WO2010106407A1 - METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL - Google Patents
METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL Download PDFInfo
- Publication number
- WO2010106407A1 WO2010106407A1 PCT/IB2010/000358 IB2010000358W WO2010106407A1 WO 2010106407 A1 WO2010106407 A1 WO 2010106407A1 IB 2010000358 W IB2010000358 W IB 2010000358W WO 2010106407 A1 WO2010106407 A1 WO 2010106407A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ndfebcu
- alloy
- magnetic material
- larger
- ribbon
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0433—Nickel- or cobalt-based alloys
- C22C1/0441—Alloys based on intermetallic compounds of the type rare earth - Co, Ni
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
Definitions
- the present invention relates to a method for producing an NdFeBCu magnet and an NdFeBCu magnet material, and, more particularly, to a method for producing an NdFeBCu magnet that has a coercivity that is comparable or superior to that of an magnetic material that contains a rare metal such as Dy, Tb, Co or Cr without the addition of a large amount of the rare metal and an NdFeB-type magnet material for the NdFeBCu magnet.
- a rare metal such as Dy, Tb, Co or Cr
- Magnetic materials are broadly classified into two groups: hard magnetic materials and soft magnetic materials.
- Hard magnetic materials are required to have a high coercivity, whereas soft magnetic materials are required to have a high maximum magnetization even if their coercivities are lower.
- the coercivity typical of hard magnetic materials is a characteristic relating to the stability of magnet, and as the coercivity is higher, the magnet can be used at a higher temperature and has a longer life.
- NdFeB-type magnet is known as a magnet of a hard magnetic material. It is known that an NdFeB-type magnet can contain fine textures. It is also known that a liquid-quenched ribbon that contains fine textures can be improved in coercivity. However, the NdFeB-type liquid-quenched ribbon that contains fine textures does not have sufficient temperature characteristics as a magnetic material, and various proposals have been therefore made to improve the coercivity-temperature characteristics thereof.
- a quenched thin strip-shaped alloy As a specific example of quaternary-type alloy, a
- the present invention provides an NdFeB-type magnetic material that has a coercivity that is comparable or superior to the magnet which is obtained when a rare metal such as Dy, Tb Co or Cr is added, without the addition of a large amount of the rare metal.
- a first aspect of the present invention relates to an NdFeBCu magnetic material that includes a quenched ribbon composed of an Nd-Fe-B-Cu alloy.
- the Nd-Fe-B-Cu alloy may have a composition that is represented by the general formula NdFeBGiA, and A may be a number that represent an atomic percent and may be between 1 and 3 inclusive.
- the Nd-Fe-B-Cu alloy may have a composition that is represented by the general formula Nd y Fe ⁇ o- x - y - z B z Cux, where x, y, and z may be numbers that represent atomic percents, x may be between 1 and 3 inclusive, y may be a number that is larger than 12, and z is a number that may be larger than 6.
- y may be larger than 12 and at most 24 and z may be larger than 6 and at most 12.
- y may be 14 or larger and z may be 7 or larger.
- the Nd-Fe-B-Cu alloy may have a composition that is represented by the general formula Nd 15 Fe 77 B 7 CUi.
- the Nd-Fe-B-Cu alloy has a composition of a quaternary alloy composed of Nd, Fe, B and Cu.
- a second aspect of the present invention relates to a method for producing an
- NdFeBCu magnet that includes supplying an alloy melt having a composition that is represented by the general formula Nd y Feioo -x-y _ z B z Cu ⁇ , where x is between 1 and 3 inclusive, y is larger than 12 and at most 24, and z is larger than 6 and at most 12, onto a cooled roll to obtain a quenched ribbon as a ribbon shaped magnetic material.
- the method according to this aspect may further include: removing columnar crystalline textures from the quenched ribbon; pulverizing the quenched ribbon from which the columnar crystalline textures have been removed; and subjecting the quenched ribbon, which has been pulverized, to pressure sintering to obtain a bulk body.
- subjecting the quenched ribbon to pressure sintering may include subjecting the quenched ribbon to electric current heating for 5 to 100 minutes under conditions of a contact pressure during sintering of 10 to 1000 MPa, a temperature that is 550 0 C or higher and 600 0 C or lower, and a vacuum of 10 "2 MPa or less.
- y may be 14 or larger, and z may be 7 or larger.
- the alloy melt may be composed of Nd y Fe 100-x- y -z B z Cu ⁇ that has been molten at a temperature of 1400 to 1700 0 C, and supplying an alloy melt onto a roll may include spraying the alloy melt onto the roll, which has a peripheral speed of 1.0 to 3.2 m/sec, under reduced pressure or in an inert gas atmosphere under conditions of a clearance of 0.6 to 1.2 mm and a spray pressure of 0.2 to 2 kg/cm 3 .
- FIG. 1 is a graph that shows the coercivity-temperature characteristics of a quenched ribbon according to one embodiment of the present invention and quenched ribbons according to comparative examples;
- FIG. 2 is a graph that shows the normalized coercivity-temperature characteristics of a quenched ribbon according to one embodiment of the present invention and quenched ribbons according to comparative examples; and
- FIG. 3 is a schematic view of a single-roll furnace for use in the production of a quenched ribbon in examples of the present invention.
- the quenched NdFeBCu 1 is generally comparable or superior in coercivity-temperature characteristics to a quenched NdFeBCo 1O ribbon. It is believed that the high-temperature coercivity of the quenched NdFeBCui ribbon indicates the fact that a magnetic material that has excellent coercivity-temperature characteristics can be obtained since fine textures are formed when a quenched ribbon is produced from the alloy melt that has the above composition.
- a quenched ribbon is a thin strip or a ribbon that can be obtained by quenching an alloy melt.
- the magnetic material of this embodiment needs to be a quenched ribbon (a ribbon-shaped magnet material) composed of an Nd-Fe-B-Cu.
- the Nd-Fe-B-QiA in this embodiment is a quaternary alloy that is composed of Nd (Neodymium), Fe (Iron), B (Boron) and Cu . (Copper) and is obtained by substituting Cu for a part of one of the elements, such as B, of a ternary alloy which is composed of Nd, Fe and B.
- the Nd-Fe-B-Cu alloy in this embodiment may have a composition that is represented by the general formula NdFeBGi A , and A may be a number that represent an atomic percent and may be between 1 and 3 inclusive. There are some elements that are effective to improve the room-temperature coercivity when added to the above alloy but no element except Cu has been found that is effective to improve the temperature characteristics.
- a quenched ribbon that has good coercivity-temperature characteristics can be obtained by creating an NdFeB-type quenched ribbon that has a composition that is richer in Nd or B than that of the stoichiometric region (Nd 12 FeS 2 B 6 ).
- One method to obtain the quenched ribbon is quenching by, for example, a melt spinning process.
- One specific means for accomplishing this is to produce a quenched ribbon using a roll.
- One specific example is a method that includes supplying an alloy melt having a composition that is represented by the general formula NdyFeioo- x - y -zB z Cux as described above onto a cooling roll under reduced pressure or in an inert gas atmosphere under conditions of a roll peripheral speed of 1.0 to 3.2 m/sec, a clearance of 0.6 to 1.2 mm, a spray pressure of 0.2 to 2 kg/cm 3 , and a melt temperature of 1400 to 1700 0 C, quenching the alloy melt on a surface of the roll to convert the alloy into fine textures, and peeling the ribbon-shaped magnetic material off the cooling roll.
- the quenched Nd-Fe-B-Cu alloy ribbon of this embodiment can be obtained by preparing an alloy ingot from specified amounts of Nd, Fe, FeB and Cu that give the above atomic percents in a melting furnace, such as an arc melting furnace, and casting the resulting alloy ingot with a casting device, such as a roll furnace that includes, for example, a melt reservoir that reserves alloy melt, a nozzle that supplies the melt, a cooling roll, a winder, a motor for the cooling roll, a winder motor, and a cooler for the cooling roll.
- a melting furnace such as an arc melting furnace
- a casting device such as a roll furnace that includes, for example, a melt reservoir that reserves alloy melt, a nozzle that supplies the melt, a cooling roll, a winder, a motor for the cooling roll, a winder motor, and a cooler for the cooling roll.
- a bulk body can be obtained from the quenched Nd-Fe-B-Gi A ribbon of this embodiment by, for example, a method that includes pulverizing the quenched ribbon or the residual that remains after the removal of columnar crystalline textures from the quenched ribbon, and subjecting the pulverized material to electric current sintering with an electric current sintering apparatus including dies, a temperature sensor, a control unit, a power supply unit, a heating element, electrodes, a heat insulating material, a metal support, and a vacuum chamber.
- an electric current sintering apparatus including dies, a temperature sensor, a control unit, a power supply unit, a heating element, electrodes, a heat insulating material, a metal support, and a vacuum chamber.
- the pressure sintering can be carried out by means of electric current sintering for 5 to 100 minutes under conditions of, for example, a contact pressure during sintering of 10 to 1000 MPa, a temperature between 550 0 C and 600 0 C inclusive, and a vacuum of 10 " MPa or less.
- Example 1 is described below. Specified amounts of Nd, Fe, FeB and Cu that gave an atomic ratio of Nd, Fe, B and Cu of 15:77:7:1 were weighed and an alloy ingot was prepared in an arc melting furnace. Then, the alloy ingot was melted by applying high-frequency waves in the single-roll furnace. The alloy melt was then sprayed onto a copper roll under the following single-roll furnace use conditions, thereby obtaining a quenched ribbon. Single-roll furnace use conditions were nozzle diameter: 0.6 mm, clearance: 1.0 mm, spray pressure: 0.4 kg/cm 3 , roll peripheral speed: 2.5 m/sec, and melt temperature: 145O 0 C.
- the magnetic characteristics of the resulting quenched Nd 1S Fe 77 B 7 Cu 1 ribbon were evaluated using the high-temperature VSM. The result is summarized in FIG. 1 and FIG. 2.
- the normalized coercivity means the magnetic force of the quenched ribbon normalized with respect to its room-temperature coercivity taken as 1.
- Comparative Example 1 is described below. Specified amounts of Nd, Fe, FeB and Co that gave an atomic ratio of Nd, Fe, Co and B of 15:67:10:8 were weighed and an alloy ingot was prepared in an arc melting furnace. Then, a quenched ribbon was formed in the same manner as in Example 1. The magnetic characteristics of the resulting quenched Nd 1 SFe 67 Co 1O Bs ribbon were evaluated using the high-temperature VSM. The result is summarized in FIG. 1 and FIG. 2.
- Comparative Example 2 is described below. Specified amounts of Nd, Fe, and FeB that gave an atomic ratio of Nd, Fe and B of 15:77:8 were weighed and an alloy ingot was prepared in an arc melting furnace. Then, a quenched ribbon was formed in the same manner as in Example 1. The magnetic characteristics of the resulting quenched Nd I sFe 77 B 8 ribbon were evaluated using the high-temperature VSM. The result is summarized in FIG. 1 and FIG. 2.
- the ternary-type quenched Ndi 5 Fe 77 Bs ribbon has a low room-temperature coercivity but a magnetic material that has a high room-temperature coercivity can be obtained when a part of B is substituted by Cu to form a quaternary-type quenched Ndi 5 Fe 77 B 7 Cui ribbon.
- a magnetic material that has excellent coercivity-temperature characteristics can be obtained without adding a large amount of a rare metal such as Dy, Tb, Co or Cr.
- a magnetic material that is has a high high-temperatre coercivity can be obtained with reduced costs and resource risks and an inexpensive NdFeBCu magnet that has a high coercivity can be provided.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112010001189T DE112010001189T5 (en) | 2009-03-17 | 2010-02-24 | A method of manufacturing a NdFeBCu magnet and a NdFeBCu magnetic material |
US13/254,894 US20110318215A1 (en) | 2009-03-17 | 2010-02-24 | METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL |
CN2010800121082A CN102356436A (en) | 2009-03-17 | 2010-02-24 | Method for production of ndfebcu magnet and ndfebcu magnet material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009064790A JP2010215972A (en) | 2009-03-17 | 2009-03-17 | NdFeBCu MAGNET MATERIAL |
JP2009-064790 | 2009-03-17 |
Publications (1)
Publication Number | Publication Date |
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WO2010106407A1 true WO2010106407A1 (en) | 2010-09-23 |
Family
ID=42060506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2010/000358 WO2010106407A1 (en) | 2009-03-17 | 2010-02-24 | METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110318215A1 (en) |
JP (1) | JP2010215972A (en) |
CN (1) | CN102356436A (en) |
DE (1) | DE112010001189T5 (en) |
WO (1) | WO2010106407A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4770723A (en) * | 1982-08-21 | 1988-09-13 | Sumitomo Special Metals Co., Ltd. | Magnetic materials and permanent magnets |
US5009706A (en) * | 1989-08-04 | 1991-04-23 | Nippon Steel Corporation | Rare-earth antisotropic powders and magnets and their manufacturing processes |
US5125988A (en) * | 1987-03-02 | 1992-06-30 | Seiko Epson Corporation | Rare earth-iron system permanent magnet and process for producing the same |
EP1026706A1 (en) * | 1998-05-18 | 2000-08-09 | Sumitomo Special Metals Company Limited | FEEDSTOCK POWDER FOR R-Fe-B MAGNET AND PROCESS FOR PRODUCING R-Fe-B MAGNET |
JP2000252107A (en) | 1999-03-02 | 2000-09-14 | Sumitomo Special Metals Co Ltd | Semirigid magnetic material having high magnetic flux density, its manufacture, and hysteresis coupling device |
JP2002030595A (en) | 2000-07-17 | 2002-01-31 | Japan Pmc Corp | Resin composition for coating paper and composition for coating paper by using the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03194906A (en) * | 1989-12-22 | 1991-08-26 | Nippon Steel Corp | Manufacture of rare earth magnet |
JPH0483307A (en) * | 1990-07-26 | 1992-03-17 | Nippon Steel Corp | Manufacture of rare-earth element magnet |
JPH05152113A (en) * | 1991-08-16 | 1993-06-18 | Nippon Steel Corp | Manufacture of rare-earth anisotropic magnet powder |
JPH1154308A (en) * | 1997-07-31 | 1999-02-26 | Seiko Epson Corp | Manufacture and apparatus of magnet powder by melt quenching |
-
2009
- 2009-03-17 JP JP2009064790A patent/JP2010215972A/en active Pending
-
2010
- 2010-02-24 WO PCT/IB2010/000358 patent/WO2010106407A1/en active Application Filing
- 2010-02-24 DE DE112010001189T patent/DE112010001189T5/en not_active Ceased
- 2010-02-24 CN CN2010800121082A patent/CN102356436A/en active Pending
- 2010-02-24 US US13/254,894 patent/US20110318215A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4770723A (en) * | 1982-08-21 | 1988-09-13 | Sumitomo Special Metals Co., Ltd. | Magnetic materials and permanent magnets |
US5125988A (en) * | 1987-03-02 | 1992-06-30 | Seiko Epson Corporation | Rare earth-iron system permanent magnet and process for producing the same |
US5009706A (en) * | 1989-08-04 | 1991-04-23 | Nippon Steel Corporation | Rare-earth antisotropic powders and magnets and their manufacturing processes |
EP1026706A1 (en) * | 1998-05-18 | 2000-08-09 | Sumitomo Special Metals Company Limited | FEEDSTOCK POWDER FOR R-Fe-B MAGNET AND PROCESS FOR PRODUCING R-Fe-B MAGNET |
JP2000252107A (en) | 1999-03-02 | 2000-09-14 | Sumitomo Special Metals Co Ltd | Semirigid magnetic material having high magnetic flux density, its manufacture, and hysteresis coupling device |
JP2002030595A (en) | 2000-07-17 | 2002-01-31 | Japan Pmc Corp | Resin composition for coating paper and composition for coating paper by using the same |
Also Published As
Publication number | Publication date |
---|---|
CN102356436A (en) | 2012-02-15 |
US20110318215A1 (en) | 2011-12-29 |
JP2010215972A (en) | 2010-09-30 |
DE112010001189T5 (en) | 2012-04-26 |
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