Neodymium-Iron-Boron Magnets · PDF filediffrences between ndfe-magnet and smco-magnet...
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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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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.
APPLICATIONSActuators for magnetic and optical disks, core-less motors, servomotors, stepping motors, MRIs 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-magnetComposition Nd, Fe, B, and other additives Sm, Co, Fe, Cu, and other additivesManufacturing method Sintering SinteringMagnetic characteristicsMaximum energy product (BH)max 28 to 49MGOe 16 to 32MGOeResidual flux density Br 10.3 to 13.0kG 8.2 to 11.6kGIntrinsic coercive force HCJ 11.0 to 25.0kOe 6.2 to 20.0kOeRecoil permeability 1.05 1.05Reversible temperature coefficient of Br 0.11 to 0.13%/C 0.03 to 0.04%/CTemperature coefficient of HCJ 0.55 to 0.65%/C 0.15 to 0.30%/CPhysical characteristicsCurie temperature 320C 800CDensity 7.3 to 7.5g/cm3 8.2 to 8.4g/cm3
Thermal expansion coefficientC//(0 to 100C) 5.2 106/C 8 106/CC (0 to 100C) 0.8 106/C 11 106/C
Mechanical characteristicsDeflection 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 550Electric resistance 130 106 cm 86 106 cm
Required magnetizing field 25kOe min.15kOe min.(SmCo5 system)25kOe min.(Sm2Co27 system)
Resistance to cracking Solid, hard to break Brittle easilyResistance 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
Res
idua
l flu
x de
nsity
Br
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
40UH40TH
43SX
32A30
24
26
22
32AH
18
40H
37H
26A
47B
42B
Transverse magnetic field press
Axial magnetic field press
41H
53B
35UX30EV
35NX
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TRANSVERSE MAGNETIC FIELD PRESS
AXIAL MAGNETIC FIELD PRESS
2500[kA/m]
35(kOe)10 15 20 25 3010
11
15(kG)
12
13
14
Intrinsic coercive force HCJ
Res
idua
l flu
x de
nsity
Br
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 pieceDirection of
magnetic field
Underpunch
Upperpunch
Direction of pressed powder
Die
Magneticpowder
Magnetic fieldcoil
Block magnet(type) forpick up
SN For automotive
actuator For pager
For FAs motor
2500[kA/m]
35(kOe)10 15 20 25 3010
11
15(kG)
12
13
14
Intrinsic coercive force HCJ
Res
idua
l flu
x de
nsity
Br
1000 1500 2000
42B
40H
37H
1.5[T]
1.0
1.1
1.2
1.3
1.4
VCM
Underpunch
Upperpunch
Direction of pressed powder
Magnetic field coil
Magneticpowder
For ABSs sensor
For CDs and MDs clamper
For camcorders motor
For optical pickup
For FAs motor For automotive
actuator
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IRREVERSIBLE DEMAGNETIZATION CHARACTERISTICS