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Neodymium Iron Boron (NdFeB) magnets are of the Rare Earth class, have been commercially available since the mid -1980's.  Their popularity has grown rapidly due to their high Maximum Energy Product and their wide range of available shapes, sizes, and grades.  NdFeB magnets can be manufactured by sintering, compression bonding, injection moulding, and extrusion.  The sintered form holds the highest energy product of up to 48MGOe, while the bonded form holds a lower energy product of up to 10MGOe.  The majority of NdFeB magnets are anisotropic and can only be magnetised in the orientation direction.  In general, magnetising fields of approximately 30KOe are required to saturate NdFeB magnets.  These magnets are prone to corrosion in humid environments.  For this, liquid epoxy, dry epoxy, nickel plating, zinc plating, and combinations of these coatings may be used as a protective measure.

Surface Treatment Method: Zinc, Nickel, Tin, Phosphor, Silver or Gold Plating Spray Coating Epoxy Resin.

Typical Magnetic Performance For Sintered NdFeB Magnet

Grade

Br

Hcb

Hcj

BHmax

Density

Tw Max

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

g/cm3

N27

10.3-10.8

1030-1080

≥10.0

≥796

≥12

≥955

199-231

25-29

7.5

80

N30

10.8-11.3

1080-1130

≥10.0

≥796

≥12

≥955

223-247

28-31

7.5

80

N33

11.3-11.7

1130-1170

≥10.5

≥836

≥12

≥955

247-271

31-34

7.5

80

N35

11.7-12.2

1170-1220

≥10.9

≥868

≥12

≥955

263-287

33-36

7.5

80

N38

12.2-12.5

1220-1250

≥11.3

≥899

≥12

≥955

287-310

36-39

7.5

80

N40

12.5-12.8

1250-1280

≥11.4

≥907

≥12

≥955

302-326

38-41

7.5

80

N42

12.8-13.2

1280-1320

≥11.5

≥915

≥12

≥955

318-342

40-43

7.5

80

N45

13.2-13.8

1320-1380

≥11.6

≥923

≥12

≥ 955

342-366

43-46

7.5

80

N48

13.8-14.2

1380-1420

≥11.6

≥923

≥12

≥876

366-390

46-49

7.5

80

N50

14.0-14.5

1400-1450

≥10.0

≥796

≥11

≥876

382-406

48-51

7.5

80

N52

14.3-14.8

1430-1480

≥10.0

≥796

≥11

≥876

398-422

50-53

7.5

80

30H

10.8-11.3

1080-1130

≥10.0

≥796

≥17

≥1353

223-247

28-31

7.5

120

33H

11.3-11.7

1130-1170

≥10.5

≥836

≥17

≥1353

247-271

31-34

7.5

120

35H

11.7-12.2

1170-1220

≥10.9

≥868

≥17

≥1353

263-287

33-36

7.5

120

38H

12.2-12.5

1220-1250

≥11.3

≥899

≥17

≥1353

287-310

36-39

7.5

120

40H

12.5-12.8

1250-1280

≥11.6

≥923

≥17

≥1353

302-326

38-41

7.5

120

42H

12.8-13.2

1280-1320

≥12.0

≥955

≥17

≥1353

318-342

40-43

7.5

120

45H

13-13.6

1300-1360

≥12.1

≥963

≥17

≥1353

326-358

43-46

7.5

120

48H

13.7-14.3

1370-1430

≥12.5

≥995

≥17

≥1353

366-390

46-49

7.5

120

Note: Additional Neodymium Iron Boron grades, including bonded versions, are available, contact our sales department

Bonded NdFeB magnets are produced by binding rapid-quenching Nd-Fe-B powders which is mixed with plastic resin to form a magnet by compression moulding with epoxy and injection moulding with nylon.  The injection moulding has particularly useful feature in moulding very complicated shapes and thin walled parts.  The compression moulded magnets are limited for simple geometries, but they can offer higher magnetic strength than injection moulded magnets because of relative high density.  Bonded NdFeB have lower energy properties compared with sintered NdFeB. However, it can be produced with high dimension accuracy and shape complexity.  Normally, there is no finishing required for bonded NdFeB.  In order to prevent corrosion, the magnet surfaces are treated by epoxy coating or nickel plating.

 
Stratton Products Ltd.
 

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