TCM Magnetics sells neodymium magnets. A neodymium magnet (also known as NdFeB, NIB or Neo magnet), the most widely used type of rare-earth magnet, is a permanent magnet made from an alloy of neodymium, iron and boron to form the Nd2Fe14B tetragonal crystalline structure. neodymium magnets are the strongest type of permanent magnet commercially available. They have replaced other types of magnet in the many applications in modern products that require strong permanent magnets, such as motors in cordless tools, hard disk drives and magnetic fasteners.

neodymium magnets

Description

The tetragonal Nd2Fe14B crystal structure has exceptionally high uniaxial magnetocrystalline anisotropy (HA~7 teslas – magnetic field strength H in A/m versus magnetic moment in A.m2). This gives the compound the potential to have high coercivity (i.e., resistance to being demagnetized). The compound also has a high saturation magnetization (Js ~1.6 T or 16 kG) and typically 1.3 teslas. Therefore, as the maximum energy density is proportional to Js2, this magnetic phase has the potential for storing large amounts of magnetic energy (BHmax ~ 512 kJ/m3 or 64 MG·Oe). This property is considerably higher in NdFeB alloys than in samarium cobalt (SmCo) magnets, which were the first type of rare-earth magnet to be commercialized. In practice, the magnetic properties of neodymium magnets depend on the alloy composition, microstructure, and manufacturing technique employed.

Production

The traditional forming method starts with large blocks of material to be cut into smaller blocks. In our proprietary process, the alloy material is first formed into a shape similar to the final product—thus reducing waste and cost. These savings we pass onto you, the customer.

Properties

Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 degrees Celsius) to EH (200 degrees Celsius).

Grades of Neodymium magnets:

► N35-N52    176°F / 80°C
► 33M-48M    212°F / 100°C
► 30H-45H    248°F / 120°C
► 30SH-42SH    302°F / 150°C
► 30UH-42UH    356°F / 180°C
► 28EH-42EH    392°F / 200°C

Grade Remanence (BR)
mT
(KGS)
Coercive Force (Hcb)
kA/m
(kOe)
Intrinisc Coercive Force (Hcj)
kA/m
(kOe)
Max. Energy Product (BH)max Max. Operating Temp
TW
N35 1170-1220
(11.7- 2.2)
868
(10.9)
955
12
263-287
(33-36)
80
N38 1220-1250
(12.2-12.5)
899
(11.3)
955
(12)
287-310
(36-39)
80
N40 1250-1280
(12.5-12.8)
907
(11.4)
955
(12)
302-326
(38-41)
80
N42 1280-1320
(12.8-13.2)
915
(11.5)
955
(12)
318-342
(40-43)
80
N45 1320-1380
(13.2-13.8)
923
(11.6)
955
(12)
342-366
(434-46)
80
N48 1380-1420
(13.8-14.2)
923
(11.6)
955
(12)
366-390
(46-49)
80
N50 1400-1450
(14-14.5)
796
(10)
876
(11)
382-406
(48-51)
80
N52 1430-1480
(14.3-14.80)
796
(10)
876
(11)
398-422
(50-53)
80

In addition to the above standard grades, there are 32 different high temperature grades of neodymium magnets available with a maximum operating temperature of up to 230 degrees Celsius. To give a neodymium magnet a greater resistance to being demagnetised at higher temperatures, varying levels of rare earth elements are used, typically resulting in a trade off with overall magnetic strength.

