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US5147447A
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Sintered rare earth metal-boron-iron alloy magnets and a method for their production
Assignee: Mitsubishi Materials Corp
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Filing: 1989-05-15
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Granted: 1992-09-15
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Expires: 2009-05-15
Abstract
Abstract PCT No. PCT/JP89/00491 Sec. 371 Date Feb. 2, 1990 Sec. 102(e) Date Feb. 2, 1990 PCT Filed May 15, 1989 PCT Pub. No. WO89/12113 PCT Pub. Date Dec. 14, 1989.The present invention provides sintered rare earth metal-boron-iron alloy magnets having superior anti-corrosion properties in which the magnetic properties do not deteriorate with time obtained by adding at least one oxide powder chosen from the group including Al, Ga, Ni, Co, Mn, Cr, Ti, V, Nb, Y, Ho, Er, Tm, Lu, as well as Eu, as well as at least one hydride powder chosen from the group including Zr, Ta, Ti, Nb, V. Hf, and Y in an amount totalling from 0.0005 to 3.0 weight % to a R-B-Fe alloy powder; molding; sintering; and then carrying out heat treatment as necessary.
Inventors
- 👤 Takuo Takeshita
- 👤 Muneaki Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:55
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; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
105 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets comprising the steps of a) preparing a powder obtained by adding at least one additive agent of an oxide powder of Al, Ga, Ni, Co, Mn, Cr, Ti, V, Nb, Y, Ho, Er, Tm, Lu, Zr or Eu, or a hydride powder of Zr, Ta, Ti, Nb, V, Hf, or Y, to R-B-Fe alloy powder wherein R is a rare earth element or Y, the amount of said additive agent totaling from 0.0005 to 3.0 weight %, b) molding the alloy powder and additive agent; and, c) sintering the molded alloy powder and additive agent.
Claim 2
Dependent Claim
105 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets comprising the steps of a) preparing a powder obtained by adding at least one additive agent of an oxide powder of Al, Ga, Ni, Co, Mn, Cr, Ti, V, Nb, Y, Ho, Er, Tm, Lu, Zr or Eu, or a hydride powder of Zr, Ta, Ti, Nb, V, Hf, or Y, to R-B-Fe alloy powder wherein R is a rare earth element or Y, the amount of said additive agent totaling from 0.0005 to 3.0 weight %, b) molding the alloy powder and additive agent; and, c) sintering the molded alloy powder and additive agent.
Claim 3
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al an Zr oxide powders.
Claim 4
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al and Cr oxide powders.
Claim 5
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al and Ti oxide powders.
Claim 6
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al, Zr, and Cr oxide powders.
Claim 7
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al, Zr, and Ti oxide powders.
Claim 8
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al, Cr, and Ti oxide powders.
Claim 9
Dependent Claim
27 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Al, Zr, Cr, and Ti oxide powders.
Claim 10
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga and Al oxide powders.
Claim 11
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga and Cr oxide powders.
Claim 12
Dependent Claim
25 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga and V oxide powders.
Claim 13
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga, Al, and Cr oxide powders.
Claim 14
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga, Cr, and V oxide powders.
Claim 15
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga, Al, and V oxide powders.
Claim 16
Dependent Claim
27 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Ga, Al, Cr, and V oxide powders.
Claim 17
Dependent Claim
30 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is a hydride powder and R is a rare earth element.
Claim 18
Dependent Claim
49 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is an oxide powder of Y, Ho, Er, Tm, Lu, or Eu and R is a rare earth element of Nd, Pr, La, Ce, Dy, Sm, Tb, Gd, or Yb.
Claim 19
Dependent Claim
56 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is a Cr oxide powder and additionally comprising at least one nitride powder of Cr, Mn, Zr, Hf, Ti, Nb, Si, Ge, V, Ga, Al, or Co in an amount totaling from 0.0005 to 3.0 weight %.
Claim 20
Dependent Claim
55 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive is a Ni oxide powder and additionally comprising at least one nitride powder of Cr, Mn, Zr, Hf, Ti, Nb, Si, Ge, V, Ga, Al, or Co in an amount totaling from 0.0005 to 3.0 weight %.
Claim 21
Dependent Claim
55 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with claim 1 wherein the additive agent is Cr and Ni oxide powders, and at least one nitride powder of Cr, Mn, Zr, Hf, Ti, Nb, Si, Ge, V, Ga, Al, or Co in an amount totaling from 0.0005 to 3.0 weight %.
Claim 22
Dependent Claim
26 words
A manufacturing method for sintered rare earth metal-B-Fe alloy magnets in accordance with any one of claims 1 through 20 including heat treating the sintered compact.
Claim 23
Dependent Claim
74 words
A sintered rare earth metal-B-Fe alloy magnet comprising a R 2 Fe 14 B phase and an inter-granular boundary phase around said R 2 Fe 14 B phase, wherein R is a rare earth element or Y and said inter-granular boundary phase comprises at least one of Ni, Co, Mn, Cr, Ti, V, Al, Ga, In, Zr, Hf, Ta, Nb, Mo, Si, Re, or W in an amount of 20 to 90 atomic %.
Claim 24
Dependent Claim
74 words
A sintered rare earth metal-B-Fe alloy magnet comprising a R 2 Fe 14 B phase and an inter-granular boundary phase around said R 2 Fe 14 B phase, wherein R is a rare earth element or Y and said inter-granular boundary phase comprises at least one of Ni, Co, Mn, Cr, Ti, V, Al, Ga, In, Zr, Hf, Ta, Nb, Mo, Si, Re, or W in an amount of 20 to 90 atomic %.
Claim 25
Dependent Claim
29 words
A sintered rare earth metal-B-Fe alloy magnet in accordance with claim 22 additionally comprising oxygen in an amount of 30 to 70 atomic % in said inter-granular boundary phase.
Claim 26
Dependent Claim
64 words
A sintered rare earth metal-B-Fe alloy magnet comprising a R 2 Fe 14 B phase and an inter-granular boundary phase around said R 2 Fe 14 B phase, wherein R is a rare earth element or Y and said inter-granular boundary phase comprises R in an amount of 20 to 90 atomic % and oxygen in an amount of 30 to 70 atomic %.
Claim 27
Dependent Claim
64 words
A sintered rare earth metal-B-Fe alloy magnet comprising a R 2 Fe 14 B phase and an inter-granular boundary phase around said R 2 Fe 14 B phase, wherein R is a rare earth element or Y and said inter-granular boundary phase comprises R in an amount of 20 to 90 atomic % and oxygen in an amount of 30 to 70 atomic %.
Claim 28
Dependent Claim
50 words
A sintered rare earth metal-B-Fe alloy magnet in accordance with claim 24 additionally comprising at least one of Ni, Co, Mn, Cr, T, V, Al, Ga, In, Zr, Hf, Ta, Nb, Mo, Sn, Re, or W in an amount of 20 to 90 atomic % in said inter-granular boundary phase.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |