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NdFeB Magnets

NdFeB magnets, the third generation of rare earth permanent magnet, are composed of Neodymium, Iron, Boron and a few transition metals. They have high remanence,high coercive force, high energy product, and high performance /cost. Currently NdFeB magnets are the strongest magnets available in the world.

Manufacturing Process
Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB powder, then fine NdFeB powder will be compacted in a die and sintered, fusing thepowder into a solid material. There are 2 forms of pressing: die pressing and isostatic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.

Machining & Tolerance
Generally, NdFeB magnets must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on NdFeB materials using carbide tools, but surface finishes thus obtained may be less than optimal. The Standard tolerances for NdFeB magnets are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.

Surface treatments
The corrosion resistance of NdFeB magnets is considered poor. Surface coating or plating is therefore highly recommended for NdFeB magnets. All kinds of surface coating are available, like Nickel, Zn, Ni-Cu-Ni, Gold, Silver, Sn, Chrome. We also applied special surface protection to NdFeB magnets, like ABS coating, Rubber coating, PTFE(Telfon) coating, stainless steel case, etc.
Magnetizing & Packing
NdFeB magnets require extremely high magnetizing fields, and can be magnetized in any direction as long as it is aligned properly. In some instances multiple pole magnetization is possible with special fixtures.All NdFeB magnets are anisotropic, and can only be magnetized in the orientation direction, so particular consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.
NdFeB magnets are mechanically weak, and magnetically very strong. They should be packed properly in order to help user to use and handle them

Magnetic Properties of Sintered NdFeB Magnets

Grade

Remanence

(Br)

Coercive Force

(HcB)

Intrinsic Coercive Force HcJ

Max.Energy Product

(B-H) Max

Max

Operation

Temp.

mT

KG

KA/m

KOe

KA/m

KOe

KJ/ m3

MGOe

Tw

N30

1080-1130

10.8-11.3

≥ 796

≥ 10

≥ 955

≥ 12

233-247

28-31

80

N33

1130-1170

11.3-11.7

≥ 836

≥ 10.5

≥ 955

≥ 12

247-271

31-34

80

N35

1170-1220

11.7-12.2

≥ 868

≥ 10.9

≥ 955

≥ 12

263-287

33-36

80

N38

1220-1250

12.2-12.5

≥ 899

≥ 11.3

≥ 955

≥ 12

287-310

36-39

80

N40

1250-1280

12.5-12.8

≥ 907

≥ 11.4

≥ 955

≥ 12

302-326

38-41

80

N42

1280-1320

12.8-13.2

≥ 915

≥ 11.5

≥ 955

≥ 12

318-342

40-43

80

N45

1320-1380

13.2-13.8

≥ 923

≥ 11.6

≥ 955

≥ 12

342-366

43-46

80

N48

1380-1420

13.8-14.2

≥ 836

≥ 10.5

≥955

≥ 12

366-390

46-49

80

N50

1400-1450

14.0-14.5

≥ 796

≥ 10.0

≥ 876

≥ 11

382-406

48-51

60

N52

1430-1480

14.3-14.8

≥ 796

≥ 10.0

≥ 876

≥ 11

398-422

50-53

60

30M

1080-1130

10.8-11.3

≥ 796

≥ 10.0

≥ 1114

≥ 14

223-247

28-31

100

33M

1130-1170

11.3-11.7

≥ 836

≥ 10.5

≥ 1114

≥ 14

247-263

31-33

100

35M

1170-1220

11.7-12.2

≥ 868

≥ 10.9

≥ 1114

≥ 14

263-287

33-36

100

38M

1220-1250

12.2-12.5

≥ 899

≥ 11.3

≥ 1114

≥ 14

287-310

36-39

100

40M

1250-1280

12.5-12.8

≥ 923

≥ 11.6

≥ 1114

≥ 14

302-326

38-41

100

42M

1280-1320

12.8-13.2

≥ 955

≥ 12.0

≥ 1114

≥ 14

318-342

40-43

100

45M

1320-1380

13.2-13.8

≥ 995

≥ 12.5

≥ 1114

≥ 14

342-366

43-46

100

48M

1360-1430

13.6-14.3

≥ 1027

≥ 12.9

≥ 1114

≥ 14

366-390

46-49

100

50M

1400-1450

14.0-14.5

≥ 1033

≥ 13.0

≥ 1114

≥ 14

382-406

48-51

100

30H

1080-1130

10.8-11.3

≥ 796

≥ 10.0

≥ 1353

≥ 17

223-247

28-31

120

33H

1130-1170

11.3-11.7

≥ 836

≥ 10.5

≥ 1353

≥ 17

247-271

31-34

120

35H

1170-1220

11.7-12.2

≥ 868

≥ 10.9

≥ 1353

≥ 17

263-287

33-36

120

38H

1220-1250

12.2-12.5

≥ 899

≥ 11.3

≥ 1353

≥ 17

287-310

,36-39<,/P>

120

40H

1250-1280

12.5-12.8

≥ 923

≥ 11.6

≥ 1353

≥ 17

302-326

38-41

120

42H

1280-1320

12.8-13.2

≥ 955

≥ 12.0

≥ 1353

≥ 17

318-342

40-43

120

45H

1320-1360

13.2-13.6

≥ 963

≥ 12.1

≥ 1353

≥ 17

342-366

43-46

120

48H

1370-1430

13.7-14.3

≥ 995

≥ 12.5

≥ 1353

≥ 17

366-390

46-49

120

30SH

1080-1130

10.8-11.3

≥ 804

≥ 10.1

≥ 1592

≥ 20

223-247

28-31

150

33SH

1130-1170

11.3-11.7

≥ 844

≥ 10.6

≥ 1592

≥ 20

247-271

31-34

150

35SH

1170-1220

11.7-12.2

≥ 876

≥ 11.0

≥ 1592

≥ 20

263-287

33-36

150

38SH

1220-1250

12.2-12.5

≥ 907

≥ 11.4

≥ 1592

≥ 20

287-310

36-39

150

40SH

1250-1280

12.5-12.8

≥ 939

≥ 11.8

≥ 1592

≥ 20

302-326

38-41

150

42SH

1280-1320

12.8-13.2

≥ 987

≥ 12.4

≥ 1592

≥ 20

318-342

40-43

150

45SH,

1320-1380

13.2-13.8

≥ 1003

≥ 12.6

≥ 1592

≥ 20

342-366

43-46

150

28UH

1020-1080

10.2-10.8

≥ 764

≥ 9.6

≥ 1990

≥ 25

207-231

26-29

180

30UH

1080-1130

10.8-11.3

≥ 812

≥ 10.2

≥ 1990

≥ 25

223-247

28-31

180

33UH

1130-1170

11.3-11.7

≥ 852

≥ 10.7

≥ 1990

≥ 25

247-271

31-34

180

35UH

1180-1220

11.8-12.2

≥ 860

≥ 10.8

≥ 1990

≥ 25

263-287

33-36

180

38UH

1220-1250

12.2-12.5

≥ 876

≥ 11.0

≥ 1990

≥ 25

287-310

36-39

180

40UH

1240-1280

12.5-12.8

≥ 899

≥ 11.3

≥ 1990

≥ 25

302-326

38-41

180

28EH

1040-1090

10.4-10.9

≥ 780

≥ 9.8

≥ 2388

≥ 30

207-231

26-29

200

30EH

1080-1130

10.8-11.3

≥ 812

≥ 10.3

≥ 2388

≥ 30

223-247

28-31

200

33EH

1130-1170

11.3-11.7

≥ 836

≥ 10.5

≥ 2388

≥ 30

247-271

31-34

200

35EH

1170-1220

11.7-12.2

,

≥ 876

≥ 11.0

≥ 2388

≥ 30

263-287

33-36

200

38EH

1220-1250

12.2-12.5

≥ 899

≥ 11.3

≥ 2388

≥ 30

287-310

36-39

200

28AH

1040-1090

10.4-10.9

≥ 787

≥ 9.9

≥ 2624

≥ 33

207-231

26-19

230

30AH

1080-1130

10.8-11.3

≥ 819

≥ 10.3

≥ 2624

≥ 33

223-247

28-31

230

33AH

1130-1170

11.3-11.7

≥ 843

≥ 10.6

≥ 2624

≥ 33

247-271

31-34

230

 
 
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