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              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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