Grade Remanence (BR)
mT
(KGS)
Coercive Force (Hcb)
kA/m
(kOe)
Intrinisc Coercive Force (Hcj)
kA/m
(kOe)
Max. Energy Product (BH)max Max. Operating Temp
TW
N33M 1130-1170
(11.3-11.7)
836
(10.5)
1114
(14)
247-263
(31-33)
100
N35M 1170-2220
(11.7-12.2)
868
(10.9)
1114
(14)
263-287
(33-36)
100
N38M 1220-1250
(12.2-12.5)
899
(11.3)
1114
(14)
287-310
(36-39)
100
N40M 1250-1280
(12.5-12.8)
923
(11.6)
1114
(14)
302-326
(38-41)
100
N42M 1280-1320
(12.8-13.2)
995
(12)
1114
(14)
318-342
(40-43)
100
N45M 1320-1380
(13.2-13.8)
995
(12.5)
1114
(14)
342-366
(43-46)
100
N48M 1360-1430
(13.6-14.3)
1027
(12.9)
1114
(14)
366-390
(46-49)
100
N50M 1400-1450
(14.0-14.5)
1033
(13)
1114
(14)
382-406
(48-51)
100
N35H 1170-1220
(11.7-12.2)
868
(10.9)
1353
(17)
263-287
(33-36)
120
N38H 1220-1250
(12.2-12.5)
899
(11.3)
1353
(17)
287-310
(36-39)
120
N40H 1250-1280
(12.5-12.8)
923
(11.6)
1353
(17)
302-326
(38-41)
120
N42H 1280-1320
(12.8-13.2)
955
(12)
1353
(17)
318-342
(40-43)
120
N45H 1320-1360
(13.2-13.6)
963
(12.1)
1353
(17)
342-366
(43-46)
120
N48H 1370-1430
(13.7-14.3)
995
(12.5)
1353
(17)
366-390
(46-49)
120
N35SH 1170-1220
(11.7-12.2)
876
(11)
1592
(20)
263-287
(33-36)
150
N38SH 1220-1250
(12.2-12.5)
907
(11.4)
1592
(20)
287-310
(36-39)
150
N40SH 1240-1280
(12.5-12.8)
939
(11.8)
1592
(20)
302-326
(38-41)
150
N45SH 1320-1380
(13.2-13.8)
1003
(12.6)
1592
(20)
242-366
(43-46)
150
N28UH 1020-1080
(10.2-10.8)
764
(9.6)
1990
(25)
207-231
(26-29)
180
N30UH 1080-1130
(10.8-11.3)
812
(10.2)
1990
(25)
223-247
(28-31)
180
N33UH 1130-1170
(11.3-11.7)
852
(10.7)
1990
(25)
247-271
(31-34)
180
N35UH 1180-1220
(11.8-12.2)
860
(10.8)
1990
(25)
263-287
(33-36)
180
N38UH 1220-1250
(12.2-12.5)
876
(11.0)
1990
(25)
287-310
(36-39)
180
N40UH 1240-1280
(12.5-12.8)
899
(11.3)
1990
(25)
302-326
(38-41)
180
N28EH 1040-1090
(10.4-10.9)
780
(9.8)
2388
(30)
207-231
(26-29)
200
N30EH 1080-1130
(10.8-11.3)
812
(10.2)
2388
(30)
223-247
(28-31)
200
N33EH 1130-1170
(11.3-11.7)
876
(10.5)
2388
(30)
247-271
(31-34)
200
N35EH 1170-1220
(11.7-12.2)
876
(11.0)
2388
(30)
263-287
(33-36)
200
N38EH 1220-1250
(12.2-12.5)
899
(11.3)
2388
(30)
287-310
(36-39)
200
N28AH 1040-1090
(10.4-10.9)
787
(9.9)
2624
(33)
207-231
(26-29)
230
N30AH 1080-1130
(10.8-11.3)
819
(10.3)
2624
(33)
223-247
(28-31)
230
N33AH 1130-1170
(11.3-11.7)
843
(10.6)
2624
(33)
247-271
(31-34)
230

Coating necessary

Neodymium reacts to oxygen and oxidises quickly if untreated. That's why all neodymium magnets in our shop are covered with a protective coating, which is so thin that it doesn't have any impact on the adhesive force of the magnet.

PICTURE Coating Features Application
3CrZn 3CrZn Chromate treatment.Hexavalent chromium as environmental damage is limited, replaced by trivalent chromium. ·Electronic components
·tools parts
Ag Ag Good electrical conductivity and low contact resistance, welding performance is good, but easy to fade. ·Electronic components
Au Au Excellent corrosion and oxidation resistance and low resistance. ·Electronic components
·connecting device
·tableware
Cr Cr Excellent abrasion resistance, oxidation resistance, even when it is exposed to the air can also keep good luster. ·exterior parts
·medical supplies
·AV equipment
Cu Cu Easy to change color, are often used in the bottom line, fill uneven area. ·casting products
·ABS resin substrate
Ni Ni Chemical stability, good rust-proof effect. Wide Application, in terms of metal plating, nickel plating is very widespread use. ·Electronic components
·jewelry accessories
NiBlack NiBlack An alloy of nickel and zinc and sulphur.According to the types of foundation of electroplating can change color ·tableware
·jewelry accessories
Sn Sn High corrosion resistance and oxidation resistance.Used in food hygiene is not easy to lose luster and is harmless. ·Tableware
·household utensils
·tableware
·jewelry accessories
no-coating No coating No surface treatment, Neodymium magnets are easy to rust.  
MF305 Epoxy H500-A Impact resistant. Resistance to bending.High temperature can be used. ·Electronic components