NdFeB MAGNETS

NdFeB Magnets Covina CaliforniaNeodymium Iron Boron magnets (NdFeB) are “Rare Earth” magnets that are the most powerful and commercialized permanent magnet used today. NdFeB energy levels range from 26 MGOe to 52 MGOe. With excellent characteristics, grades and a wide range of properties NdFeB magnets achieves higher efficiency offering more flexibility for new designs than the other magnet materials.

NeFdB magnets are produced sintered or in bonded form. They are brittle and require specialized machining (unmagnetized always if possible). Due to its rapid magnetic deterioration and irreversible loss when reaching above 130◦C, selection of the different grades is controlled by environmental and operating temperatures.

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Manufacturing Method: Sintered-Bonded


Sintered- A fine powder is compressed in a die and then sintered to fuse the powder into a solid magnet.  There are two forms of pressing: Hard die pressing which involves a hard die with the fine powder placed and then pressed creating an Anisotropic (oriented) field. The 2nd is a Rubber die with the powder placed and isostatic pressed with equal force on the powder in all directions to create an Isotropic (unoriented) field. Sintered NeFdB magnets typically require some machining for tighter tolerances.

Bonded- A special NdFeB powder is mixed with a carrier made of plastic material is die pressed then heated. Magnets produced with this method can obtain complexed shapes and retain close tolerances. Bonded NdFeB magnets are Isotropic and have low energy close to 10 MGOe.

Machining


Machining NdFeB magnets requires “specialized methods”. Meaning using conventional operations such as: milling, turning, drilling etc. in most cases will not work. Grinders-ID/OD/Centerless/Surface with Diamond wheels and EDM’s-Sinker/Wire are most commonly used. Utilizing these methods will result in precise dimensions and tight tolerances.

Assemblies


Most magnetic assemblies are fabricated by bonding the magnets with adhesives. They also can be fastened mechanically. Either process or combined will reasonably withstand the environmental impacts. Press fits are not recommended due to the brittle conditions of NdFeB magnets.

Common Applications for Neodymium Iron Boron Magnets


NdFeB magnets typically require high strength and hold forces for applications such as: yoke assemblies, steppers, servos, magnetic bearings/couplings, Halbach arrays, magnetic resonance, sputtering, switches, relays,  vacuum disposition, charged particle beam guidance and others.

Neodymium Iron Boron

Magnetic Properties

GradeBr
mT (kGs)
Hcb
kA/m (kOe)
Hcj
kA/m (kOe)
(BH)max
kJ/m3 (MGOe)
Maximum
Operating Temp (Tw ℃ )
N33 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 955 ( ≥ 12) 247-271 (31-34) 80 ℃
N35 1170-1220 (11.7-12.2) ≥ 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 (43-46) 80 ℃
N48 1380-1420 (13.8-14.2) ≥ 923 ( ≥ 11.6) ≥ 876 ( ≥ 12) 366-390 (46-49) 80 ℃
N50 1400-1450 (14.0-14.5) ≥ 796 ( ≥ 10.0) ≥ 876 ( ≥ 11) 382-406 (48-51) 60 ℃
N52 1430-1480 (14.3-14.8) ≥ 796 ( ≥ 10.0) ≥ 876 ( ≥ 11) 398-422 (50-53) 60 ℃
N30M 1080-1130 (10.8-11.3) ≥ 796 ( ≥ 10.0) ≥ 1114 ( ≥ 14) 223-247 (28-31) 100 ℃
N33M 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 1114 ( ≥ 14) 247-263 (31-33) 100 ℃
N35M 1170-1220 (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) ≥ 955 ( ≥ 12.0) ≥ 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 1( ≥ 14) 366-390 (46-49) 100 ℃
N50M 1400-1450 (14.0-14.5) ≥ 1033 ( ≥ 13.0) ≥ 1114 ( ≥ 14) 382-406 (48-51) 100 ℃
N30H 1080-1130 (10.8-11.3) ≥ 796 ( ≥ 10.0) ≥ 1353 ( ≥ 17) 223-247 (28-31) 120 ℃
N33H 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 1353 ( ≥ 17) 247-271 (31-34) 120 ℃
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 ( ≥ 12.0) ≥ 1353 ( ≥ 17) 318-342 (40-43) 120 ℃
N45H1300-1360 (13-13.6) ≥ 963 ( ≥ 12.1) ≥ 1353 ( ≥ 17) 326-358 (43-46) 120 ℃
N48H 1370-1430 (13.7-14.3) ≥ 995 ( ≥ 12.5) ≥ 1353 ( ≥ 17) 366-390 (46-49) 120 ℃
N30SH 1080-1130 (10.8-11.3) ≥ 804 ( ≥ 10.1) ≥ 1592 ( ≥ 20) 223-247 (28-31) 150 ℃
N33SH 1130-1170 (11.3-11.7) ≥ 844( ≥ 10.6) ≥ 1592 ( ≥ 20) 247-271 (31-34) 150 ℃
N35SH 1170-1220 (11.7-12.2) ≥ 876 ( ≥ 11.0) ≥ 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 ℃
N42SH 1280-1320 (12.8-13.2) ≥ 987 ( ≥ 12.4) ≥ 1592 ( ≥ 20) 318-342 (40-43) 150 ℃
N45SH 1320-1380 (13.2-13.8) ≥ 1003 ( ≥ 12.6) ≥ 1592 ( ≥ 20) 342-366 (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) ≥ 836 ( ≥ 10.5) ≥ 2388 ( ≥ 30) 247-271 (31-34) 200 ℃
N35EH1170-1220 (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 ℃

Neodymium Iron Boron

Physical Properties

DensityBending StrengthCompressive StrengthElectrical
Resistivity (Ωm)
Coefficient of Thermal Expansion1CurieTemperature
(kg/m3)(lbs/in3)(kg/m2)(lbs/in2)(kg/m2)(lbs/in2)// M”´M(°C)(°F)
7.6 x 1030.2752.95 x 1034.2 x 1049.6 x 1031.3 x 1051.4 x 1087.9 x 10-5-1.7 x 10-5345655

// M Parallel to magnetic orientation
”´M Perpendicular to magnetic orientation

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