Bonded NdFeB Magnets

PRODUCT STANDARD

DESCRIPTION OF PRODUCTS

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.
Bonded NdFeB Magnets
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DESCRIPTION OF PRODUCTS

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

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 customerˇŻs specified properties.

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.

 

 

Bonded NdFeB Magnets (Injection Molded)
Typical Magnetic Properties

  

Grade

Max. Energy Product

Remanence

Coercive Force

Rev. Temp. Coeff.

Working Temp.

Density

(BH)max

Br

Hc

Hci

Bd

Hd

Tc

D

MGOe

kJ/m3

T

kOe

kA/m

kOe

kA/m

%/°C

%/°C

°C

g/cm3

BNI-2

0.8-3.0

6.4-24

0.2-0.4

1.5-3.0

120-240

7.0-9.0

560-720

-0.15

-0.40

130

3.5-4.0

BNI-4

3.5-4.5

28-36

0.4-0.49

3.1-3.9

247-310

7.2-9.2

573-732

-0.10

-0.40

180

4.0-5.0

BNI-6

5.2-7.0

42-56

0.49-0.57

3.9-4.8

312-382

8.0-10.0

637-796

-0.10

-0.40

150

5.0-5.5

BNI-8

7.4-8.4

59-67

0.57-0.63

4.8-5.4

382-430

8.5-10.5

676-835

-0.10

-0.40

150

5.0-5.5

BNI-6H

5.0-6.5

40-52

0.48-0.56

4.2-5.0

334-398

13.0-17.0

1035-1353

-0.15

-0.4

180

5.0-5.5

 

 

Bonded NdFeB Magnets(Compression Bonded) 
Typical Magnetic Properties

  

Grade

Max. Energy Product

Remanence

Coercive Force

Rev. Temp.
Coeff.

Working Temp.

Density

(BH)max

Br

Hc

Hci

Bd

Hd

Tw

D

MGOe

kJ/m3

T

kOe

kA/m

kOe

kA/m

%/°C

%/°C

°C

g/cm3

BNP-6

5.0-7.0

40-56

0.52-0.60

3.8-4.5

304-360

8.0-10

640-800

-0.10

-0.40

140

5.3-5.8

BNP-8

7.0-9.0

56-72

0.60-0.65

4.5-5.5

360-440

8.0-12

640-960

-0.10

-0.40

140

5.6-6.0

BNP-10

9.0-10.0

72-80

0.65-0.70

4.5-5.8

360-464

8.0-12

640-960

-0.10

-0.40

120

5.8-6.1

BNP-12

10.0-12.0

80-96

0.70-0.76

5.8-6.0

424-480

8.0-11

640-880

-0.10

-0.40

130

6.0-6.2

BNP-8H

6.0-9.0

48-72

0.55-0.62

5.0-6.0

400-480

12-16

960-1280

-0.07

-0.40

120

5.6-6.0

 

 

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