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Transcript of Neodymium-Iron-Boron Magnets · PDF file (2/28) 003-02 / 20110524 / e331.fm • All...

  • • All specifications are subject to change without notice. • Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific

    bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

    NEOREC series

    Neodymium-Iron-Boron Magnets

    Issue date: May 2011

  • Introduction.................................................................................. 1

    Features/Applications.................................................................. 2

    Br/HCJ Characteristics Distribution .............................................. 3

    Irreversible Demagnetization Characteristics .............................. 5

    Magnet Structures/Magnetic Characteristics/

    Rust Prevention Treatments..................................................... 6

    Demagnetization Curves/Magnetic Characteristics

    NEOREC53B........................................................................... 8

    NEOREC50H........................................................................... 9

    NEOREC50B......................................................................... 10

    NEOREC47B......................................................................... 11

    NEOREC47H......................................................................... 12

    NEOREC46HF....................................................................... 13

    NEOREC46HG...................................................................... 14

    NEOREC44H......................................................................... 15

    NEOREC41H......................................................................... 16

    NEOREC45SH ...................................................................... 17

    NEOREC42SH ...................................................................... 18

    NEOREC43SX....................................................................... 19

    NEOREC40UH ...................................................................... 20

    NEOREC38UH ...................................................................... 21

    NEOREC40TH....................................................................... 22

    NEOREC35UX ...................................................................... 23

    NEOREC35NX ...................................................................... 24

    NEOREC30EV....................................................................... 25

    NEOREC42B......................................................................... 26

    NEOREC40H......................................................................... 27

    NEOREC37H......................................................................... 28

    Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

    NEOREC(NEODYMIUM-IRON-BORON) MAGNETS

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    • All specifications are subject to change without notice.

    Neodymium-Iron-Boron Magnets NEOREC Series

    INTRODUCTION

    In recent years, small, high-performance rare-earth magnets have been in increasing demand for use in electronics equipment.

    In 1977, TDK commercialized a 2-17 type REC magnet, solving the problem of high cost, the main drawback with conventional samarium-

    cobalt magnets. It not only achieved better cost-performance, its superior performance was appraised as being the highest in the world.

    The NEOREC magnet is a new product, surpassing the REC magnet. The main raw materials are neodymium, a rare-earth element, iron

    and boron. Its magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(BH), achieving 50 to

    80% high performance with 10% reduction in specific gravity compared with samarium-cobalt magnets.

    Ideal for meeting miniaturization and weight reduction needs for VCMs and other equipment. TDK offers a selection of custom magnets in

    any shapes and sizes to meet customers’ requirements.

    TDK also provides a range of technical services, including design of NEOREC magnet-applied products. For further information, please

    contact TDK or your nearest representatives.

    • Development of this product was made under license granted for the use of proprietary techniques developed by Hitachi Metals, Ltd.

    • Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

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    FEATURES/APPLICATIONS

    FEATURES • Magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(BH) max, achieving 50 to 80%

    higher performance than rare-earth cobalt magnet.

    • The specific gravity is 7.4g/cm3 more than 10% lower than that of rare-earth cobalt magnet. Ideal for meeting miniaturization and weight

    reduction needs.

    • Higher mechanical strength such as bending and tensile strength than rare-earth cobalt magnets, making handling easier than before.

    • Since the main raw materials are neodymium and iron, both abundant resources, stable supply is assured.

    APPLICATIONS Actuators for magnetic and optical disks, core-less motors, servomotors, stepping motors, MRI’s printers, sensors, magnetrons, klystrons,

    magnetic bearings, magnetic couplings, etc.

    DIFFRENCES BETWEEN NdFe-MAGNET AND SmCo-MAGNET

    ∗ C// is the value measured in the easy magnetization direction. C⊥ is the value measured in the vertical direction to the easy magnetization direction.

    Item NdFe-magnet SmCo-magnet Composition Nd, Fe, B, and other additives Sm, Co, Fe, Cu, and other additives Manufacturing method Sintering Sintering Magnetic characteristics Maximum energy product (BH)max 28 to 49MGOe 16 to 32MGOe Residual flux density Br 10.3 to 13.0kG 8.2 to 11.6kG Intrinsic coercive force HCJ 11.0 to 25.0kOe 6.2 to 20.0kOe Recoil permeability 1.05 1.05 Reversible temperature coefficient of Br –0.11 to –0.13%/°C –0.03 to –0.04%/°C Temperature coefficient of HCJ –0.55 to –0.65%/°C –0.15 to –0.30%/°C Physical characteristics Curie temperature 320°C 800°C Density 7.3 to 7.5g/cm3 8.2 to 8.4g/cm3

    Thermal expansion coefficient C//∗(0 to 100°C) 5.2× 10–6/°C 8× 10–6/°C C⊥ ∗(0 to 100°C) –0.8× 10–6/°C 11× 10–6/°C

    Mechanical characteristics Deflection strength 25kg/mm2 15kg/mm2

    Compressive strength 110kg/mm2 82kg/mm2

    Tensile strength 7.5kg/mm2 3.6kg/mm2

    Vickers hardness 550 to 650 500 to 550 Electric resistance 130× 10–6Ω cm 86× 10–6Ω cm

    Required magnetizing field 25kOe min. 15kOe min.(SmCo5 system) 25kOe min.(Sm2Co27 system)

    Resistance to cracking Solid, hard to break Brittle easily Resistance to rust Relatively easy to rust Relatively resistant to rust

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    Br/HCJ CHARACTERISTICS DISTRIBUTION

    5 10 15 20 25 30

    500

    (kG)[T]

    35 (kOe)

    [kA/m]

    15

    14

    13

    12

    11

    10

    9

    8

    7

    6

    1.5

    1.4

    1.3

    1.2

    1.1

    1.0

    0.9

    0.8

    0.7

    0.6

    30002500200015001000

    R es

    id ua

    l f lu

    x de

    ns ity

    B r

    Intrinsic coercive force HCJ

    NEOREC(Nd-Fe-B magnets)

    Sm-Co magnets

    CM(Nd-Fe-B Bonded magnets)

    CM8BLH

    CM8BL

    CM11SHCM11UH

    50B 47H50H

    44H

    46HF

    46HG

    42SH

    45SH

    38UH

    40UH 40TH

    43SX

    32A 30

    24

    26

    22

    32AH

    18

    40H

    37H

    26A

    47B

    42B

    Transverse magnetic field press

    Axial magnetic field press

    41H

    53B

    35UX 30EV

    35NX

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    TRANSVERSE MAGNETIC FIELD PRESS

    AXIAL MAGNETIC FIELD PRESS

    2500[kA/m]

    35(kOe)10 15 20 25 30 10

    11

    15 (kG)

    12

    13

    14

    Intrinsic coercive force HCJ

    R es

    id ua

    l f lu

    x de

    ns ity

    B r

    1000 1500 2000

    53B

    50H

    44H

    42SH

    45SH

    47B

    50B

    41H

    35UX

    38UH

    43SX

    47H

    46HF

    40UH

    1.5 [T]

    1.0

    1.1

    1.2

    1.3

    1.4

    Pole piece Direction of

    magnetic field

    Under punch

    Upper punch

    Direction of pressed powder

    Die

    Magnetic powder

    Magnetic field coil

    • Block magnet(type) for pick up

    SN • For automotive

    actuator • For pager

    • For FA’s motor

    2500[kA/m]

    35(kOe)10 15 20 25 30 10

    11

    15 (kG)

    12

    13

    14

    Intrins