US4975130A
Expired / Lapsed
US
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Permanent magnet materials
Assignee: Proterial Ltd
•
Filing: 1987-05-19
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Granted: 1990-12-04
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Expires: 2007-05-19
Abstract
Abstract Permanent magnet materials of the Fe-B-R type are produced by: preparing a metallic powder having a mean particle size of 0.3-80 microns and a composition of 8-30 at % R, 2-28 at % B, and the balance Fe, compacting, and sintering, at a temperature of 900-1200 degrees C. Co up to 50 at % may be present. Additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) may be present. The process is applicable for anisotropic and isotropic magnet materials.
Inventors
- 👤 Yutaka Matsuura
- 👤 Masato Sagawa
- 👤 Setsuo Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:17
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; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-80 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, and the balance being at least 60% Fe wherein Co is substituted for Fe in an amount of more than zero and no more than 35 atomic % of the entire material provided that Fe is present in the amount of at least 40% and wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 2
Dependent Claim
137 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-80 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, and the balance being at least 60% Fe wherein Co is substituted for Fe in an amount of more than zero and no more than 35 atomic % of the entire material provided that Fe is present in the amount of at least 40% and wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 3
Dependent Claim
220 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-8 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, at least one of additional elements M in amount(s) not exceeding the values by atomic percent as specified hereinbelow provided that, when two or more elements M are added, the total amount thereof shall not exceed the largest value among said specified values of the elements actually added: ______________________________________
3.0% Ti, 6.5% Ni, 5.0% Bi,
5.3% V, 9.0% Nb, 7.0% Ta,
4.7% Cr, 5.2% Mo, 5.0% W,
6.0% Mn, 5.2% Al, 1.0% Sb,
3.5% Ge, 1.5% Sn, 3.2% Zr, and
3.2% Hf,
______________________________________ and the balance being at least 60% Fe wherein Co is substituted for Fe in an amount of more than zero and no more than 35 atomic % of the entire material provided that Fe is present in an amount of at least 40% and wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 4
Dependent Claim
220 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-8 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, at least one of additional elements M in amount(s) not exceeding the values by atomic percent as specified hereinbelow provided that, when two or more elements M are added, the total amount thereof shall not exceed the largest value among said specified values of the elements actually added: ______________________________________
3.0% Ti, 6.5% Ni, 5.0% Bi,
5.3% V, 9.0% Nb, 7.0% Ta,
4.7% Cr, 5.2% Mo, 5.0% W,
6.0% Mn, 5.2% Al, 1.0% Sb,
3.5% Ge, 1.5% Sn, 3.2% Zr, and
3.2% Hf,
______________________________________ and the balance being at least 60% Fe wherein Co is substituted for Fe in an amount of more than zero and no more than 35 atomic % of the entire material provided that Fe is present in an amount of at least 40% and wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 5
Dependent Claim
184 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-80 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, at least one of additional elements M in amount(s) not exceeding the values by atomic percent as specified herein below provided that, when two or more elements M are added, the total amount thereof shall not exceed the largest value among said specified values of the elements actually added: ______________________________________
3.0% Ti, 6.5% Ni, 5.0% Bi,
5.3% V, 9.0% Nb, 7.0% Ta,
4.7% Cr, 5.2% Mo, 5.0% W,
6.0% Mn, 5.2% Al, 1.0% Sb,
3.5% Ge, 1.5% Sn, 3.2% Zr, and
3.2% Hf,
______________________________________ and the balance being at least 60% Fe wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 6
Dependent Claim
184 words
A sintered permanent magnetic material, said sintered permanent magnetic material having been prepared from a compacted metallic powder having a particle size of 0.3-80 microns and a composition consisting essentially of by atomic percent, 12.5-20% R wherein R is at least one rare earth element including Y and at least 50% of R consists of Nd and/or Pr, 4-20% B, at least one of additional elements M in amount(s) not exceeding the values by atomic percent as specified herein below provided that, when two or more elements M are added, the total amount thereof shall not exceed the largest value among said specified values of the elements actually added: ______________________________________
3.0% Ti, 6.5% Ni, 5.0% Bi,
5.3% V, 9.0% Nb, 7.0% Ta,
4.7% Cr, 5.2% Mo, 5.0% W,
6.0% Mn, 5.2% Al, 1.0% Sb,
3.5% Ge, 1.5% Sn, 3.2% Zr, and
3.2% Hf,
______________________________________ and the balance being at least 60% Fe wherein the sintered permanent magnetic material has a maximum energy product of at least 20 MGOe and has a density which is at least 95% of the theoretical density of the material.
Claim 7
Dependent Claim
23 words
A sintered permanent magnetic material as defined in claim 1 wherein Co is present at least 1 atomic % of the entire material.
Claim 8
Dependent Claim
23 words
A sintered permanent magnetic material as defined in claim 2 wherein Co is present at least 1 atomic % of the entire material.
Claim 9
Dependent Claim
24 words
A sintered permanent magnetic material as defined in claim 4, wherein Co is present no more than 25 atomic % of the entire material.
Claim 10
Dependent Claim
24 words
A sintered permanent magnetic material as defined in claim 5, wherein Co is present no more than 25 atomic % of the entire material.
Claim 11
Dependent Claim
23 words
A sintered permanent magnetic material as defined in claim 4, wherein Co is present at least 5 atomic % of the entire material.
Claim 12
Dependent Claim
23 words
A sintered permanent magnetic material as defined in claim 5, wherein Co is present at least 5 atomic % of the entire material.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |