EP0106948A2
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EP
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Permanently magnetizable alloys, magnetic materials and permanent magnets comprising FeBR or (Fe,Co)BR (R=vave earth)
Assignee: Proterial Ltd
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Filing: 1983-07-26
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Granted: —
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Expires: 2003-07-26
Abstract
Abstract Magnetic materials comprising Fe, B, R (rare earth elements) and Co having a major phase of Fe-Co-B-R intermetallic compound(s) of tetragonal system, and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B, no less than 50% Co, and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W. Mn, Al, Sb, Ge, Sn. Zr. Hf) providing Fe-Co-B-R-M type materials and magnets.
Inventors
- 👤 Masato Sagawa
- 👤 Setsuo Hanazonodanchi 14-106 Fujimura
- 👤 Yutaka Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
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: 58
Claim 1
Independent Claim
47 words
A magnetic material comprising Fe, B, R wherein R is at least one rare earth element including Y, and Co, and in which a major phase is formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system.
Claim 2
Dependent Claim
47 words
A magnetic material comprising Fe, B, R wherein R is at least one rare earth element including Y, and Co, and in which a major phase is formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system.
Claim 3
Dependent Claim
60 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound consisting essentially of, by atomic percent , 8 - 30 percent R wherein R is at least one of rare earth elements including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 4
Dependent Claim
60 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound consisting essentially of, by atomic percent , 8 - 30 percent R wherein R is at least one of rare earth elements including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 5
Dependent Claim
64 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound of the substantially tetragonal system, and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 6
Dependent Claim
64 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound of the substantially tetragonal system, and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 7
Dependent Claim
48 words
A sintered anisotropic permanent magnet consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 8
Dependent Claim
48 words
A sintered anisotropic permanent magnet consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 9
Dependent Claim
73 words
A sintered anisotropic permanent magnet having a major phase formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system, and consisting essentially of, by atomic percent 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 10
Dependent Claim
73 words
A sintered anisotropic permanent magnet having a major phase formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system, and consisting essentially of, by atomic percent 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, and the balance being Fe with impurities.
Claim 11
Dependent Claim
24 words
A magnetic material as defined in Claim 1 or 3, in which the substantially tetragonal system amounts to no less than 50 vol %.
Claim 12
Dependent Claim
22 words
A permanent magnet as defined in Claim 5, in which the substantially tetragonal system amounts to no less than 50 vol %.
Claim 13
Dependent Claim
21 words
A permanent magnet as defined in Claim 7, which contains no less than 1 vol % of nonmagnetic intermetallic compound phases.
Claim 14
Dependent Claim
22 words
A permanent magnet as defined in Claim 4 or 5, in which the mean crystal grain size is 1 to 100 µm.
Claim 15
Dependent Claim
20 words
A permanent magnet as defined in Claim 9, in which the mean crystal grain size is 1.5 to 50 µm.
Claim 16
Dependent Claim
25 words
A permanent magnet as defined in Claim 4 or 5, in which R is 12 - 24 %, and B is 3 - 27 %.
Claim 17
Dependent Claim
23 words
A permanent magnet as defined in Claim 11, in which R is 12 - 20 %, and B is 4 - 24 %.
Claim 18
Dependent Claim
16 words
A permanent magnet as defined in Claim 12, in which Co is 5 - 45 %.
Claim 19
Dependent Claim
19 words
A permanent magnet as defined in Claim 4 or 5, in which Co is no more than 25 %.
Claim 20
Dependent Claim
18 words
A permanent magnet as defined in Claim 4 or 5, in which Co is 5 % or more.
Claim 21
Dependent Claim
31 words
A permanent magnet as defined in Claim 4 or 5, in which the light-rare earth element(s) amounts to no less than 50 at % of the overall rare earth elements R.
Claim 22
Dependent Claim
31 words
A permanent magnet as defined in Claim 16, in which the sum of Nd plus Pr amounts to no less than 50 at % of the overall rare earth elements R.
Claim 23
Dependent Claim
23 words
A permanent magnet as defined in Claim 16 or 17, in which R is about 15 %, and B is about 8 %.
Claim 24
Dependent Claim
23 words
A permanent magnet as defined in Claim 4 or 5, in which the maximum energy product (BH)max is no less than 4 MGOe.
Claim 25
Dependent Claim
21 words
A permanent magnet as defined in Claim 11, in which the maximum energy product (BH)max is no less than 7 MGOe.
Claim 26
Dependent Claim
22 words
21: A permanent magnet as defined in Claim 12, in which the maximum energy product (BH)max is no less than 10 MGOe.
Claim 27
Dependent Claim
21 words
A permanent magnet as defined in Claim 21, in which the maximum energy product (BH)max is no less than 20 MGOe.
Claim 28
Dependent Claim
21 words
A permanent magnet as defined in Claim 22, in which the maximum energy product (BH)max is no less than 30 MGOe.
Claim 29
Dependent Claim
21 words
A permanent magnet as defined in Claim 23, in which the maximum energy product (BH)max is no less than 33 MGOe.
