulse duration: tp=1 ns-100 ms frequency: f=1 Hz-1,000 Hz heating time: tn=1 sec.-100 secs.
Inventors
- 👤 James C. Li
- 👤 Huang Der-Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:11
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; C; C21; C21D; C21D1/00; C21D1/34; C21D1/40; C21D8/00; C21D8/12; C21D8/1244; C22; C22F; C22F1/00; C21D8/1205; C21D8/1211
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A method of improving the magnetic and mechanical properties of ferromagnetic amorphous alloys without causing annealing embrittlement, said method comprising the step of applying a pulsed high current to a ferromagnetic amorphous ribbon so as to rapidly heat the ribbon by the Joule effect, thereby relieving quenched-in stress of the amorphous ribbon.
Claim 2
Independent Claim
52 words
A method of improving the magnetic and mechanical properties of ferromagnetic amorphous alloys without causing annealing embrittlement, said method comprising the step of applying a pulsed high current to a ferromagnetic amorphous ribbon so as to rapidly heat the ribbon by the Joule effect, thereby relieving quenched-in stress of the amorphous ribbon.
Claim 3
Dependent Claim
64 words
The method of claim 1, wherein the step of applying a pulsed current includes the step of applying a dc pulsed current having a pulse current density of at least 10 3 A/cm 2 , a frequency in a range of 1-1000 Hz, a pulse duration in a range of 1 ns-100 msec and a heating time in a range of 1 sec-100 sec.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1, wherein the ferromagnetic amorphous ribbon is one of a straight specimen and a toroidal specimen.
Claim 5
Dependent Claim
68 words
A method as in claim 1, wherein the ferromagnetic amorphous alloys are made of metals selected from the group consisting of Allied 2605S2 (Fe 78 B 13 Si 9 ), Allied 2605SC (Fe 81 B 13 .5 Si 3 .5 C 2 ), Allied 2826MB (Fe 40 Ni 38 Mo 4 B 18 ), and Allied 2705MN (Co 70 Fe 2 Mn 4 B 12 Si 6 ).
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |