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      1. 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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