US3947295A
Expired / Lapsed
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Hard magnetic material
Assignee: Panasonic Holdings Corp
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Filing: 1974-02-07
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Granted: 1976-03-30
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Expires: 1994-02-07
Abstract
Abstract Bulk hardened magnetic materials with compositions expressed by a general formula SmuCe1-u(Co1-x-yFexCuy)z are provided. Compositions in the limited range of 0.3</=u</=1.0, 0</=x</=0.1, 0.09</=y</=0.18, 6.0</=z</=7.5 lead to magnetic materials with unexpectedly large maximum energy product and with a newly found two phase structure. Magnetic materials with maximum energy product of over 13 MG.Oe (megagauss) oersted), residual induction over 7000 G and intrinsic coercive force over 3000 Oe are obtained by subjecting the compositions to a sintering process.
Inventors
- 👤 Yoshio Tawara
- 👤 Harufumi Senno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:51
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0557
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A magnetic material consisting essentially of a composition expressed by the formula Sm u Ce 1 -u (Co 1 -x -y Fe x Cu y ) z where 0.3≦u≦1.0, 0≦x≦0.1, 0.09≦y≦0.18 and 6.0≦z≦ 7.5, and having a residual induction of more than 7000G, an intrinsic coercive force of more than 3000 Oe and a maximum energy product of more than 13 Mg.Oe.
Claim 2
Dependent Claim
62 words
A magnetic material consisting essentially of a composition expressed by the formula Sm u Ce 1 -u (Co 1 -x -y Fe x Cu y ) z where 0.3≦u≦1.0, 0≦x≦0.1, 0.09≦y≦0.18 and 6.0≦z≦ 7.5, and having a residual induction of more than 7000G, an intrinsic coercive force of more than 3000 Oe and a maximum energy product of more than 13 Mg.Oe.
Claim 3
Dependent Claim
27 words
A magnetic material as claimed in claim 1, wherein said material consists of two phases, both of which are of the CaCu 5 type hexagonal crystal structure.
Claim 4
Independent Claim
130 words
A method of manufacturing the magnetic material consisting essentially of a composition expressed by the formula Sm u Ce 1 -u (Co 1 -x -y Fe x Cu y ) z where 0.3≦u≦1.0, 0≦x≦0.1, 0.09≦y≦0.18 and 6.0≦z≦7.5, and having a residual induction of more than 7000G, an intrinsic coercive force of more than 3000 Oe and a maximum energy product of more than 13 MG.Oe, comprising, in the following recited order, preparing a raw material consisting essentially of said composition, pressing said raw material into a green body under a magnetic field sufficient to cause easy axis alignment thereof, sintering said green body into a sintered body, cooling rapidly said sintered body, and heating the thus cooled sintered body at a temperature lower than a temperature used in said sintering.
Claim 5
Independent Claim
130 words
A method of manufacturing the magnetic material consisting essentially of a composition expressed by the formula Sm u Ce 1 -u (Co 1 -x -y Fe x Cu y ) z where 0.3≦u≦1.0, 0≦x≦0.1, 0.09≦y≦0.18 and 6.0≦z≦7.5, and having a residual induction of more than 7000G, an intrinsic coercive force of more than 3000 Oe and a maximum energy product of more than 13 MG.Oe, comprising, in the following recited order, preparing a raw material consisting essentially of said composition, pressing said raw material into a green body under a magnetic field sufficient to cause easy axis alignment thereof, sintering said green body into a sintered body, cooling rapidly said sintered body, and heating the thus cooled sintered body at a temperature lower than a temperature used in said sintering.
Claim 6
Dependent Claim
29 words
A method of manufacturing the magnetic material of claim 3, wherein said material consists of two phases, both of which are of the CaCu 5 type hexagonal crystal structure.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |