Sintered Neodymium Iron Boron (NdFeB), the most powerful Rare Earth magnet available today, possesses high energranging from 8MGOe to 52MGOe 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

Manufacturing Method:
Sintered NdFeB Magnet —fine NdFeB powder is compacted in a die and then sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing (which involves a hard die into which the powder is placed and then pressed), and isostatic pressing (involving a special "rubber" die into which powder is placed and then pressed with equal force in all directions on the powder). Die pressed parts are usually made smaller than isostatically pressed parts. Although the magnetic properties of isostatically pressed parts are higher, the uniformity of magnetic characteristics is usually lower than that of die pressed parts. Sintered parts normally need some finish machining in order to meet final tolerances.

Machining:
Some machining operations may be performed on NdFeB materials using carbide tools, although surface finishes thus obtained may be less than optimal. In general, NdFeB magnets must be machined using diamond-grinding techniques. We are fully equipped to machine these materials to your blueprint specifications.

Magnetizing and Handling:
Rare Earth materials are mechanically weak, and magnetically very strong. They must therefore be handled very carefully to avoid damage and injury to personnel handling the magnets.
All NdFeB magnets require extremely high magnetizing fields and special consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.

Temperature Effects:
Magnetic properties of NdFeB deteriorate rapidly above about 130°C, depending on the grade of material, and the permeance coefficient of the magnet in operation. The higher the permeance coefficient the magnet operates at, the higher the temperature it will withstand. High Hci NdFeB materials operating at a high permeance coefficient can operate to about 220°C.

Common Applications for Neodymium Iron Boron Magnets:
Holding systems requiring very high holding forces, high field yoke magnets, high performance stepper, DC, servo, linear, and voice coil motors, magnetic bearings, magnetic couplings, loudspeakers, Halbach arrays, headphones, microphones, magnetic separation, instrumentation, switches, relays, magnetic resonance, sputtering, vacuum deposition, charged particle beam guidance, particle accelerators, Undulators, Wigglers, and others.

Acoustics	Communcation equipment	Home appliance	IT industry
Motor assemblies	MRI	Transportion	Windmill

Shapes and Sizes Available:
In addition to the stock shapes, sizes, and grades listed, others are available. Please inquire. Non-standard shapes and sizes can be fabricated to blueprint specifications from raw stock.

Magnetic and Physical Properties

Sintered NdFeB Magnetic Properties
TYPE	Remanence Br		Coercive force bHc		Intrinsic coercive force iHc		Max. energy product (BH) max		Working MAGNETIC AND PHYSICAL CHARACTERISTICS (NdFeB) Temperature
TYPE	KGs	T	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	°C
N-30	10.8-11.2	1.08-1.12	9.8-10.5	780-836	≥12	≥955	28-30	223-239	≤80
N-33	11.4-11.7	1.14-1.17	10.5-11.0	836-876	≥12	≥955	31-33	247-263	≤80
N-35	11.7-12.1	1.17-1.21	10.8-11.5	860-915	≥12	≥955	33-35	263-279	≤80
N-36	11.9-12.2	1.19-1.22	10.8-11.5	860-915	≥12	≥955	34-36	271-287	≤80
N-38	12.2-12.6	1.22-1.26	10.8-11.5	860-915	≥12	≥955	36-38	287-303	≤80
N-40	12.6-12.9	1.26-1.29	10.5-11.0	836-876	≥12	≥955	38-40	303-318	≤80
N-42	12.9-13.2	1.29-1.32	10.5-11.0	836-876	≥12	≥955	40-42	318-334	≤80
N-43	13.0-13.3	1.30-1.33	10.5-11.0	836-876	≥12	≥955	41-43	326-342	≤80
N-45	13.3-13.7	1.33-1.37	10.5-11.0	836-876	≥12	≥965	43-45	342-358	≤80
N-48	13.8-14.2	1.38-1.42	≥10.5	≥835	≥12	≥955	46-49	366-390	≤80
N-50	13.8-14.5	1.38-1.45	≥10.5	≥835	≥11	≥955	47-51	374-406	≤80
N-52	14.3-14.8	1.43-1.48	≥10.8	≥860	≥11	≥876	50-53	398-422	≤80
N-27M	10.2-10.6	1.02-1.06	9.6-10.1	764-804	≥15	≥1194	25-27	199-215	≤100
N-30M	10.8-11.2	1.08-1.12	10.1-10.6	804-844	≥15	≥1194	28-30	223-239	≤100
N-33M	11.4-11.7	1.14-1.17	10.5-11.0	844-884	≥15	≥1194	31-33	247-263	≤100
N-35M	11.7-12.1	1.17-1.21	10.8-11.5	860-915	≥15	≥1114	33-35	263-279	≤100
N-36M	11.9-12.2	1.19-1.22	11.1-11.6	884-923	≥15	≥1194	34-36	271-287	≤100
N-38M	12.2-12.6	1.22-1.26	10.8-11.5	860-915	≥14	≥1114	36-38	287-303	≤100
N-40M	12.6-12.9	1.26-1.29	10.8-11.5	860-915	≥14	≥1114	38-40	303-318	≤100
N-42M	12.9-13.2	1.29-1.32	10.8-11.4	860-907	≥14	≥1114	40-42	318-334	≤100
N-45M	13.3-13.7	1.33-1.37	10.8-11.4	860-907	≥17	≥1114	43-45	334-358	≤100
N-48M	13.6-14.0	1.36-1.40	≥11.8	≥939	≥14	≥1114	46-49	366-390	≤100
N-50M	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥14	≥1114	48-51	382-406	≤100
N-27H	10.2-10.6	1.02-1.06	9.6-10.1	764-804	≥17	≥1353	25-27	199-215	≤120
N-30H	10.8-11.2	1.08-1.12	10.1-10.6	804-844	≥17	≥1353	28-30	223-239	≤120
N-33H	11.4-11.7	1.14-1.17	10.6-11.1	844-884	≥17	≥1353	31-33	247-263	≤120
N-35H	11.7-12.1	1.17-1.21	10.8-11.5	860-915	≥17	≥1353	33-35	263-279	≤120
N-36H	11.9-12.2	1.19-1.22	11.1-11.6	884-923	≥17	≥1353	34-36	271-287	≤120
N-38H	12.2-12.6	1.22-1.26	11.5-12.0	915-955	≥17	≥1353	36-38	287-303	≤120
N-40H	12.6-12.9	1.26-1.29	11.5-12.0	915-955	≥17	≥1353	38-40	303-318	≤120
N-42H	12.9-13.2	1.29-1.32	11.5-12.0	915-955	≥17	≥1353	40-42	318-334	≤120
N-45H	13.2-13.8	1.32-1.38	≥12.0	955	≥17	≥1353	42-46	335-366	≤120
N-46H	13.3-13.8	1.33-1.38	≥12.2	972	≥16	≥1274	44-47	350-374	≤120
N-48H	13.6-14.3	1.36-1.43	≥12.5	995	≥16	≥1274	46-49	366-390	≤120
N-27SH	10.2-10.6	1.02-1.06	9.6-10.1	764-804	≥20	≥1592	25-27	199-215	≤150
N-30SH	10.8-11.2	1.08-1.12	10.1-10.6	804-844	≥20	≥1592	28-30	223-239	≤150
N-33SH	11.4-11.7	11.4-11.7	10.6-11.1	844-884	≥20	≥1592	31-33	247-263	≤150
N-35SH	11.7-12.1	1.17-1.21	10.8-11.5	860-915	≥20	≥1595	33-35	263-279	≤150
N-38SH	12.1-12.5	1.21-1.25	10.8-11.5	860-915	≥20	≥1592	36-38	287-302	≤150
N-40SH	12.6-12.9	1.26-1.29	10.8-11.5	860-915	≥20	≥1592	38-40	303-318	≤150
N-42SH	12.8-13.2	1.28-1.32	≥11.8	≥939	≥20	≥1672	40-43	320-343	≤150
N-45SH	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥20	≥1592	43-46	342-366	≤150
N25UH	9.8-10.2	0.98-1.02	9.2-9.6	732-764	≥25	≥1990	23-25	183-199	≤180
N28UH	10.4-10.8	1.04-1.08	9.8-10.2	780-812	≥25	≥1990	26-28	207-223	≤180
N30UH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥25	≥1990	28-31	223-247	≤180
N35UH	11.7-12.1	1.17-1.21	10.5-11.2	836-890	≥25	≥1989	33-35	263-278	≤180
N38UH	12.1-12.5	1.21-1.25	≥11.4	≥907	≥25	≥1990	36-39	287-310	≤180
N40UH	12.5-12.8	1.25-1.28	≥11.4	≥907	≥25	≥1990	38-41	302-326	≤180
N28EH	10.4-10.8	1.04-1.08	9.8-10.2	780-812	≥30	≥2387	26-28	207-223	≤200
N30EH	10.8-11.2	1.08-1.12	10.1-10.6	804-844	≥30	≥2387	28-30	223-239	≤200
N35EH	11.7-12.1	1.17-1.21	≥10.2	≥812	≥30	≥2388	33-36	263-287	≤200
N38EH	12.1-12.5	1.21-1.25	≥11.4	≥907	≥30	≥2388	36-39	287-310	≤200
N30AH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥35	≥2785	28-32	223-255	≤220
N33AH	11.2-11.7	1.12-1.17	≥10.2	≥812	≥35	≥2785	31-34	247-271	≤220

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 temperature ≤5%

Other Physical Properties (Sintered NdFeB)
Temp.Coeff.of Br:	-0.11%/°C	Temp.Coeff.of iHc:	-0.60%/°C
Density:	7.4~7.6g/cm³	Electrical Resistivity:	144µΩcm
Vickers Hardness:	600HV	Flexural Strength:	25kg/mm
Tensile Strength:	8kg/mm²	Coef. of Thermal Expansion:	4×10^-6/°C
Specific Heat:	0.12kcal/(kg.°C)	Thermal conductivity:	7.7kcal/m.h.°C
Young's Modulus:	1.6×10¹¹N/m²	Rigidity:	0.64N/m²
Poisson's Ratio:	0.24	Compressibility:	9.8x10^-12m²/N
Curie Temperature:	310~340°C

NdFeB Magnet

Sintered NdFeB Magnet

NdFeB Magnet

Magnetic and Physical Properties

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