permanent magnet

Bonded Magnets

permanent magnet

Bonded Magnets

Bonded magnets
Bonded magnets are a distinctive class of magnetic materials created by combining magnetic powder with a binding agent. This mixture is precisely molded under controlled pressure and then cured at temperatures between 150 and 175°C. The shape and dimensions of the resulting magnets are determined by the mold, allowing for one-step production without the need for secondary machining. These magnets offer several key benefits, including excellent magnetic performance, precise dimensional accuracy, versatility in shaping, outstanding resistance to corrosion, a variety of magnetization options, and suitability for mass production, which ensures high manufacturing efficiency.
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Magnetic Properties

Grade

Br

Hcb

Hcj

(BH)max

αBr

Tc

Tw

Density

Hardness

mT

kGs

kA/m

kOe

kA/m

kOe

kJ/m3

MGOe

%/°C

°C

°C

g/cm3

HRB

CMN-2

300-400

3.0-4.0

160-240

2.0-3.0

480-640

6.0-8.0

16-24

2.0-3.0

-0.11

350

≤160

4.5-5.0

40-45

CMN-4

400-500

4.0-5.0

240-320

3.0-4.0

560-720

7.0-9.0

32-44

4.0-5.5

-0.11

350

≤160

5.2-5.7

40-45

CMN-6

500-600

5.0-6.0

320-400

4.0-5.0

560-720

7.0-9.0

48-60

6.0-7.5

-0.11

350

≤160

5.5-6.0

40-45

CMN-8

600-680

6.0-6.8

360-440

4.5-5.5

640-800

8.0-10.0

60-72

7.5-9.0

-0.11

350

≤160

5.8-6.1

35-38

CMN-8H

600-650

6.0-6.5

400-480

5.0-6.0

1040-1360

13.0-17.0

60-68

7.5-8.5

-0.12

300

≤160

5.8-6.1

35-38

CMN-8SR

600-650

6.0-6.5

400-480

5.0-6.0

800-1120

10.0-14.0

60-68

7.5-8.5

-0.13

300

≤180

5.8-6.1

35-38

CMN-8L

600-800

6.0-6.8

400-480

5.0-6.0

640-800

8.0-10.0

64-72

8.0-9.0

-0.12

300

≤160

5.8-6.1

35-38

CMN-10

680-730

6.8-7.3

400-480

5.0-6.0

640-800

8.0-10.0

76-84

9.5-10.5

-0.1

350

≤160

5.8-6.1

35-38

CMN-10H

700-750

7.0-7.5

400-480

5.0-6.0

640-800

8.0-10.0

80-88

10.0-11.0

-0.1

350

≤160

6.0-6.3

35-38

CMN-12

720-770

7.2-7.7

440-520

5.5-6.5

720-880

9.0-11.0

88-96

11.0-12.0

-0.1

350

≤160

6.0-6.3

35-38

CMN-12D

720-770

7.2-7.7

440-520

5.5-6.5

720-880

9.0-11.0

88-96

11.0-12.0

-0.08

400

≤170

6.0-6.3

35-38

CMN-12L

760-810

7.6-8.1

400-480

5.0-6.0

480-640

6.0-8.0

88-96

11.0-12.0

-0.11

320

≤150

6.0-6.3

35-38

CMN-13L

780-830

7.8-8.3

400-480

5.0-6.0

480-640

6.0-8.0

88-104

11.0-13.0

-0.11

320

≤150

6.1-6.4

35-38

Notes: CMN-*(H/D or L)

CMN: Indicates that mould pressing, magnetic powder material is MQ patent product.

*: Indicates that (BH)max typical values is *MGOe.

H/D: Indicates that intrinsic coercive force is high.

L: Indicates that intrinsic coercive force is low.

Result Of Soak Test 25°C X 100 Hours

Solvent

Size

Weight

Flux Loss

Appearance

D.I.Water

±0.5%

±0.5%

±0.5%

No Rusting

Water

±0.5%

±0.5%

±0.5%

No Rusting

NaCI

±0.5%

±0.5%

±0.5%

Slight Rusting

0.4% NaOH

±0.5%

±0.5%

±0.5%

No Rusting

6% HNO3

±0.5%~2.5%

±0.5%

±0.5%~2.5%

Slight Rusting

Epoxy

±0.5%

±0.5%

±0.5%

No Rusting

H2S

±0.5%

±0.5%

±0.5%

No Rusting

Acetone

±0.5%

±0.5%

±0.5%

No Rusting

Machine Oil 30#

±0.5%

±0.5%

±0.5%

No Rusting

Gasoline

±0.5%

±0.5%

±0.5%

No Rusting

Application

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The primary application domain for bonded magnets is in miniature electric motors, including a wide variety of motor types such as spindle motors, stepper motors, synchronous motors, DC motors, and brushless DC motors. Notably, they can effectively act as partial substitutes for sintered NdFeB and ferrite magnets, streamlining the motor assembly process, enhancing reliability, reducing overall production costs, and optimizing efficiency across a range of applications.

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