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Home > Products > NdFeB Magnet
NdFeB Magnet

Neodymium-Iron-Boron,

General Description
NdFeB Rare Earth Magnets

Rare Earth Magnets are including Neodymium(Nd) -Iron(Fe)-Boron(B) types and Samarium(Sm)- Cobalt(Co) classes. The most commonly produced material is neodymium-iron-boron (NdFeB). This group of magnetic materials provides the highest available magnetic energies of any material. NdFeB magnets allow small shapes and sizes with high magnetic fields. Energy product range from 26 MGOe to about 45 MGOe.

Super-Strength Rare Earth Magnet----Sintered NdFeB magnets, have the characteristics of :

*Extreme strong Br Resident induction.

*Excellent demagnetization resistance capability.

*Good Price relative to its high magnetic properties.

*Coating is needed for NdFeB

Surface Treatment Method: Type Information

Metallic Zinc, Nickel, Nickel+Nickel, Copper+Nickel, Nickel+Copper+Nickel,

Gold, Organic Epoxy, Nickel+Epoxy coating

Temporary Surface: Passivation

Both NdFeB and SmCo are available in sintered as well as bonded forms. Sintered NdFeB parts however, will produce the highest magnetic properties. NdFeB is sensitive to heat and should not be used in the environments that exceed 200. Bonded NdFeB are generally low in properties due to the special process of gluing the powder in a mold. The bonded form of the material can be produced with close tolerance off tools with little or no finishing required. The sintered form usually some finishing operations in order to hold close mechanical tolerances.

Sintered NdFeB Magnet

Sintered NdFeB Magnet

Neodymium Iron Boron (NdFeB), the most powerful y Rare Earth magnet available today, possesses high energranging from 8MGOe to 48MGOe and wonderful coercive force. As the third generation of Rare Earth permanent magnet, NdFeB products are quite a bit less expensive, and are mechanically stronger and less brittle than SmCo, also density of NdFeB products is about 13% smaller than SmCo products. Because NdFeB magnets are more prone to oxidation than any other magnet alloy, for most applications, coating or plating the magnets is recommended.

Super-Strength Rare Earth Magnet----Sintered NdFeB magnets, have the characteristics of :

*Extreme strong Br Resident induction.
*Excellent demagnetization resistance capability.
*Good Price relative to its high magnetic properties.
*Coating is needed for NdFeB
Surface Treatment Method: Type Information
Metallic Zinc, Nickel, Nickel+Nickel, Copper+Nickel, Nickel+Copper+Nickel,
Gold, Organic Epoxy, Nickel+Epoxy coating
Temporary Surface: Passivation

MAGNETIC AND PHYSICAL CHARACTERISTICS (NdFeB)


TYPE

Remanence
Br

Coercivforce
bHc

Intrinsic coercive force iHc

Max. energy product
(BH) max

Working Temperature

KGs

T

KOe

KA/m

KOe

KA/m

MGOe

KJ/m³

1 N-30

10.8-11.2

1.08-1.12

9.8-10.5

780-836

≥12

≥955

28-30

223-239

80

2 N-33

11.4-11.7

1.14-1.17

10.5-11.0

836-876

≥12

≥955

31-33

247-263

80

3 N-35

11.7-12.1

1.17-1.21

10.8-11.5

860-915

≥12

≥955

33-35

263-279

80

4 N-36

11.9-12.2

1.19-1.22

10.8-11.5

860-915

≥12

≥955

34-36

271-287

80

5 N-38

12.2-12.6

1.22-1.26

10.8-11.5

860-915

≥12

≥955

36-38

287-303

80

6 N-40

12.6-12.9

1.26-1.29

10.5-11.0

836-876

≥12

≥955

38-40

303-318

80

7 N-42

12.9-13.2

1.29-1.32

10.5-11.0

836-876

≥12

≥955

40-42

318-334

80

8 N-43

13.0-13.3

1.30-1.33

10.5-11.0

836-876

≥12

≥955

41-43

326-342

80

9 N-45

13.3-13.7

1.33-1.37

10.5-11.0

836-876

≥12

≥965

43-45

342-358

80

10 N-27M

10.2-10.6

1.02-1.06

9.6-10.1

764-804

≥15

≥1194

25-27

199-215

100

11 N-30M

10.8-11.2

1.08-1.12

10.1-10.6

804-844

≥15

≥1194

28-30

223-239

100

12 N-33M

11.4-11.7

1.14-1.17

10.5-11.0

844-884

≥15

≥1194

31-33

247-263

100

13 N-35M

11.7-12.1

1.17-1.21

10.8-11.5

860-915

≥15

≥1114

33-35

263-279

100

14N-36M

11.9-12.2

1.19-1.22

11.1-11.6

884-923

≥15

≥1194

34-36

271-287

100

15 N-38M

12.2-12.6

1.22-1.26

10.8-11.5

860-915

≥14

≥1114

36-38

287-303

100

16 N-40M

12.6-12.9

1.26-1.29

10.8-11.5

860-915

≥14

≥1114

38-40

303-318

100

17 N-42M

12.9-13.2

1.29-1.32

10.8-11.4

860-907

≥14

≥1114

40-42

318-334

100

18 N45M

13.3-13.7

1.33-1.37

10.8-11.4

860-907

≥17

≥1114

43-45

334-358

100

19 N-27H

10.2-10.6

1.02-1.06

9.6-10.1

764-804

≥17

≥1353

25-27

199-215

120

20 N-30H

10.8-11.2

1.08-1.12

10.1-10.6

804-844

≥17

≥1353

28-30

223-239

120

21 N-33H

11.4-11.7

1.14-1.17

10.6-11.1

844-884

≥17

≥1353

31-33

247-263

120

22 N-35H

11.7-12.1

1.17-1.21

10.8-11.5

860-915

≥17

≥1353

33-35

263-279

120

23 N-36H

11.9-12.2

1.19-1.22

11.1-11.6

884-923

≥17

≥1353

34-36

271-287

120

24 N-38H

12.2-12.6

1.22-1.26

11.5-12.0

915-955

≥17

≥1353

36-38

287-303

120

25 N-40H

12.6-12.9

1.26-1.29

11.5-12.0

915-955

≥17

≥1353

38-40

303-318

120

26 N-42H

12.9-13.2

1.29-1.32

11.5-12.0

915-955

≥17

≥1353

40-42

318-334

120

27N-27SH

10.2-10.6

1.02-1.06

9.6-10.1

764-804

≥20

≥1592

25-27

199-215

150

28N-30SH

10.8-11.2

1.08-1.12

10.1-10.6

804-844

≥20

≥1592

28-30

223-239

150

29N-33SH

11.4-11.7

11.4-11.7

10.6-11.1

844-884

≥20

≥1592

31-33

247-263

150

30N-35SH

11.7-12.1

1.17-1.21

10.8-11.5

860-915

≥20

≥1595

33-35

263-279

150

31N-38SH

12.1-12.5

1.21-1.25

10.8-11.5

860-915

≥20

≥1592

36-38

287-302

150

32N-40SH

12.6-12.9

1.26-1.29

10.8-11.5

860-915

≥20

≥1592

38-40

303-318

150

33N25UH

9.8-10.2

0.98-1.02

9.2-9.6

732-764

≥25

≥1990

23-25

183-199

180

34N28UH

10.4-10.8

1.04-1.08

9.8-10.2

780-812

≥25

≥1990

26-28

207-223

180

35N30UH

10.8-11.2

1.08-1.12

10.1-10.6

804-844

≥25

≥1990

28-30

223-239

180

36N35UH

11.7-12.1

1.17-1.21

10.5-11.2

836-890

≥25

≥1989

33-35

263-278

180

37N25EH

9.8-10.2

0.98-1.02

9.2-9.6

732-764

≥30

≥2387

23-25

183-199

200

38N28EH

10.4-10.8

1.04-1.08

9.8-10.2

780-812

≥30

≥2387

26-28

207-223

200

39N30EH

10.8-11.2

1.08-1.12

10.1-10.6

804-844

≥30

≥2387

28-30

223-239

200

Remark: The above mentioned data of magnetic and physical characteristics are given at room temperature

** The open flux irreversible loss of the testing sample at this temperature5%


Bonded NdFeB magnet

Bonded NdFeB magnets are manufactured by binding rapid-quenching NdFeB powder. The powder is mixed with resin to form a magnet by compression molding with epoxy or infection molding with nylon. The latter technique is particular effective in large volume production, though the magnetic value of products is lower than those made with compression molding because of their relatively lower density. Various shapes of high dimensional accuracy can be produced without further processing. Surface is treated by epoxy coating or nickel-plating to prevent corrosion

Other Properties of NdFeB Bonded Magnets

Hybrid magnets to create different magnetic properties

With different ratio of additives to NdFeB powder, magnetic properties of hybrid NdFeB magnets can be tuned in a wide range. Once the ratio is fixed, magnetic property fluctuation can still be limited in a narrow bank. Hybrid magnets will meet customers¡¯specified properties.

Characteristics for the initial magnetization of NdFeB bonded magnets

Rapidly quenched NdFeB powder used for bonded magnets is multi grain with grain size of sub-micron. Powder is isotropic in magnetic properties, which results in flat increasing of remanence and intrinsic coercivity with applied field. Magnet can only be magnetized to saturation in high fields.

Advantages of Bonded Magnet

*Produced with high efficiency, stability and repeatability.

*Magnet and other part may form together in one step.

*Free choice of magnetizing direction-especially for multi-polar applications

*High dimensional accuracy-large quantity applications with minimum post-press machining.

*Thin-wall ring and complex shape magnets.

*High resistance to corrosion.

Magnetic properties of bonded NdFeB Magnets

P/N

Br
Remanence

Hcj
Intrinsic Coercivity

Hcb
Coercive Force

(BH)max.
Maximum Energy Product

MT

kG

kA/m

kOe

kA/m

kOe

KJ/m3

MGOe

NdFeB-NB6

440-560

4.40-5.60

560-680

7.0-8.5

240-320

3.0-4.0

32-48

4.0-6.0

NdFeB-NB8

540-640

5.40-6.40

640-720

8.0-9.0

320-400

4.0-5.0

48-64

6.0-8.0

NdFeB-NB8M

540-620

5.40-6.20

1040-1360

13.0-17.0

384-464

4.8-5.8

56-72

7.0-9.0

NdFeB-NB10

620-700

6.20-7.00

608-800

7.6-10.0

360-456

4.5-5.7

64-80

8.0-10.0

NdFeB-NB12

690-760

6.90-7.60

640-840

8.0-10.5

400-480

5.0-6.0

80-96

10.0-12.0

Physical Chracteristics of bonded NdFeB Magnets

P/N


Recoil Permeability

Hs
Magnetizing Field

¦¯
Density

Temperature Coefficient

Tc
Curie Temperature

K[2]
Ring Crushing Strength

Coefficient of Thermal Expansion (25-200¡æ)

kA/m

g/cm3

kOe

%/

(Hcj)%/

kg/mm2

10-6/

NdFeB-NB6

1.22

1600

5.1-5.6

¡Ì20

-0.14

-0.40

360

5.5

4.8

NdFeB-NB8

1.22

1600

5.4-5.8

¡Ì20

-0.13

-0.40

360

5.5

4.8

NdFeB-NB8M

1.18

2000

5.8-6.0

¡Ì25

-0.12

-0.38

305

5.5

4.8

NdFeB-NB10

1.22

1600

5.8-6.0

¡Ì20

-0.11

-0.40

360

5.5

4.8

NdFeB-NB12

1.17

1600

5.9-6.1

¡Ì20

-0.11

-0.41

360

5.5

4.8

Note: [1] The properties given above are typical at room temperature(23)for uncoated samples.

[2] Ring Crushing Strength K is defined as follows, with the force applying along a diameter of magnet ring and P is the value at which the first crack appears. K=P(D-T)/LT2

K-Ring Crushing Strength(kg/mm2) P-Load on magnet ring(kg)

D-Outer diameter(mm) T-Ring thickness(mm)

L-Height of the ring(mm)

Demagnetization Curves of Bonded NdFeB Magnets

Safety Notes for the Use and Storage of Bonded Magnets.

*Do not place magnets near person wearing electrical medical equipment.such as pacemaker,because the magnet may result in malfunction of the equipment and endanger person's life.

*Keep magnets away from magnetic memory media or other magnetic field sensitive devices such as magnetic cards.tapes,floppy disks,hard disk drivers,and watches.Otherwise information stored in the media or the devices may be damaged.

*Big block of magnet will strongly attract each other or attract iron steel pieces,which may cause serious injure to person.

*Relatively weak in strength,bonded magnets may break into pieces when collide with other materials.Be careful in assembling magnets and prevent the finy fragments from entering into eyes or cause other injuries.

*Keep magnets in good condition and avoid following environment in case that magnets become rust or weaken in mechanical or magnetic strength.

A. With acid,alkali,organic solvent or electrolytes.

B. Immersed in water or in oil.

C. Space filled with hydrogen.

D. Space filled with corrosive gases such as Cl2,NH3,Nox,etc.

E. With radioactive rays.


Injection Bonded NdFeB Magnets Injection Plastic NdFeB magnet, a kind of new-generation composite material made from permanent magnetic powder and plastic, has outstanding magnetic properties and plastic properties and features high size precision and exceptional shock resistance. It can be processed into various components with complicated shapes,thus can be used in the industries of micro or special motor, office equipment, instrument, meter, and beeper. Custom design available.

CHARACTERISTICS

1) Design and manufacturing of orientation moulds were carried out
2) Having high dimensional precision and impact-resistance. Capable of forming products with inlay.
3) The injection moulding parts are suitable for forming products with various shapes and thin walls.
4) Multi polar magnetization can be carried out according customer' requirements

APPLICATIONS

*Different kind of micro-special motor
*Different kind of fan motor
*Different kind of DC motor
*Synchronization electric motor
*House electric apparatus
*Ice chipper electric motor
*Hand-operated electric generator
*Automobile motor
*Time gauge
*Instruments for auto


Physical Magnetic properties Of Injection NdFeB Bonded Magnet

P/N

NBI-4

NBI-6

NBI-6M

NBI-8

Br (mT)

400-490

490-570

480-560

570-630

bHc(kA/m)

256-312

312-384

336-400

382-430

iHc(kA/m)

576-736

640-800

960-1360

680-840

(BH)max(kJ/m3)

28-36

40-56

44-60

60-68

Recoil permeability

1.1-1.22

1.1-1.22

1.1-1.22

1.1-1.22

Recoil temperature coeffiient of Br. (%/)

-0.10
(15-100)

-0.09
(15-100)

-0.10
(15-100)

-0.10
(15-100)

Magnetizing field (Ka/m)

≥ 1592

≥1592

≥ 1990

≥1592

Density(g/cm3)

4.0-4.5

4.5-5.5

5.0-5.5

5.0-5.5

Ring crushing strength constant (N/mm2)

> 78

> 78

> 78

> 78

Typical Demagnetization curve of Injection NdFeB Magnet
Typical Demagnetization curve of Injection NdFeB Magnet

Temperature Characteristic Curve Of Injection NdFeB Magnet

Temperature Characteristic Curve Of Injection NdFeB Magnet

l Inspection standard for permanent magnet

l Purchasing Guide

l Permanent magnet supply direction

l Surface protection and surface coating for the permanent magnet

l Quality warranty

l Safety principle for manual operation of permanent magnet

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