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.    .

NdFeB Magnets and Bonded NdFeB Magnets.

 



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.

Magnetic properties of Sintered NdFeB magnets: Grade Remanence Coercive Force Intrinsic Coercive Force Max. energy product Max. Operating Temperature Br Hcb Hcj (BH ) Tw max   mT kA/m kA/m kJ/m3 (kGs) (kOe) (kOe) (MGOe) N35 1170-1220 >= 868 >=955 263-287 80C (11.7-12.2) ( >= 10.9) ( >= 12) (33-36) N38 1220-1250 >=899 >=955 287-310 80C (12.2-12.5) ( >= 11.3) ( >= 12) (36-39) N40 1250-1280 >= 907 >=955 302-326 80C (12.5-12.8) ( >= 11.4) ( >= 12) (38-41) N42 1280-1320 >= 915 >=955 318-342 80C (12.8-13.2) ( >= 11.5) ( >= 12) (40-43) N45 1320-1380 >= 923 >=955 342-366 80C (13.2-13.8) ( >= 11.6) ( >= 12) (43-46) N48 1380-1420 >= 923 >=955 366-390 80C (13.8-14.2) ( >=11.6) ( >= 12) (46-49) N50 1400-1450 >= 796 >=955 382-406 80C (14.0-14.5) ( >= 10.0) ( >= 12) (48-51) N52 1430-1480 >= 796 >=955 398-422 80C (14.3-14.8) ( >= 10.0) ( >= 12) (50-53) 33M 1130-1170 >= 836 >= 1114 247-263 100C (11.3-11.7)   (>= 10.5) ( >= 14) (31-33) 35M 1170-1220 >= 868 >= 1114 263-287 100C (11.7-12.2) ( >= 10.9) ( >= 14)   (33-36) 38M 1220-1250 >= 899 >= 1114 287-310 100C (12.2-12.5) ( >= 11.3) ( >= 14) (36-39) 40M 1250-1280 >= 923 >= 1114 302-326 100C (12.5-12.8) ( >= 11.6) ( >= 14) (38-41) 42M 1280-1320 >= 955   >= 1114   318-342   100C (12.8-13.2) ( >= 12.0) ( >= 14) (40-43) 45M 1320-1380 >= 995 >= 1114 342-366 100C (13.2-13.8) ( >= 12.5) ( >= 14) (43-46) 48M 1360-1430 >= 1027 >= 1114 366-390 100C (13.6-14.3) ( >= 12.9) ( >= 14) (46-49) 50M 1400-1450 >= 1033 >= 1114 382-406 100C (14.0-14.5) ( >= 13.0) ( >= 14) (48-51) 35H 1170-1220 >= 868 >= 1353 263-287 120C (11.7-12.2) ( >= 10.9) ( >= 17) (33-36) 38H 1220-1250 >= 899 >= 1353 287-310 120C (12.2-12.5) ( >= 11.3) ( >= 17) (36-39) 40H 1250-1280 >= 923 >= 1353 302-326 120C (12.5-12.8) ( >= 11.6) ( >= 17) (38-41) 42H 1280-1320 >= 955 >= 1353 318-342 120C (12.8-13.2) ( >= 12.0) ( >= 17) (40-43) 45H 1320-1360 >= 963 >= 1353 326-358 120C (13.2-13.6) ( >= 12.1) ( >= 17) (43-46) 48H 1370-1430 >= 995 >= 1353 366-390 120C (13.7-14.3) ( >= 12.5) ( >= 17) (46-49) 35SH 1170-1220 >= 876 >= 1592 263-287 150C (11.7-12.2) ( >= 11.0) ( >= 20) (33-36) 38SH 1220-1250 >= 907 >= 1592 287-310 150C (12.2-12.5) ( >= 11.4) ( >= 20) (36-39) 40SH 1240-1280 >= 939 >= 1592 302-326 150C (12.5-12.8) ( >= 11.8) ( >= 20) (38-41) 42SH 1280-1320 >= 987 >= 1592 318-342 150C (12.8-13.2) ( >= 12.4) ( >= 20) (40-43) 45SH 1320-1380 >= 1003 >= 1592 342-366 150C (13.2-13.8) ( >= 12.6) ( >= 20) (43-46) 28UH 1020-1080 >= 764 >= 1990 207-231 180C (10.2-10.8) ( >= 9.6) ( >= 25) (26-29) 30UH 1080-1130 >= 812 >= 1990 223-247 180C (10.8-11.3) ( >= 10.2) ( >= 25) (28-31) 33UH 1130-1170 >= 852 >= 1990 247-271 180C (11.3-11.7) ( >= 10.7) ( >= 25) (31-34) 35UH 1180-1220 >= 860 >= 1990 263-287 180C (11.8-12.2) ( >= 10.8) ( >= 25) (33-36) 38UH 1220-1250 >= 876 >= 1990 287-310 180C (12.2-12.5) ( >= 11.0) ( >= 25) (36-39) 40UH 1240-1280 >= 899 >= 1990 302-326 180C (12.5-12.8) ( >=11.3) ( >= 25) (38-41) 28EH 1040-1090 >= 780 >= 2388 207-231 200C (10.4-10.9) ( >= 9.8) ( >= 30) (26-29) 30EH 1080-1130 >= 812 >= 2388 223-247 200C (10.8-11.3) ( >= 10.2) ( >= 30) (28-31) 33EH 1130-1170 >= 876 >= 2388 247-271 200C (11.3-11.7) ( >= 10.5) ( >= 30) (31-34) 35EH 1170-1220 >= 876 >= 2388 263-287 200C (11.7-12.2) ( >= 11.0) ( >= 30) (33-36) 38EH 1220-1250 >= 899 >= 2388 287-310 200C (12.2-12.5) ( >= 11.3) ( >= 30) (36-39) 28AH 1040-1090 >=787 >= 2624 207-231 230C (10.4-10.9) ( >= 9.9) ( >= 33) (26-29) 30AH (26-29) >=819 >= 2624 223-247 230C (10.8-11.3) ( >= 10.3) ( >= 33) (28-31) 33AH 1130-1170 >= 843 >= 2624 247-271 230C (11.3-11.7) (>= 10.6) ( >= 33) (31-34)  Note: The above-mentioned data of magnetic parameters and physical properties are given at room temperature. The maximum working temperature of magnet is changeable due  to ratio of length and diameter and environment factors.

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 customers 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
r	1.15	1.15	1.15	1.13	1.15	1.22	1.22	1.22	1.26	1.26
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
r	1.2	1.2	1.2	1.13	1.13	1.13	1.13
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.

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.