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US4765848A
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Permanent magnent and method for producing same
Assignee: TDK Corp
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Filing: 1985-12-27
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Granted: 1988-08-23
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Expires: 2005-12-27
Abstract
Abstract In the rare earth-iron-boron permanent magnet, Ce and La decrease the magnetic properties when used alone but synergistically enhance iHc when used in combination. The composition provided by the present invention is generally expressed by [(Ce x La 1-x ) y R 1-y ] z [(Fe 1-u-w Co w M u ) 1-v B v ] 1-z with a proviso of 0.4≦x≦0.9, 0.2<y≦1.0, 0.05≦z≦0.3, 0.01≦v≦0.3, 0≦u≦0.2, 0≦w≦0.5, and M is at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag.
Inventors
- 👤 Kaneo Mohri
- 👤 Jiro Yamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:02
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0577
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
40 words
A permanent magnet having a composition expressed by (Ce x La 1-x ) z (Fe 1-v B v ) 1-z , with a proviso of 0.4≦x≦0.9, 0.05≦z≦0.3, and 0.01≦v≦0.3 and having a coercive force (iHc) of at least 4 kOe.
Claim 2
Dependent Claim
40 words
A permanent magnet having a composition expressed by (Ce x La 1-x ) z (Fe 1-v B v ) 1-z , with a proviso of 0.4≦x≦0.9, 0.05≦z≦0.3, and 0.01≦v≦0.3 and having a coercive force (iHc) of at least 4 kOe.
Claim 3
Dependent Claim
15 words
A permanent magnet according to claim 1, wherein said permanent magnet is a sintered magnet.
Claim 4
Dependent Claim
15 words
A permanent magnet according to claim 1, wherein said permanent magnet is a bonded magnet.
Claim 5
Dependent Claim
27 words
A permanent magnet according to claim 1, wherein x is from 0.6 to 0.8, v is from 0.02 to 0.15, and z is from 0.1 to 0.2.
Claim 6
Dependent Claim
14 words
A permanent magnet according to claim 2, wherein v is from 0.03 to 0.12.
Claim 7
Dependent Claim
12 words
A permanent magnet according to claim 2, wherein x is approximately 0.65.
Claim 8
Dependent Claim
65 words
A permanent magnet according to claim 1, 2, 3, 4, 5, or 6, wherein at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag is contained at an atomic ratio of 0.2 or less based on the sum of said at least one element and Fe.
Claim 9
Dependent Claim
56 words
A permanent magnet according to claim 1, 2, 3, 4, 5, or 6, wherein B is partly replaced with at least one element selected from the group consisting of Si, C, P, N, Ge, and S in an atomic ratio of 0.5 or less based on a sum of B and said at least one element.
Claim 10
Dependent Claim
86 words
A permanent magnet according to claim 1, wherein Co is contained at an atomic ratio (w) and at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag is contained at an atomic ratio (u), wherein said (w) is from more than 0 to 0.5 and said (u) is from 0 to 0.2, with the proviso that sum of (u), (w) and atomic ratio of Fe is 1.0.
Claim 11
Dependent Claim
15 words
A permanent magnet according to claim 9, wherein said permanent magnet is a sintered magnet.
Claim 12
Dependent Claim
15 words
A permanent magnet according to claim 9, wherein said permanent magnet is a bonded magnet.
Claim 13
Dependent Claim
27 words
A permanent magnet according to claim 9, wherein x is from 0.6 to 0.8, v is from 0.02 to 0.15, and z is from 0.1 to 0.2.
Claim 14
Dependent Claim
14 words
A permanent magnet according to claim 10, wherein v is from 0.03 to 0.12.
Claim 15
Dependent Claim
12 words
A permanent magnet according to claim 10, wherein x is approximately 0.65.
Claim 16
Dependent Claim
60 words
A permanent magnet having a composition of [(Ce x La 1-x ) y R 1-y ] z (Fe 1-v B v ) 1-z , wherein R is at least one rare earth element except for Ce and La, but including Y with a proviso of 0.4≦x≦0.9, 0.2<y<1.0, 0.05≦z≦0.3, 0.01≦v≦0.3, and having a coercive force (iHc) of at least 4 kOe.
Claim 17
Dependent Claim
60 words
A permanent magnet having a composition of [(Ce x La 1-x ) y R 1-y ] z (Fe 1-v B v ) 1-z , wherein R is at least one rare earth element except for Ce and La, but including Y with a proviso of 0.4≦x≦0.9, 0.2<y<1.0, 0.05≦z≦0.3, 0.01≦v≦0.3, and having a coercive force (iHc) of at least 4 kOe.
Claim 18
Dependent Claim
15 words
A permanent magnet according to claim 15, wherein said permanent magnet is a sintered magnet.
Claim 19
Dependent Claim
15 words
A permanent magnet according to claim 15, wherein said permanent magnet is a bonded magnet.
Claim 20
Dependent Claim
27 words
A permanent magnet according to claim 15, wherein x is from 0.6 to 0.8, v is from 0.02 to 0.15, and z is from 0.1 to 0.2.
Claim 21
Dependent Claim
14 words
A permanent magnet according to claim 18, wherein v is from 0.03 to 0.12.
Claim 22
Dependent Claim
12 words
A permanent magnet according to claim 19, wherein x is approximately 0.65.
Claim 23
Dependent Claim
65 words
A permanent magnet according to claim 15, 16, 17, 18, 19, or 20, wherein at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag is contained at an atomic ratio of 0.2 or less based on the sum of said at least one element and Fe.
Claim 24
Dependent Claim
56 words
A permanent magnet according to claim 15, 16, 17, 18, 19 or 20, wherein B is partly replaced with at least one element selected from the group consisting of Si, C, P, N, Ge, and S in an atomic ratio of 0.5 or less based on a sum of B and said at least one element.
Claim 25
Dependent Claim
86 words
A permanent magnet according to claim 15, wherein Co is contained at an atomic ratio (w) and at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag is contained at an atomic ratio (u), wherein said (w) is from more than 0 to 0.5 and said (u) is from 0 to 0.2, with the proviso that sum of (u), (w) and atomic ratio of Fe is 1.0.
Claim 26
Dependent Claim
15 words
A permanent magnet according to claim 23, wherein said permanent magnet is a sintered magnet.
Claim 27
Dependent Claim
15 words
A permanent magnet according to claim 23, wherein said permanent magnet is a bonded magnet.
Claim 28
Dependent Claim
27 words
A permanent magnet according to claim 23, wherein x is from 0.6 to 0.8, v is from 0.02 to 0.15, and z is from 0.1 to 0.2.
Claim 29
Dependent Claim
14 words
A permanent magnet according to claim 26, wherein v is from 0.03 to 0.12.
Claim 30
Dependent Claim
12 words
A permanent magnet according to claim 26, wherein x is approximately 0.65.
Claim 31
Dependent Claim
85 words
A permanent magnet having a composition of [(Ce x La 1-x ) y R 1-y ] z [(Fe 1-u-w Co w M u ) 1-v B v ] 1-z with a proviso of 0.4≦x≦0.9, 0.2<y≦1.0, 0.05≦z≦0.3, 0.01≦v≦0.3, 0≦u≦0.2, 0≦w≦0.5, and M is at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag, having a coercive force (iHc) of at least 4 kOe, having been plastically worked.
Claim 32
Dependent Claim
85 words
A permanent magnet having a composition of [(Ce x La 1-x ) y R 1-y ] z [(Fe 1-u-w Co w M u ) 1-v B v ] 1-z with a proviso of 0.4≦x≦0.9, 0.2<y≦1.0, 0.05≦z≦0.3, 0.01≦v≦0.3, 0≦u≦0.2, 0≦w≦0.5, and M is at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag, having a coercive force (iHc) of at least 4 kOe, having been plastically worked.
Claim 33
Dependent Claim
27 words
A permanent magnet according to claim 29, wherein the plastic working method is a method selected from the group consisting of hot-pressing, swaging, extruding, forging, and rolling.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |