NdFeb (Neodymium Iron Boron) Info

Sintered neodymium iron boron (NdFeB) magnets are the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 24 MGOe to 55 MGOe. It has a combination of very high remanence and coercivity, and comes with a wide range of grades, sizes and shapes. With its excellent magnetic characteristics, abundant raw material and relatively low prices, NdFeB offers more flexibility in designing of new magnets or replacing the traditional magnetic materials such as ceramic, Alnico and SmCo to achieve high efficiency, low cost and more compact devices.


Cylinder with
Side Hole
Open Side Thin
Wall Cylinder
NdFeB Cylinder
with+/-.0002 ID
Skewed Arc
NdFeB Magnet
.012" Dia x1.25"
Slender NdFeB Rod

A powder metallurgy process is used in producing sintered NdFeB magnets. Although sintered NdFeB is mechanically stronger than SmCo magnets and less brittle than other magnets, it should not be used as structural component. Selection of NdFeB is limited by temperature due to its irreversible loss and moderately high reversible temperature coefficient of B r and H ci. The maximum application temperature is 200 °C for high coercivity grades. Its actual performance at that temperature is governed strongly by the design

Of the magnetic circuit. NdFeB magnets are more prone to oxidation than any other magnet alloys. If NdFeB magnet is to be exposed to humidity, chemically aggressive media such as acids, alkaline solutions, salts and harmful gases, coating is recommended. It is not recommended in a hydrogen atmosphere.

NdFeB and SmCo are collectively known as Rare Earth magnets because they are both composed of materials from the Rare Earth group of elements. Neodymium Iron Boron (general composition Nd 2Fe 14B, often abbreviated to NdFeB) is the most recent commercial addition to the family of modern magnet materials. At room temperatures, NdFeB magnets exhibit the highest magnetic properties of all magnet materials.

 
Spec of NdFeB
MAGNETIC CHARACTERISTICS AND PHYSICAL PROPERTIES OF SINTERED NEODYMIUM IRON BORON
Type of Magnet Remanence Intrinsic Coercivity Coercivity Maximum Energy Product Maximum
Working
Temperature
Reference Br mT Hci KA/m Hc KA/m (BH)max KJ/m3 Tw
Designation (KG) (KOe) (KOe) (MGOe) C°
N33/12 1130-1170 ≥955 ≥836 247-263 80
(11.3-11.7) (≥12) (≥10.5) (31-33)
N35/12 1170-1210 ≥955 ≥868 263-287 80
(11.7-12.1) (≥12) (≥10.9) (33-36)
N38/12 1210-1250 ≥955 ≥899 287-310 80
(12.1-12.5) (≥12) (≥11.3) (36-39)
N40/12 1250-1280 ≥955 ≥923 318-342 80
(12.5-12.8) (≥12) (≥11.6) (38-41)
N42/12 1280-1320 ≥955 ≥923 318-342 80
(12.8-13.2) (≥12) (≥11.6) (40-43)
N45/12 1320-1380 ≥955 ≥876 342-366 80
(13.2-13.8) (≥12) (≥11.0) (43-46)
N48/12 1380-1420 ≥876 ≥835 366-390 80
(13.8-14.2) (≥11) (≥10.5) (46-49)
N50/12 1400-1450 ≥955 ≥860 382-406 80
(14.0-14.0) (≥12.0) (≥10.8) (48-51)
N52/11 1420-1470 ≥875 ≥820 382-422 80
(14.2-14.7) (≥11.0) (≥10.3) (48-53)
N55/13 1470-1520 ≥1034 ≥994 413-446 100
(14.7-15.2) (≥12.5) (≥12.0) (52-56)
N33/14  (M) 1130-1170 ≥1114 ≥836 247-263 100
(11.3-11.7) (≥14) (≥10.5) (31-33)
N35/14  (M) 1170-1210 ≥1114 ≥868 263-287 100
(11.7-12.1) (≥14) (≥10.9) (33-36)
N38/14  (M) 1210-1250 ≥1114 ≥899 287-310 100
(12.1-12.5) (≥14) (≥11.3) (36-39)
N40/14  (M) 1250-1280 ≥1114 ≥923 318-342 100
(12.5-12.8) (≥14) (≥11.6) (38-41)
N42/14  (M) 1280-1320 ≥1114 ≥955 318-342 100
(12.8-13.2) (≥14) (≥12.0) (40-43)
N45/14  (M) 1320-1380 ≥1114 ≥955 342-366 100
(13.2-13.8) (≥14) (≥12.0) (43-46)
N48/14  (M) 1360-1430 ≥1114 ≥1027 350-390 100
(13.6-14.3) (≥14) (≥12.9) (44-49)
N33/17  (H) 1130-1170 ≥1353 ≥836 247-271 120
(11.3-11.7) (≥17.0) (≥10.5) (31-34)
N35/17  (H) 1170-1210 ≥1353 ≥868 287-310 120
(11.7-12.1) (≥17.0) (≥10.9) (33-36)
N38/17  (H) 1210-1250 ≥1353 ≥899 263-288 120
(12.1-12.5) (≥17.0) (≥11.3) (33-36)
N40/17  (H) 1240-1280 ≥1353 ≥923 302-326 120
(12.4-12.8) (≥17) (≥11.6) (38-41)
N42/17  (H) 1280-1320 ≥1353 ≥955 318-342 120
(12.8-13.2) (≥17) (≥12.0) (40-43)
N45/17  (H) 1320-1360 ≥1353 ≥1000 344-376 120
(13.2-13.6) (≥17) (≥12.5) (42-47)
N33/20  (SH) 1130-1170 ≥1592 ≥844 247-272 150
(11.3-11.7) (≥20) (≥10.6) (31-34)
N35/20  (SH) 1170-1210 ≥1582 ≥876 263-287 150
(11.7-12.1) (≥20) (≥11.0) (33-36)
N38/20  (SH) 1210-1250 ≥1592 ≥907 287-310 150
(12.1-12.5) (≥20) (≥11.4) (36-39)
N40/20  (SH) 1240-1280 ≥1592 ≥939 302-326 150
(12.4-12.8) (≥20) (≥11.8) (38-41)
N28/25  (UH) 1020-1080 ≥1990 ≥764 207-231 180
(10.2-10.8) (≥25) (≥9.6) (26-29)
N30/25  (UH) 1080-1130 ≥1990 ≥812 223-247 180
(10.8-11.3) (≥25) (≥10.2) (28-31)
N33/25  (UH) 1130-1170 ≥1990 ≥852 247-271 180
(11.3-11.7) (≥25) (≥10.7) (31-34)
N28/30  (EH) 1040-1090 ≥2388 ≥780 207-231 200
(10.4-10.9) (≥30) (≥9.8) (26-29)
N30/30  (EH) 1080-1130 ≥2388 ≥812 223-247 200
(10.8-11.3) (≥30) (≥10.2) (28-31)
Remarks:
  • The above-mentioned data of magnetic parameters and physical properties are given at room temperature.
  • The maximum service temperature of magnet is changeable due to the ratio length and diameter and enviromental factors.
  • If the material you are looking for is not listed, please contact technical sales to discuss about your needs. 
 
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