US4743313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous alloy for use in magnetic heads
Assignee: Alps Alpine Co Ltd
•
Filing: 1985-11-12
•
Granted: 1988-05-10
•
Expires: 2005-11-12
Abstract
Abstract An amorphous alloy for use in magnetic heads having the following composition formula: (Fe1-a, Coa)100-b(Sic,Bd)b where a=0.93-0.95 b=23-27 atomic % c/c+d)=0.55-0.65. Cr and Ru may be desirably added to the amorphous alloy for improving the corrosion and abrasion resistance. Further, secondary phase particles may be dispersed in the alloy matrix for improving the effective magnetic permeability, particularly, at high frequency region.
Inventors
- 👤 Akihiro Makino
- 👤 Mikio Nakashima
- 👤 Tadashi Sasaki
- 👤 Koichi Mukasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/02; C22C45/04; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15316
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
An amorphous alloy for use in magnetic heads, wherein 1.0-2.0 atm% Cr and an amount up to 4.0 atm% Ru are added to an alloy having the following composition formula: (Fe.sub.1-a, Co.sub.a).sub.100-b (Si.sub.c,B.sub.d).sub.b where a=0.93-0.95 b=23-27 atomic % c/(c+d)=0.55-0.65.
Claim 2
Dependent Claim
39 words
An amorphous alloy for use in magnetic heads, wherein 1.0-2.0 atm% Cr and an amount up to 4.0 atm% Ru are added to an alloy having the following composition formula: (Fe.sub.1-a, Co.sub.a).sub.100-b (Si.sub.c,B.sub.d).sub.b where a=0.93-0.95 b=23-27 atomic % c/(c+d)=0.55-0.65.
Claim 3
Dependent Claim
46 words
An amorphous alloy for use in magnetic heads, wherein second phase particles are dispersed in an alloy matrix in which 1.0-2.0 atm% Cr and 0-4.0 atm% Ru are added in an alloy having the following composition formula: (Fe.sub.1-a, Co.sub.a).sub.100-b (Si.sub.c,B.sub.d).sub.b where a=0.93-0.95 b=23-27 atomic % c/(c+d)=0.55-0.65.
Claim 4
Dependent Claim
46 words
An amorphous alloy for use in magnetic heads, wherein second phase particles are dispersed in an alloy matrix in which 1.0-2.0 atm% Cr and 0-4.0 atm% Ru are added in an alloy having the following composition formula: (Fe.sub.1-a, Co.sub.a).sub.100-b (Si.sub.c,B.sub.d).sub.b where a=0.93-0.95 b=23-27 atomic % c/(c+d)=0.55-0.65.
Claim 5
Dependent Claim
28 words
The amorphous alloy for use in magnetic heads as defined in claim 2, wherein the second phase particles are added within a range from 0.5 to 3.0 vol%.
Claim 6
Dependent Claim
24 words
The amorphous alloy for use in magnetic heads as defined in claim 2, wherein the secondary phase particles comprise Al 2 O 3 particles.
Claim 7
Dependent Claim
24 words
The amorphous alloy for use in magnetic heads as defined in claim 3 wherein the secondary phase particles comprise Al 2 O 3 particles.
References Cited (Backward Citations)
US3856513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |