Neodymium magnets
Category: Magnets  Publish Time: 2013-08-19 09:54 

Neodymium magnets
Sintered Neodymium Iron Boron (NdFeB) magnets offer the highest energy per unit volume of any permanent magnet material, mostly an iron based alloy.

 

Neodymium magnets

 

 Sintered Neodymium Iron Boron (NdFeB) magnets offer the highest energy per unit volume of any permanent magnet material, mostly an iron based alloy. It is manufactured in numerous energy and temperature grades, with high energy range from 33MGOe to 48MGOe with wonderful coercive

force, even 50MGOe in the laboratory. Being less prone to chipping during handling, and has lowertemperature coefficient of magnetic properties than Ceramic magnets, higher than SmCo type rare earth magnets, but less expensive, and mechanically stronger and less brittle than SmCo. However, being mostly an iron based alloy, NdFeB type rare earth magnet is much more prone tosurface oxidation or rust. To eliminate such a problem, the user should consider magnet coating,plating, or suitable surface treatment. So for most applications, coating or plating is recommended.And also, Because of the brittle nature and high attractive forces generated by NdFeB magnets,

great care is needed during handling.Permanent NdFeB magnets are widely used in apparatus, instruments, assemblies where a strongmagnetic field is needed, such as motors, sensors, microphones, electro-acoustics, magnetic separation, magnetic suckers and magnetic therapy wraps.

  

Magnetic Properties of Sintered NdFeB Magnets

 

Grade

Br

Hcb

Hcj

(BH)max

Working temperature

T

KA/m

KA/m

Kj/m3

℃

KG

KOe

KOe

MGOe

N35

1.18-1.22

860-907

≥955

263-287

≤80

11.8-12.2

10.8-11.4

≥12

33-36

N38

1.22-1.26

860-907

≥955

287-303

≤80

12.2-12.6

10.8-11.4

≥12

36-38

N40

1.26-1.29

860-907

≥955

303-318

≤80

12.6-12.9

10.8-11.4

≥12

38-40

N42

1.29-1.33

860-907

≥955

318-342

≤80

12.9-13.3

10.8-11.4

≥12

40-43

N45

1.33-1.37

863-907

≥955

342-366

≤80

13.3-13.7

10.5-11.4

≥12

43-46

N48

1.37-1.41

716-836

≥836

366-390

≤80

13.7-14.1

9-10.5

≥10.5

46-49

N50

1.41-1.45

860-907

≥836

390-406

≤80

14.1-14.5

10.8-11.4

≥10.5

49-51

N35M

1.18-1.22

860-907

≥1114

263-287

≤100

11.8-12.2

10.8-11.4

≥14

33-36

N38M

1.22-1.26

860-907

≥1114

287-303

≤100

12.2-12.6

10.8-11.4

≥14

36-38

N40M

1.26-1.29

860-907

≥1114

303-318

≤100

12.6-12.9

10.8-11.4

≥14

38-40

N42M

1.29-1.33

860-907

≥1114

318-342

≤100

12.9-13.3

10.8-11.4

≥14

40-43

N45M

1.33-1.37

860-907

≥1114

342-366

≤100

13.3-13.7

10.8-11.4

≥14

43-46

N48M

1.37-1.41

860-907

≥1114

366-390

≤100

13.7-14.1

10.8-11.4

≥14

46-49

N33H

1.14-1.18

820-876

≥1353

247-263

≤120

11.4-11.8

10.3-11

≥17

31-33

N35H

1.18-1.22

876-907

≥1353

263-287

≤120

11.8-12.2

11-11.4

≥17

33-36

N38H

1.22-1.26

890-940

≥1353

287-303

≤120

12.2-12.6

11.2-11.8

≥17

36-38

N40H

1.26-1.29

916-995

≥1353

303-318

≤120

12.6-12.9

11.5-12.5

≥17

38-40

N42H

1.29-1.33

939-995

≥1353

318-342

≤120

12.9-13.3

11.8-12.5

≥17

40-43

N44H

1.33-1.35

956-1035

≥1353

342-358

≤120

13.3-13.5

39064

≥17

43-45

N46H

1.35-1.38

956-1035

≥1353

358-374

≤120

13.5-13.8

39064

≥17

45-47

N33SH

1.14-1.18

820-876

≥1592

247-263

≤150

11.4-11.8

10.3-11

≥20

31-33

N35SH

1.18-1.22

860-907

≥1592

263-287

≤150

11.8-12.2

10.8-11.4

≥20

33-36

N38SH

1.22-1.26

860-907

≥1592

287-303

≤150

12.2-12.6

10.8-11.4

≥20

36-38

N40SH

1.26-1.29

860-907

≥1592

303-318

≤150

12.6-12.9

10.8-11.4

≥20

38-40

N42SH

1.29-1.33

860-907

≥1592

318-342

≤150

12.9-13.3

10.8-11.4

≥20

40-43

N44SH

1.33-1.35

860-907

≥1592

342-358

≤150

13.3-13.5

10.8-11.4

≥20

43-45

N30UH

1.08-1.14

804-844

≥1989

223-247

≤180

10.8-11.4

10.1-10.6

≥25

28-31

N33UH

1.14-1.18

820-876

≥1989

247-263

≤180

11.4-11.8

10.3-11

≥25

30-33

N35UH

1.18-1.22

860-907

≥1989

263-287

≤180

11.8-12.2

10.8-11.4

≥25

33-36

N38UH

1.22-1.26

860-907

≥1989

287-303

≤180

12.2-12.6

10.8-11.4

≥25

36-38

N30EH

1.08-1.14

804-844

≥2387

223-247

≤200

10.8-11.4

10.1-10.6

≥30

28-31

N33EH

1.14-1.18

820-876

≥2388

247-263

≤200

11.4-11.8

10.3-11

≥30

31-33

N35EH

1.18-1.22

836-907

≥2388

263-287

≤200

11.8-12.2

10.5-11.4

≥30

33-36

　

Demagnetization curve of several sintered NdFeB magnets at different temperatures

　

 

 

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