Claim 30
Dependent Claim
109 words
A magnetic material which comprises Fe, B, R wherein R is at least one rare earth element including Y, Co, and at least one element M selected from the group given below in the amounts of no more than the values specified below, wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added and the amount of M is more than zero, and in which a major phase is formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system:
Claim 31
Dependent Claim
109 words
A magnetic material which comprises Fe, B, R wherein R is at least one rare earth element including Y, Co, and at least one element M selected from the group given below in the amounts of no more than the values specified below, wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added and the amount of M is more than zero, and in which a major phase is formed of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system:
Claim 32
Dependent Claim
121 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, no more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added and the amount of M is more than zero, and the balance being Fe with impurities:
Claim 33
Dependent Claim
121 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, no more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added and the amount of M is more than zero, and the balance being Fe with impurities:
Claim 34
Dependent Claim
127 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound of the substantially tetragonal system, and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below - of said elements M actually added and the amount of M is more than zero, and the balance being Fe with impurities:
Claim 35
Dependent Claim
127 words
A sintered magnetic material having a major phase formed of at least one intermetallic compound of the substantially tetragonal system, and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below - of said elements M actually added and the amount of M is more than zero, and the balance being Fe with impurities:
Claim 36
Dependent Claim
110 words
A sintered anisotropic permanent magnet consisting essentially of, by atomic percent, 8 - 30 percent R, wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below, wherein the amount of M is not zero and wherein when more than one element comprises M, the sum of M is no more than the. maximum value among the values specified below of said elements M actually added, and the balance being Fe with impurities:
Claim 37
Dependent Claim
110 words
A sintered anisotropic permanent magnet consisting essentially of, by atomic percent, 8 - 30 percent R, wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts of no more than the values specified below, wherein the amount of M is not zero and wherein when more than one element comprises M, the sum of M is no more than the. maximum value among the values specified below of said elements M actually added, and the balance being Fe with impurities:
Claim 38
Dependent Claim
134 words
A sintered anisotropic permanent magnet having a major phase formed, of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts no more than the values specified below, wherein the amount of M is not zero and wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added, and the balance being Fe with impurities:
Claim 39
Dependent Claim
134 words
A sintered anisotropic permanent magnet having a major phase formed, of at least one intermetallic compound of the Fe-Co-B-R type having a crystal structure of the substantially tetragonal system and consisting essentially of, by atomic percent, 8 - 30 percent R wherein R is at least one rare earth element including Y, 2 - 28 percent B, more than zero and not exceeding 50 percent Co, at least one additional element M selected from the group given below in the amounts no more than the values specified below, wherein the amount of M is not zero and wherein when more than one element comprises M, the sum of M is no more than the maximum value among the values specified below of said elements M actually added, and the balance being Fe with impurities:
Claim 40
Dependent Claim
24 words
A magnetic material as defined in Claim 25 or 27, in which the substantially tetragonal system amounts to no less than 50 vol %.
Claim 41
Dependent Claim
22 words
A permanent magnet as defined in Claim 29, in which the substantially tetragonal system amounts to no less than 50. vol %.
Claim 42
Dependent Claim
21 words
A permanent magnet as defined in Claim 31, which contains no less than 1 vol % of nonmagnetic intermetallic compound phases.
Claim 43
Dependent Claim
22 words
A permanent magnet as defined in Claim 28 or 29, in which the mean crystal grain size is 1 to 100 µm.
Claim 44
Dependent Claim
20 words
A permanent magnet as defined in Claim 33, in which the mean crystal grain size is 1.5 to 50 µm.
Claim 45
Dependent Claim
25 words
A permanent magnet as defined in Claim 28 or 29, in which R is 12 to 24 %, and B is 3 to 27 %.
Claim 46
Dependent Claim
23 words
A permanent magnet as defined in Claim 35, in which R is 12 to 20 %, and B is 4 to 24 %.
Claim 47
Dependent Claim
16 words
A permanent magnet as defined in Claim 36, in which Co is 5 - 45 %.
Claim 48
Dependent Claim
19 words
A permanent magnet as defined in Claim 28 or 29, in which Co is no more than 25 %.
Claim 49
Dependent Claim
18 words
A permanent magnet as defined in Claim 28 or 29, in which Co is 5 % or more.
Claim 50
Dependent Claim
32 words
A permanent magnet as defined in Claim 31 or 32, in which the light rare earth element(s) amounts to no less than 50 at % of the overall rare earth elements R.
Claim 51
Dependent Claim
31 words
A permanent magnet as defined in Claim 40, in which the sum of Nd plus Pr amounts to no less than 50 at % of the overall rare earth elements R.
Claim 52
Dependent Claim
23 words
A permanent magnet as defined in Claim 40 or 41, in which R is about 15 %, and B is about 8 %.
Claim 53
Dependent Claim
23 words
A permanent magnet as defined in Claim 28 or 29, in which the maximum energy product (BH)max is no less than 4 MGOe.
Claim 54
Dependent Claim
21 words
A permanent magnet as defined in Claim 35, in which the maximum energy product (BH)max is no less than 7 MGOe.
Claim 55
Dependent Claim
21 words
A permanent magnet as defined in Claim 36, in which the maximum energy product (BH)max is no less than 10 MGOe.
Claim 56
Dependent Claim
21 words
A permanent magnet as defined in Claim 45, in which the maximum energy product (BH)max is no less than 20 MGOe.
Claim 57
Dependent Claim
21 words
A permanent magnet as defined in Claim 46, in which the maximum energy product (BH)max is no less than 30 MGOe.
Claim 58
Dependent Claim
21 words
A permanent magnet as defined in Claim 47, in which the maximum energy product (BH)max is no less than 33 MGOe.
References Cited (Backward Citations)
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