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US4439253A
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US
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Cobalt rich manganese containing near-zero magnetostrictive metallic glasses having high saturation induction
Assignee: Honeywell International Inc
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Filing: 1982-03-04
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Granted: 1984-03-27
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Expires: 2002-03-04
Abstract
Abstract A cobalt based, manganese-containing glassy metal alloy is provided. The alloy has a combination of near-zero magnetostriction (+5 ppm to -1 ppm), high permeability (greater than 5,000) and high saturation induction (about 1.09 T or greater). The alloy has a composition described by the formula [CoaFe1-a]100-(b+c) MnbBc-dSid, where "a" ranges from about 0.90 to 0.99, "b" ranges from about 2 to 6 atom percent, "c" ranges from about 14 to 20 atom percent and "d" ranges from zero to about 7 atom percent, with the proviso that the minimum B present is 10 atom percent. The alloys of the invention find use in magnetic recording heads, switching power supplies, special magnetic amplifiers and the like.
Inventors
- 👤 V. R. V. Ramanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:56
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
128 words
A magnetic alloy which is at least about 70% glassy, has a combination of near-zero magnetostriction ranging from about -1 ppm to +5 ppm, high permeability of at least about 5,000, when measured with a driving field of 1 kHz frequency that produces an induction level of 0.01 T, and high saturation induction of at least about 1.09 T, and which is described by the formula [Co a Fe 1-a ] 100- (b+c) Mn b B c-d Si d , where "a" ranges from about 0.90 to 0.99, "b" ranges from about 2 to 6 atom percent, "c" ranges from about 14 to 20 atom percent and "d" ranges from about 0 to 7 atom percent with the proviso that the minimum B present is 10 atom percent.
Claim 2
Dependent Claim
128 words
A magnetic alloy which is at least about 70% glassy, has a combination of near-zero magnetostriction ranging from about -1 ppm to +5 ppm, high permeability of at least about 5,000, when measured with a driving field of 1 kHz frequency that produces an induction level of 0.01 T, and high saturation induction of at least about 1.09 T, and which is described by the formula [Co a Fe 1-a ] 100- (b+c) Mn b B c-d Si d , where "a" ranges from about 0.90 to 0.99, "b" ranges from about 2 to 6 atom percent, "c" ranges from about 14 to 20 atom percent and "d" ranges from about 0 to 7 atom percent with the proviso that the minimum B present is 10 atom percent.
Claim 3
Dependent Claim
16 words
The magnetic alloy of claim 1, wherein "c" ranges from about 14 to 18 atom percent.
Claim 4
Dependent Claim
26 words
The magnetic alloy of claim 1, wherein "c" ranges from about 16 to 18 atom percent and "d" ranges from zero to about 5 atom percent.
Claim 5
Dependent Claim
14 words
The magnetic alloy of claim 1, wherein "a" ranges from about 0.96 to 0.99.
Claim 6
Dependent Claim
14 words
The magnetic alloy of claim 4, wherein "a" ranges from about 0.97 to 0.98.
Claim 7
Dependent Claim
35 words
The magnetic alloy of claim 4, wherein "b" ranges from about 3 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 atom percent.
Claim 8
Dependent Claim
35 words
The magnetic alloy of claim 5, wherein "b" ranges from about 3 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 atom percent.
Claim 9
Dependent Claim
26 words
The magnetic alloy of claim 1, wherein at least one of elements Co and Fe is replaced in part by up to 8.4 atom percent nickel.
Claim 10
Dependent Claim
20 words
The magnetic alloy of claim 8, wherein the elements cobalt, iron and nickel are present in the ratio of 0.80:0.10:0.10.
Claim 11
Dependent Claim
66 words
The magnetic alloy of claim 9, described by the formula [Co 0 .80 Fe 0 .10 Ni 0 .10 ] x Mn y B z-w Si w , where "x" ranges from about 78 to 84 atom percent, "y" ranges from about 2 to 5 atom percent, "z" ranges from about 14 to 18 atom percent and "w" ranges from zero to about 5 atom percent.
Claim 12
Dependent Claim
38 words
The magnetic alloy of claim 1, wherein up to 1 atom percent of one of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ru, Pd, Cu, Zn, Al, Ge, Sn, Pb, and Bi are present.
Claim 13
Dependent Claim
14 words
The magnetic alloy of claim 11, wherein "a" ranges from about 0.96 to 0.99.
Claim 14
Dependent Claim
14 words
The magnetic alloy of claim 12, wherein "a" ranges from about 0.97 to 0.98.
Claim 15
Dependent Claim
35 words
The magnetic alloy of claim 12, wherein "b" ranges from about 3 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 atom percent.
Claim 16
Dependent Claim
35 words
The magnetic alloy of claim 13, wherein "b" ranges from about 35 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 atom percent.
Claim 17
Dependent Claim
16 words
The magnetic alloy of claim 1, wherein up to 2 atom percent of C is present.
Claim 18
Dependent Claim
14 words
The magnetic alloy of claim 16, wherein "a" ranges from about 0.96 to 0.99.
Claim 19
Dependent Claim
14 words
The magnetic alloy of claim 17, wherein "a" ranges from about 0.97 to 0.98.
Claim 20
Dependent Claim
35 words
The magnetic alloy of claim 17, wherein "b" ranges from about 3 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 atom percent.
Claim 21
Dependent Claim
34 words
The magnetic alloy of claim 18, wherein "b" ranges from about 3 to 5 atom percent, "c" ranges from about 16 to 18 atom percent and "d" ranges from about 2 to 6 percent.
Claim 22
Dependent Claim
24 words
The magnetic alloy of claim 7, having the formula [Co 0 .97 Fe 0 .03 ] 78 Mn 4 B 13 Si 5 .
Claim 23
Dependent Claim
24 words
The magnetic alloy of claim 7, having the formula [Co 0 .97 Fe 0 .03 ] 78 Mn 4 B 12 Si 6 .
Claim 24
Dependent Claim
24 words
The magnetic alloy of claim 7, having the formula [Co 0 .98 Fe 0 .02 ] 78 Mn 4 B 13 Si 5 .
Claim 25
Dependent Claim
24 words
The magnetic alloy of claim 7, having the formula [Co 0 .98 Fe 0 .02 ] 78 Mn 4 B 12 Si 6 .
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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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |