Neodymium Magnets for sale(NdFeB Magnets)

NdFeB Rare Earth Permanent Magnet Overview

neodymium magnets for sale are the most powerful rare earth mangets up to now. Nowadays they have been used in many fields for defferent applications.The production technology of NdFeB magnets has developed fast to a high level. In many fields, they have replaced tranditional magnets such as ferrite magnet,alnico magnets and smco magnets.

There are two kinds of Neodymium magnets,Sintered NdFeB and Bonded NdFeB. We mainly produced sintered NdFeB because it is the one widely used in many fields.

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Clink here for more information of Sintered NdFeB Magnets and Bonded NdFeB Magnets.

Sintered Neodymium Magnets(Sintered NdFeB )

Bonded Neodymium Magnets(Bonded NdFeB)



Sintered Neodymium Rare Earth Magnets for sale

Sintered Neodymium Permanent Magnet Overview

Sintered neodymium magnets for sale is the most powerful permanent magnet in the contemporary. The coercive force of Sintered NdFeB is very high and its Bhmax is about ten times of that of Ferrite magnet. It can support about 640 times of its weight. As its fairly good mechanical properties, it can be processed into many different shapes or with various holes. Some of its products with high-perfomance can work under the situation up to 200℃. However, it is easy to be rusted for its elements.Therefore we should make surface treatment in terms with different requirements, such as zinc-coated,Nickel-coated,Ag-coated,Au-coated,Epoxy-coated etc.
At present we can manufacture the sintered NdFeB in a range of physical grades like following table. And we can realize different shapes such as disc magnets, ring magnes,rectangle magnets, arc segment magnets and some other special shaped magnets.

Physical properties of Sintered NdFeB Magnets.

Type/Grade	Residual induction Br(KGs)	Coercive Force bHc(KOe)	Intrinsic coercive Force iHc(KOe)	Squareness (Hk/iHe)	Max. Energy Product (BH)max.(MGOe)	Max. Operating Temp.(°C)	Inquiry
N27	10.3-10.8	≥ 10.0	≥12	≥0.85	25-29	80
N30	10.8-11.3	≥ 10.0	≥12	≥0.85	28-31	80
N33	11.3-11.7	≥ 10.5	≥12	≥0.85	31-34	80
N35	11.7-12.3	10.7-12.0	≥12	≥0.85	33-36	80
N38	12.1-12.7	11.1-12.4	≥12	≥0.85	36-39	80
N40	12.5-13.2	11.5-12.8	≥12	≥0.85	38-41	80
N42	12.9-13.5	11.5-13.2	≥12	≥0.85	40-43	80
N45	13.3-13.9	11.5-13.6	≥11	≥0.85	43-46	80
N48	13.7-14.3	11.5-14.0	≥11	≥0.85	46-49	80
N50	14.1-14.9	11.5-14.0	≥11	≥0.85	49-51	80
33M	11.3-11.9	10.3-11.6	≥14	≥0.85	31-33	100
35M	11.7-12.3	10.7-12.0	≥14	≥0.85	33-36	100
38M	12.1-12.7	11.1-12.4	≥14	≥0.85	36-39	100
40M	12.5-13.2	11.5-12.8	≥14	≥0.85	38-41	100
42M	12.9-13.5	11.9-13.2	≥14	≥0.85	40-43	100
45M	13.3-13.9	12.3-13.6	≥14	≥0.85	43-46	100
48M	13.7-14.3	12.8-14.1	≥14	≥0.85	46-49	100
30H	10.9-11.5	9.9-11.2	≥17	≥0.85	28-31	120
33H	11.3-11.9	10.3-11.6	≥17	≥0.85	31-34	120
35H	11.7-12.3	10.7-12.0	≥17	≥0.85	33-36	120	Inquiry
38H	12.1-12.7	11.1-12.4	≥17	≥0.85	36-39	120
40H	12.5-13.2	11.5-12.8	≥17	≥0.85	38-41	120
42H	12.9-13.5	11.9-13.2	≥17	≥0.85	40-43	120
45H	13.3-13.9	12.5-13.8	≥17	≥0.85	43-46	120
27SH	10.5-11.1	9.5-10.8	≥20	≥0.85	25-28	150
30SH	10.9-11.5	9.9-11.2	≥20	≥0.85	28-31	150
33SH	11.3-11.9	10.3-11.6	≥20	≥0.85	31-34	150
35SH	11.7-12.3	10.7-12.0	≥20	≥0.85	33-36	150
38SH	12.1-12.7	11.1-12.4	≥20	≥0.85	36-39	150
40SH	12.5-13.2	11.5-12.8	≥20	≥0.85	38-41	150
42SH	12.9-13.5	11.9-13.2	≥20	≥0.85	40-43	150
25UH	10.1-10.7	9.1-10.4	≥25	≥0.85	23-26	180
27UH	10.5-11.1	9.5-10.8	≥25	≥0.85	25-28	180
30UH	10.9-11.5	9.9-11.2	≥25	≥0.85	28-31	180
33UH	11.3-11.9	10.3-11.6	≥25	≥0.85	31-34	180
35UH	11.7-12.3	10.7-12.0	≥25	≥0.85	33-36	180
38UH	12.1-12.9	11.1-12.6	≥25	≥0.85	36-39	180
40UH	12.5-13.3	11.5-13.0	≥25	≥0.85	38-41	180
23EH	9.7-10.3	8.7-10.0	≥30	≥0.85	21-24	200
25EH	10.1-10.7	9.1-10.4	≥30	≥0.85	23-26	200
27EH	10.5-11.1	9.5-10.8	≥30	≥0.85	25-28	200
30EH	10.9-11.5	9.9-11.2	≥30	≥0.85	28-31	200
33EH	11.3-11.9	10.3-11.6	≥30	≥0.85	31-34	200
35EH	11.7-12.3	10.7-12.0	≥30	≥0.85	33-36	200
38EH	12.1-12.9	11.1-12.6	≥30	≥0.85	36-39	200



Surface Treatment

The corrosion resistance  of NdFeB is considered poor. Painting, coating, or plating is therefore highly recommended for neodymium magnets for sale. Plating NdFeB is a difficult process, and commercial plating plants are unlikely to be able to achieve plating with good adhesion. Nickel, Zinc, or Tin plating provides good corrosion resistance for NdFeB magnets. We are also able to make cadmium chromate or aluminum chromate as NdFeB coating by using vacuum deposition techniques. A variety of organic coatings have also been successfully developed for NdFeB, exhibiting good corrosion resistance characteristics. Especially in harsh environments, it may be advisable to use a combination of coating techniques, or to encapsulate the material in a sealed housing. 

The coating of sintered NdFeB magnet and its corrosion resistance:
Coating	Zn		Ni	Ni-Cu-Ni + Epoxy	Electro- phoresis	NiCuNi+(Sn or Au or Ag,Cr)	Chromate
	White	Colour	Double layers
Corrosion resistance	Good	Excellent	Excellent	Excellent	Very good	Very good	good

Magnetizing and Handling

All neodymium magnets for sale 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. We will recommand right magnetic direction for you in accord with your requirements.
Rare Earth materials are mechanically weak, and magnetically very strong. They must therefore be handled very carefully to avoid damage and injury during personnel handling the magnets. Receiving and assembly personnel should be warned about the of handling magnetized Rare Earth magnets.

Dimension Range of Sintered NdFeB:
	Length (OD) mm		Width (ID) mm		ThickF1.ss mm
	Min.	Max.	Min.	Max.	Min.	Max.
Block	1	150	1	100	0.5	150
Ring	1	150	1	140	0.6	50
Disc/Bar	1	150			0.6	50
	Length		Chord Length
	Min.	Max	Min.	Max.
Segment	3	50	5	150

If you need magnets with any special shape and dimensions , please feel free to contact us and we will try to help you.

Eguiped automatic machining eguipments,We will supply customers all shapes of magnets according to customer’s reguirement.

Bonded Neodymium Magnets for sale

Bonded Neodymium Permanent Magnet Overview

Bonded Neodymium magnets are manufactured by binding rapid-quenching NdFeB powder. The powder is mixed with resin to form a magnet by compression molding or injection molding. The bonded NdFeB Magnets material can be produced with close tolerances of tool, with little or no finishing required. The energy product of the bonded form is much lower than that of the sintered form - up to 10 MGOe. The bonded NdFeB is isotropic and can be magnetized in any direction, and with multiple poles.

Compression Molding Bonded NdFeB

Compression - this is a technique whereby a special form of NdFeB powder is blended with a plastic carrier material, die pressed and then heated. Parts made in this way can be of complex shapes and come off the tool with close tolerances, requiring no further finish machining.

Injection Molding Bonded NdFeB

Injection - NdFeB powder is blended with a plastic material and injection molded. The resulting parts have energy products in the 5 MGOe range, but can be made with extremely intricate shapes. Injection molded magnets are available using ferrite, neodymium-iron-boron, or blends of magnetic materials to achieve an extensive range of properties. The finished parts can be either very simple or complex in geometry. The injection molded magnet has a high mechanical strength and may be molded together with other matching parts.

Pressing adhesive performance parameters table NdFeB

Grade	BNP-6	BNP-8L	BNP-8	BNP-8SR	BNP-8H	BNP-9	BNP-10	BNP-11	BNP-11L	BNP-12L
B r T(Gs)	0.55-0.62	0.60-0.64	0.62-0.69	0.62-0.66	0.61-0.65	0.65-0.70	0.68-0.72	0.70-0.74	0.70-0.74	0.74-0.80
H CB kA/m(kOe)	285-370 (3.6-4.6)	360-400 (4.5-5.0)	385-445 (4.8-5.6)	410-465 (5.2-5.8)	410-455 (5.2-5.7)	400-440 (5.0-5.5)	420-470 (5.3-5.9)	445-480 (5.6-6.0)	400-440 (5.0-5.5)	420-455 (5.3-5.7)
H CJ kA/m(kOe)	600-755 (7.5-9.5)	715-800 (9-10)	640-800 (8-10)	880-1120 (11-14)	1190-1440 (15-18)	640-800 (8-10)	640-800 (8-10)	680-800 (8.5-10)	520-640 (6.5-8)	520-600 (6.5-7.5)
(BH) max kJ/m 3 (MGOe)	44-56 （ 5.5-7 ）	56-64 （ 7.0-8.0 ）	64-72 （ 8.0-9.0 ）	64-72 （ 8.0-9.0 ）	64-72 （ 8.0-9.0 ）	70-76 （ 8.8-9.5 ）	76-84 （ 9.5-10.5 ）	80-88 （ 10.0-11.0 ）	78-84 （ 9.8-10.5 ）	84-92 （ 10.5-11.5 ）
D g/cm 3	5.5-6.1	5.6-6.1	5.8-6.1	5.8-6.1	5.9-6.2	5.8-6.1	5.8-6.1	5.8-6.1	5.8-6.1	5.8-6.1
μ r	1.15	1.15	1.15	1.13	1.15	1.22	1.22	1.22	1.26	1.26
α（ B r ） %/ ℃	-0.13	-0.13	-0.13	-0.13	-0.07	-0.12	-0.11	-0.11	-0.11	-0.08
T w ℃	100	110	120	150	125	120	120	120	110	110

Injection Molding NdFeB magnetic properties and physical characteristics

Grade	BNI-3	BNI-4	BNI-5	BNI-6	BNI-6H	BNI-7	BNI-5SR (PPS)
B r T (Gs)	0.2-0.4	0.40-0.46	0.45-0.51	0.51-0.56	0.48-0.56	0.54-0.64	0.45-0.50
H CB kA/m(kOe)	120-240 (1.5-3.0)	250-335 (3.1-4.2)	280-360 (3.5-4.5)	295-375 (3.7-4.7)	335-400 (4.2-5.0)	320-400 (4.0-5.0)	300-360 (3.8-4.5)
H CJ kA/m(kOe)	480-640 (6.0-8.0)	575-735 (7.2-9.2)	640-800 (8-10)	640-800 (8-10)	1035-1355 (13-17)	640-800 (8-10)	875-1115 (11-14)
(BH)max kJ/m 3 (MGOe)	8-24 (1.0-3.0)	28-36 (3.5-4.5)	37-44 (4.6-5.5)	44-52 (5.5-6.5)	40-52 (5.0-6.5)	51-59 (6.5-7.5)	36-44 (4.5-5.5)
D g/cm 3	3.9-4.4	4.2-4.9	4.5-5.0	4.7-5.1	4.8-5.2	5.0-5.5	4.9-5.4
μ r	1.2	1.2	1.2	1.13	1.13	1.13	1.13
α（ B r ） %/ ℃	-0.15	-0.13	-0.13	-0.11	-0.15	-0.11	-0.13
T w ℃	100	110	120	120	130	120	150



Surface Treatment

Epoxy coating is mostly common used for bonded NdFeB magnets.

Neodymium Magnets for sale Machining

Bonded NdFeB is easily machined. Coolants must be used while machining this material in order to avoid spontaneous combustion of powder. Machining this material removes a layer of protective coating, and re-coating for corrosion resistance may be necessary.

Magnetizing and Handling

Isotropic bonded NdFeB materials can be magnetized in any direction, or with multiple poles. Special magnetizing fixtures are required in order to achieve multiple pole magnetization. Such multiple pole fixtures may cost several thousand dollars depending on complexity of design and production rate requirements. We will recommand right magnetic direction for you in accord with your requirements.neodymium magnets for sale

Temperature Effects

Magnetic properties of NdFeB deteriorate rapidly above about 130 Centigrade, 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 210 Centigrade. Shapes, Sizes, and Grades Available Isotropic bonded NdFeB can be specially formulated to meet special requirements, with energy products from 1 to 10MGOe, as required.

 

Dimension range of Plastic Bonded NdFeB
	Length mm (Outer Diameter)		Width mm (Inner Diameter)		Thickness mm
	Min.	Max.	Min.	Max.	Min.	Max.
Block	5.0	100	5.0	100	0.8	50
Ring	5	100	3	95	0.8	50

The above table is only for reference. Any questions, please feel free to contact us.

 

 

 

 

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