Bonded NdFeB Magnets

Bonded NdFeB Magnets are composite permanent magnetic materials fabricated by mixing rapidlyquenchedNdFeB magnetic powders (MQ powders) or anisotropic magnetic powders processed by hydrogen decrepitation and disproportionation-desorption-recombination (HDDR) with polymer binders (such as epoxy resin and nylon), followedby molding processes including compression molding, extrusion molding and injection molding. They combine the high performanceof rare-earth permanent magnets with the easy machinability and capability of forming complex shapes of polymer materials.

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Hard Magnetic Cores

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Core Features

Uniform and consistent magnetic properties

Rmanence: Typically 0.6 –0.9 T (6 –9KGs), lower than that of sintered NdFeB. Magnets
Coercivity: Ultra-high intrinsic coercivity, generally reaching 800 –2000 kA/m (10 –25kOe) or higher. High magnetic induction coercivity.
Maximum magnetic energy product: Generally 40 –120 kJ/cm3 (5 – 15MGOe).

Mechanical and Physical Characteristics

Density: lower than that of sintered NaFeB magnets, approximately5.8 –6.5 g/cm³
Mechanical strength and toughness: Superior to brittle sintered NdFeB magnets, with excellent impact and fracture resistance.
Corrosion resistance: Inherent corrosion resistance is better than that of uncoated sintered NdFeB.
Good temperature stability: The operating temperature range of epoxy-bonded magnets generally reaches -40^oC - +150^oC.
High electric resistivity: Good insulation performance significantly reduces eddy current losses.

Processing and dimensional properties

Excellent shape complexity: extremely intricate, insert-integrated or high-precision 3D geometries can be produced via injection molding.
Very high dimensional accuracy and tight tolerances.

Typical Applications

Taking advantage of its merits including high shape flexibility, high precision, high resistivity, excellent consistency and moderate magnetic properties, it iswidely applied to micro precision motors, sensors and detectors, office automation equipment, auto parts, consumer electronics and other fields.

Sintered vs Bonded NdFeB Magnet Properties Comparison

Property	Sintered NdFeB	Bonded NdFeB
Remanence Br	10.0–15.8kGs (1.0-1.58T)	6.0 –12.0kGs (0.6 -1.2T)
Coercivity (Hcj)	High, 8.0-26.0kOe	Mid-low 6.0-15.0 kQe
(BH)max	Superior (26-55 MGOe)	Moderate (6-36 MGOe)
Operating Temp Range	High -40 ~ 200^oC	-40 ~ 150^oC, regular< 120^oC
Temperature stability	Good,low demagnetization rate	Moderate, easy demagnetization
Mechanical Strength	Hard & brittle, ceramic-like	Tough, machinable
Shape Complexity	Limited (Simple blocks)	Excellent (Complex 3D shape)
Dimensional Tolerance	Low, post-finishing needed	Excellent, one-step forming
Electrical Resistivity	Low (Conductive, eddy currents)	Very high (Insulating)
Corrosion Resistance	Poor (Requires coating)	Good (Polymer matrix protection)
Density	High (~7.5g/ cm³)	Low (~6.5g/ cm³)
Magnet Consistency	Good batch consistency, small individual variance	Excellent consistency, minimal individual difference
Magnetization	Multi-pole feasible, medium difficulty	Easy multi-pole, radial/axial composite available
Cost (Same Spec.)	Low material cost, High processing cost	High material cost, low processing cost

Product Matrix

The magnetic properties matrix of bonded NdFeB magnet:

Grade	Remanence		Coercivity		Intrinsic Coercitity		Max Magnetic Energy Product		Operating Temp
	Br		Hcb		Hcj		(BH)max		Operating Temp
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m3	MGOe	℃
FET-B-16M	0.67-0.72	6.7-7.2	412-490	5.2-6.2	713-792	9.0-10.0	81-84	10.3-10.7	120-160
FET-B-15M	0.65-0.70	6.5-7.0	410-475	5.0-6.0	673-752	8.5-9.5	76-80	9.7-10.1	120-150
FET-B-13M	0.62-0.65	6.2-6.5	365-443	4.6-5.6	635-712	8.0-9.0	68-72	8.8-9.1	100-130
FET-B-12M	0.60-0.64	6.0-6.4	348-428	4.4-5.4	554-675	7.0-8.5	65-68	8.2-8.6	100-130
FET-B-11M	0.59-0.63	5.9-6.3	330-410	4.2-5.2	554-635	7.0-8.0	60-64	7.6-8.0	100-120
FET-B-10M	0.58-0.62	5.8-6.2	320-400	4.0-5.0	554-635	7.0-8.0	55-58	7.0-7.4	100-120
FET-B-9M	0.56-0.61	5.6-6.1	300-380	3.8-4.8	515-600	6.5-7.5	51-54	6.4-6.8	90-120
FET-B-8M	0.56-0.60	5.6-6.0	285-360	3.6-4.6	435-515	5.5-6.5	45-50	5.8-6.2	80-110
FET-H-15M	0.68-0.73	6.8-7.3	400-440	5.0-5.5	544-624	6.8-7.8	77-81	9.7-10.2	100-120
FET-H-16M	0.70-0.76	7.0-7.6	416-480	5.2-6.0	544-624	6.8-7.8	82.4-86.4	10.3-10.8	100-120
FET-A-14M	0.64-0.68	6.4-6.8	440-488	5.5-6.1	920-1000	11.0-13.0	73.6-76	9.25-9.55	120-160
FET-A-1IM	0.59-0.64	5.9-6.4	392-440	4.9-5.5	960-1080	12.0-13.5	59-62	7.4-7.6	110-130

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