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.

Magnetic Properties

Grade	Br		Hcb		Hcj		(BH)max		αBr	Tc	Tw	Density	Hardness
Grade	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

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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