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NdFeB Sintered Magnet

NDFEB

Known as the third Generation of Rare Earth Magnets, Neodymium-Iron-Boron(NdFeB) magnets are the most powerful and advanced commercialized permanent magnets today. NdFeB magnets are introduced in 1980. This material offers the highest Energy Product (BH)max commercially available. Today their typical applications include high performance sensors, various DC motors, linear actuators, MRI, wind energy turbines etc. The highest (BH)max reaches up to 51MGOe. The choice of strip casting and HDDR technology in our factory allow us to make high performance NdFeB over N52 possible. The intrinsic coercive force is over 30000 Oe. Also, magnets are protected with effective surface treatment to prevent corrosion.

MAGNETIC CHARACTERISTICS AND PHYSICAL PROPERTIES OF SINTERED Nd-Fe-B

PROPERTIES
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GRADE

BrmT (KGs) Hcb KA/m (Koe) Hcj KA/m (KOe) (BH)max KJ/m³ (MGOe) TW 
N33 1130-1170 (11.3-11.7) 836 (10.5) 955 (12) 247-263 (31-33) 80
N35 1170-1210 (11.7-12.1) 868 (10.9) 955 (12) 263-287 (33-36) 80
N38 1210-1250 (12.1-12.5) 899 (11.3) 955 (12) 287-310 (36-39) 80
N40 1250-1280 (12.5-12.8) 923 (11.6) 955 (12) 302-326 (38-41) 80
N42 1280-1320 (12.8-13.2) 923 (11.6) 955 (12)  318-342 (40-43) 80
N45 1320-1380 (13.2-13.8) 876 (11.0) 955 (12) 342-366 (43-46) 80
N48 1380-1420 (13.8-14.2) 835 (10.5) 876 (11) 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
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 (14) 366-390 (46-49) 100
N50M 1400-1450 (14.0-14.5) 1033 (13.0) 1114 (14) 382-406 (48-51) 100
33H 1130-1170 (11.3-11.7) 836 (10.5) 1353 (17) 247-271 (31-34) 120
35H 1170-1210 (11.7-12.1) 868 (10.9) 1353 (17) 263-287 (33-36) 120
38H 1210-1250 (12.1-12.5) 899 (11.3) 1353 (17) 287-310 (36-39) 120
40H 1240-1280 (12.4-12.8) 923 (11.6) 1353 (17) 302-326 (38-41) 120
42H 1280-1320 (12.8-13.2) 955 (12.0) 1353 (17) 318-342 (40-43) 120
45H 1300-1360 (13.0-13.6) 963 (12.1) 1353 (17) 342-358 (43-46) 120
48H 1370-1430 (13.7-14.3) 995 (12.5) 1353 (17) 358-390 (46-49) 120
33SH 1130-1170 (11.3-11.7) 844 (10.6) 1592 (20) 247-272 (31-34) 150
35SH 1170-1210 (11.7-12.1) 876 (11.0) 1592 (20) 263-287 (33-36) 150
38SH 1210-1250 (12.1-12.5) 907 (11.4) 1592 (20) 287-310 (36-39) 150
40SH 1240-1280 (12.4-12.8) 939 (11.8) 1592 (20) 302-326 (38-41) 150
42SH 1280-1320 (12.8-13.2) 987 (12.4) 1592 (20) 318-342 (40-43) 150
45SH 1320-1380 (13.2-13.8) 1003 (12.6) 1592 (20) 342-366 (43-46) 150
28UH 1020-1080 (10.2-10.8) 764 (9.6) 1990 (25) 207-231 (26-29) 180
30UH 1080-1130 (10.8-11.3) 812 (10.2) 1990 (25) 223-247 (28-31) 180
33UH 1130-1170 (11.3-11.7) 852 (10.7) 1990 (25) 247-271 (31-34) 180
35UH 1180-1220 (11.8-12.2) 860 (10.8) 1990 (25) 263-287 (33-36) 180
38UH 1220-1250 (12.2-12.5) 876 (11.0) 1990 (25) 287-310 (36-39) 180
40UH 1240-1280 (12.4-12.8) 899 (11.3) 1990 (25) 302-326 (38-41) 180
28EH 1040-1090 (10.4-10.9) 780 (9.8) 2388 (30) 207-231 (26-29) 200
30EH 1080-1130 (10.8-11.3) 812 (10.2)

2388 (30)

223-247 (28-31) 200
33EH 1130-1170 (11.3-11.7) 836 (10.5) 2388 (30) 247-271 (31-34) 200
35EH 1170-1220 (11.7-12.2) 876 (11.0) 2388 (30) 263-287 (33-36) 200
38EH 1220-1250 (12.2-12.5) 899 (11.3) 2388 (30) 287-310 (36-39)

200

Coating and Corrosive Resistance of Sintered NdFeB
Surface Coating Colour Thickness(μm) Standard Resistance Corrosive Resistance
PCT Test Salt Spray Test
Nickel Nickel Silver 10-20 48hr or 72hr 72hr EXCELLENT
Ni+Cu+Ni
Zinc Blue Zinc Bright Blue 8-20 24hr 24hr GOOD
Colour Zinc Shinny Colour
Epoxy Epoxy Black / Grey 15-25 48hr 96hr EXCELLENT
Ni+Cu+Epoxy
Tin Ni+Cu+Sn Silver 15-20 72hr 72hr SUPERIOR
Parylene Parylene Grey 15-25 96hr 200hr SUPERIOR
Teflon Teflon Grey 10-20 12hr 24hr SUPERIOR
Phosphorization / Grey 1-2 - - TEMPORARY PROETCTION
Passivation / Grey 1-2 - - TEMPORARY PROETCTION
ItemParametersReference Value
Additional
Magnetic
Properties
Temp.Coeff.of Br (α(Br))/(%/K) -0.08  -0.12
Temp.Coeff.of Hcj (β(Hcj))/(%/K) -0.42  -0.70
Curie Temperature (Tc)/K 310  380
Recoil Permeability (μrec)[-]1.05
Mechanical
and Physical
Properties
Density (g/cm³) 7.6
Vickers Hardness (Hv) 650
Electrical Resistivity (μΩom) 1.4
Compressive Strength (Mpa) 1050
Tensile Strength (Mpa) 80
Bending Strength (Mpa) 290
Thermal Conductivity (W/(moK)) 6  8
Young's Modulus (Gpa) 160
 Coefficient of Thermal Expansive (C) (10-6/K) -1.5
 Coefficient of Thermal Expansive (C) (10-6/K) 6.5

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