US5067993A
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Magnetic core material made of fe-co base alloy for high frequencies
Assignee: Mitsubishi Materials Corp
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Filing: 1988-08-18
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Granted: 1991-11-26
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Expires: 2008-08-18
Abstract
Abstract A magnetic core material made of a Fe-Co base alloy for use at high frequencies, and has excellent high-frequency alternating magnetic properties. The core material composition is Co: 45-53% by weight, C: 0.3-3% by weight, one or both of Mn and Si: 0.1-2% by weight, at least one of Mg, Ca, and Ce: 0.1-0.2% by weight, and the remainder Fe and unavoidable impurities. The structure of the alloy comprises a ferrite matrix containing graphite in an amount of from 1-20% by volume dispersed therein. The material is applied, for example, in a dot impact printer and to a pulse motor.
Inventors
- 👤 Saburo Wakita
- 👤 Kiyoshi Yamaguchi
- 👤 Norio Yanagisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:29
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; C; C22; C22C; C22C38/00; C22C38/10; H02; H02K; H02K1/00; H02K1/02
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
78 words
A Fe-Co alloy magnetic core material for use with high frequency signals comprising 45 to 53% by weight of Co, 0.3 to 3% by weight of C, a total of 0.1 to 2% by weight of at least one selected from the group consisting of Mn and Si, and the balance Fe and unavoidable impurities, the structure of said alloy comprising a ferrite matrix containing graphite in an amount of from 1 to 20% by volume dispersed therein.
Claim 2
Dependent Claim
78 words
A Fe-Co alloy magnetic core material for use with high frequency signals comprising 45 to 53% by weight of Co, 0.3 to 3% by weight of C, a total of 0.1 to 2% by weight of at least one selected from the group consisting of Mn and Si, and the balance Fe and unavoidable impurities, the structure of said alloy comprising a ferrite matrix containing graphite in an amount of from 1 to 20% by volume dispersed therein.
Claim 3
Dependent Claim
19 words
The magnetic core material of claim 1, wherein said Fe-Co alloy contains 0.5 to 1.5% by weight of C.
Claim 4
Dependent Claim
23 words
The magnetic core material of claim 1, wherein said graphite is spheroidal graphite having a mean diameter of from 0.5 to 50 μm.
Claim 5
Dependent Claim
23 words
The magnetic core material of claim 1, wherein said graphite is spheroidal graphite having a mean diameter of from 2 to 4 μm.
Claim 6
Dependent Claim
23 words
The magnetic core material of claim 2, wherein said graphite is spheroidal graphite having a mean diameter of from 2 to 4 μm.
Claim 7
Dependent Claim
101 words
A Fe-Co alloy magnetic core material for use with high frequency signals comprising 45 to 53% by weight of Co, 0.3 to 3% by weight of C, a total of 0.1 to 2% by weight of at least one selected from the group consisting of Mn and Si, a total of 0.01 to 0.2% by weight of at least one selected from the group consisting of Mg, Ca and Ce, and the balance Fe and unavoidable impurities, the structure of said alloy comprising a ferrite matrix containing spheroidal graphite in an amount of from 1 to 20% by volume dispersed therein.
Claim 8
Dependent Claim
101 words
A Fe-Co alloy magnetic core material for use with high frequency signals comprising 45 to 53% by weight of Co, 0.3 to 3% by weight of C, a total of 0.1 to 2% by weight of at least one selected from the group consisting of Mn and Si, a total of 0.01 to 0.2% by weight of at least one selected from the group consisting of Mg, Ca and Ce, and the balance Fe and unavoidable impurities, the structure of said alloy comprising a ferrite matrix containing spheroidal graphite in an amount of from 1 to 20% by volume dispersed therein.
Claim 9
Dependent Claim
19 words
The magnetic core material of claim 6, wherein said Fe-Co alloy contains 0.5 to 1.5% by weight of C.
Claim 10
Dependent Claim
21 words
The magnetic core material of claim 6, wherein said spheroidal graphite having a mean diameter of from 0.5 to 50 μm.
Claim 11
Dependent Claim
21 words
The magnetic core material of claim 6, wherein said spheroidal graphite having a mean diameter of from 2 to 4 μm.
Claim 12
Dependent Claim
21 words
The magnetic core material of claim 7, wherein said spheroidal graphite having a mean diameter of from 2 to 4 μm.
Claim 13
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 45.5% Co, 1.00% C, 0.65% Mn and a trace amount of Mg.
Claim 14
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 49.2% Co, 0.93% C, 0.74% Mn and a trace amount of Mg.
Claim 15
Dependent Claim
20 words
The magnetic core material of claim 6, which contains 52.7% Co, 1.11% C, 0.72% Mn and trace amount of Mg.
Claim 16
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 49.4% Co, 0.34% C, 0.76% Mn and a trace amount of Ca.
Claim 17
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 49.0% Co, 0.65% C, 0.80% Mn and a trace amount of Ce.
Claim 18
Dependent Claim
16 words
The magnetic core material of claim 1, which contains 48.6% Co, 1.04% C and 0.75% Mn.
Claim 19
Dependent Claim
20 words
The magnetic core material of claim 6, which contains 49.3%, 2.12% C, 0.72% Mn and a trace amount of Mg.
Claim 20
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 48.7% Co, 2.88% C, 0.75% Mn and a trace amount of Mg.
Claim 21
Dependent Claim
16 words
The magnetic core material of claim 1, which contains 49.1% Co, 0.86% C and 0.12% Mn.
Claim 22
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 49.2% Co, 0.93% C, 1.88% Mn and a trace amount of Ce.
Claim 23
Dependent Claim
21 words
The magnetic core material of claim 6, which contains 48.7% Co, 1.01% C, 0.58% Si and a trace amount of Mg.
Claim 24
Dependent Claim
23 words
The magnetic core material of claim 6, which contains 49.0% Co, 1.12% C, 0.70% Mn, 0.32% Si and a trace amount of Mg.
Claim 25
Dependent Claim
18 words
The magnetic core material of claim 6, which contains 48.4% Co, 0.97% C, 0.78% Mn and 0.02% Mg.
Claim 26
Dependent Claim
18 words
The magnetic core material of claim 6, which contains 49.1% Co, 0.90% C, 0.74% Mn and 0.08% Ca.
Claim 27
Dependent Claim
18 words
The magnetic core material of claim 6, which contains 48.3% Co, 0.92% C, 0.75% Mn and 0.18% Ce.
Claim 28
Dependent Claim
20 words
The magnetic core material of claim 6, which contains 48.6% Co, 0.96% C, 0.64% Si, 0.06% Mg and 0.02% Ca.
Claim 29
Dependent Claim
24 words
The magnetic core material of claim 6, which contains 49.0% Co, 1.01% C, 0.60% Mn, 0.55% Si, 0.04% Mg, 0.02% Ca and 0.03% Ce.
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JPS53108824A
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JPS62227064A
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JPS6311650A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |