US4484957A
Expired / Lapsed
US
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Permanent magnetic alloy
Assignee: Proterial Ltd
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Filing: 1982-08-25
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Granted: 1984-11-27
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Expires: 2002-08-25
Abstract
Abstract A permanent magnetic alloy comprising of an intermetallic compound of rare earth elements and transition metals, shown by the formula: R(Ni.sub.x Fe.sub.y Co.sub.1-x-y-z Cu.sub.z).sub.A wherein R is at least one selected from the lanthanide light rare earth elements including Y, such as Y, La, Ce, Pr, Nd and Sm, and 0.02≦x≦0.55 x/y=0.07-25.0 0.01≦y≦0.65 0.02≦z≦0.30 6.0<A<8.0 Preferably, the Ni and Fe are incorporated in substantially equimolar amounts.
Inventors
- 👤 Akira Higuchi
- 👤 Naoyuki Ishigaki
- 👤 Yutaka Matsuura
- 👤 Hitoshi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:33
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; C; C22; C22C; C22C19/00; C22C38/00; C22C38/10; C22C38/105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
97 words
A permanent magnetic article having a maximum energy product of 20 MGOe or higher and produced by aging a sintered permanent magnetic body at a temperature of 750°- 850° C., the sintered permanent magnetic body consisting essentially of an intermetallic compound shown by the formula: R(Ni.sub.x Fe.sub.y Co.sub.1-x-y-z Cu.sub.z).sub.A wherein R is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd and Sm, and 0.02≦x≦0.55 x/y=0.07-25.0 0.01≦y≦0.65 0.02≦z≦0.30 x+y+z<1 6.0<A<8.0 and having a crystal structure substantially of the TbCu 7 type with a Curie point of no less than 800° C.
Claim 2
Dependent Claim
97 words
A permanent magnetic article having a maximum energy product of 20 MGOe or higher and produced by aging a sintered permanent magnetic body at a temperature of 750°- 850° C., the sintered permanent magnetic body consisting essentially of an intermetallic compound shown by the formula: R(Ni.sub.x Fe.sub.y Co.sub.1-x-y-z Cu.sub.z).sub.A wherein R is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd and Sm, and 0.02≦x≦0.55 x/y=0.07-25.0 0.01≦y≦0.65 0.02≦z≦0.30 x+y+z<1 6.0<A<8.0 and having a crystal structure substantially of the TbCu 7 type with a Curie point of no less than 800° C.
Claim 3
Dependent Claim
13 words
A sintered permanent magnetic body defined in claim 1, in which: 0.02≦x≦0.40 0.01≦y≦0.40.
Claim 4
Dependent Claim
13 words
A sintered permanent magnetic body as defined in claim 2, in which: 6.2≦A<8.0.
Claim 5
Dependent Claim
13 words
A sintered permanent magnetic body as defined in claim 2, in which: 6.5≦A<7.5.
Claim 6
Dependent Claim
27 words
A sintered permanent magnetic body as defined in claim 3, in which Ni and Fe are incorporated in an x/y ratio of about from 0.07 to 1.25.
Claim 7
Dependent Claim
19 words
A sintered permanent magnetic body as defined in claim 1, in which R is Sm or a Sm alloy.
Claim 8
Dependent Claim
19 words
A sintered permanent magnetic body as defined in claim 1, in which R is Y or a Y alloy.
Claim 9
Dependent Claim
29 words
A sintered permanent magnetic body as defined in claim 1, in which R is an alloy of Sm with at least one of Y, La, Ce, Pr and Nd.
Claim 10
Dependent Claim
27 words
A sintered permanent magnetic body as defined in claim 1, in which R is an alloy of Sm with at least one of Ce, Pr and Y.
Claim 11
Dependent Claim
21 words
A sintered permanent magnetic body as defined in claim 1, in which the molar ratio for Co(1-x-y-z) is 0.01 or more.
Claim 12
Dependent Claim
21 words
A sintered permanent magnetic body as defined in claim 1, in which the molar ratio for Co(1-x-y-z) is 0.03 or more.
Claim 13
Dependent Claim
24 words
A sintered permanent magnetic body as defined in any one of claims 1-5, in which the molar ratio for Co(1-x-y-z) is 0.2 or more.
Claim 14
Dependent Claim
19 words
A permanent magnetic article as defined in claim 1 having a maximum energy product of at least 22.5 MGOe.
Claim 15
Dependent Claim
115 words
A sintered permanent magnetic body consisting essentially of an intermetallic compound shown by the formula: R(Ni.sub.x Fe.sub.y Co.sub.1-x-y-z Cu.sub.z).sub.A wherein R is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd and Sm, and 0.02≦x≦0.55 x/y=0.07-25.0 0.01≦y≦0.65 0.02≦z≦0.30 x+y+z<1 6.0<A<8.0 and having a crystal structure substantially of the TbCu 7 type with a Curie point of no less than 800° C., wherein 0.001-0.2 mole of the transition metals of Ni, Fe, Co and Cu per mole of the total molar amount of Ni, Fe, Co and Cu in said formula is substituted by at least one substitute element selected from the group consisting of Mn, W, Ta and Hf.
Claim 16
Dependent Claim
115 words
A sintered permanent magnetic body consisting essentially of an intermetallic compound shown by the formula: R(Ni.sub.x Fe.sub.y Co.sub.1-x-y-z Cu.sub.z).sub.A wherein R is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd and Sm, and 0.02≦x≦0.55 x/y=0.07-25.0 0.01≦y≦0.65 0.02≦z≦0.30 x+y+z<1 6.0<A<8.0 and having a crystal structure substantially of the TbCu 7 type with a Curie point of no less than 800° C., wherein 0.001-0.2 mole of the transition metals of Ni, Fe, Co and Cu per mole of the total molar amount of Ni, Fe, Co and Cu in said formula is substituted by at least one substitute element selected from the group consisting of Mn, W, Ta and Hf.
Claim 17
Dependent Claim
29 words
A sintered permanent magnetic body as defined in claim 14, in which said substitute element is at least one selected from the group consisting of Mn, Ta, and Hf.
Claim 18
Dependent Claim
28 words
A sintered permanent magnetic body as defined in claim 15, in which said substitute element is at least one selected from the group consisting of Mn, and Hf.
Claim 19
Dependent Claim
23 words
A permanent magnetic article produced by aging the sintered permanent magnetic body as defined in claim 14 at a temperature of 750°-850° C.
Claim 20
Dependent Claim
19 words
A permanent magnetic article as defined in claim 17 having a maximum energy product of at least 20 MGOe.
Claim 21
Dependent Claim
19 words
A permanent magnetic article as defined in claim 17 having a maximum energy product of at least 22.5 MGOe.
References Cited (Backward Citations)
US3421889A
Cited
US3839102A
Cited
GB1266787A
Cited
US3560200A
Cited
US3558371A
Cited
US3615911A
Cited
JPS4920020A
Cited
JPS4913132A
Cited
US3947295A
Cited
US3950194A
Cited
US3982971A
Cited
US4099995A
Cited
US3998669A
Cited
US4082582A
Cited
US4116726A
Cited
GB1564924A
Cited
US4279668A
Cited
US4208225A
Cited
US4047982A
Cited
US4081297A
Cited
US4135953A
Cited
US4121952A
Cited
US4131495A
Cited
GB1532185A
Cited
US4284440A
Cited
US4121924A
Cited
US4222770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |