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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