rubber magnetNdFeB magnetsmagnetic hematite beadsmagnet

Sintered NdFeB magnets

NdFeB magnets

General Descriptions of sintered NdFeB magnets

sintered NdFeB magnetsThe most powerful magnets available, Sintered NdFeB is produced by powder metallurgical process with chemical composition of Nd2Fe14B, which are hard, brittle and easily corrode, involving the sintering of compacts under vacuum. Poorest corrosion resistance of all commercial magnetic material. Grinding and slicing possible; very reactive with moisture and oxygen; coating may be applied depending on the expected environment. The sintered NdFeB magnet has high remanence, high coercive force, high-energy product and high ratio between performance value and product cost. It may be easily formed into various sizes. The intrinsic coercive force is over 30,000 Oe. Neodymium magnets lose -0.09 ~ -0.13% of Br/C. Their working stability is under 80C for low Hci. NeodSintered NdFeB Magnetsymium magnets and above 200C for high Hci Neodymium magnets. The highest (BH)max reaches up to 51MGOe . The choice of Strip casting and HDDR technology in our factory allows us to make high performance NdFeB over N52 possible. Surface treatments have been developed that allow the sintered NdFeB magnet to be used in most applications. The treatments include gold, nickel, zinc and tin plating and epoxy resin coating.



Magnetic Properties of Sintered NdFeB Magnets

Grade Br Hcb Hcj (BH)max Highest Working Temperature
mT KA/m kA/m k\J/m 3
KGs KOe KOe MGOe L/D ≥ 0.7
N33 1130-1170 ≥ 828 ≥ 955 247-271 80
11.3-11.7 ≥ 10.4 ≥ 12 31-34
N35 1170-1220 ≥ 860 ≥ 955 263-287 80
11.7-12.2 ≥ 10.8 ≥ 12 33-36
N38 1220-1250 ≥ 876 ≥ 955 287-310 80
12.2-12.5 ≥ 11.0 ≥ 12 36-39
N40 1250-1280 ≥ 876 ≥ 955 302-326 80
12.5-12.8 ≥ 11.0 ≥ 12 38-41
N42 1280-1320 ≥ 892 ≥ 955 318-342 80
12.8-13.2 ≥ 11.2 ≥ 12 40-43
N45 1320-1380 ≥ 892 ≥ 955 342-366 80
13.2-13.8 ≥ 11.2 ≥ 12 43-46
N48 1380-1420 ≥ 923 ≥ 876 366-390 80
13.8-14.2 ≥ 11.6 ≥ 12 ?46-49?
N50 1380-1440 ≥ 923 ≥ 955 376-408 80
13.8-14.4 ≥ 11.6 ≥ 12.1 ?47-51
N52 1430-1480 ≥860 ≥876 398-422 80
14.3-14.8 ≥10.8 ≥11 50-53
33M 1130-1170 ≥ 828 ≥ 1114 247-263 100
11.3-11.7 ≥ 10.4 ≥ 14 31-33
35M 1170-1220 ≥ 860 ≥ 1114 263-287 100
11.7-12.2 ≥ 10.8 ≥ 14 33-36
38M 1220-1250 ≥ 860 ≥ 1114 287-310 100
12.2-12.5 ≥ 10.8 ≥ 14 36-39
40M 1250-1280 ≥ 876 ≥ 1114 302-326 100
12.5-12.8 ≥ 11.0 ≥ 14 38-41
42M 1280-1320 ≥ 923 ≥ 1114 318-342 100
12.8-13.2 ≥ 11.6 ≥ 14 40-43
45M 1320-1380 ≥ 955 ≥ 1114 342-366 100
13.2-13.8 ≥ 12.0 ≥ 14 43-46
30H 1080-1120 ≥ 796 ≥ 1353 223-247 120
10.8-11.2 ≥ 10.0 ≥ 17 28-31
33H 1120-1170 ≥ 828 ≥ 1353 247-271 120
11.2-11.7 ≥ 10.4 ≥ 17 31-34
35H 1170-1220 ≥ 860 ≥ 1353 263-287 120
11.7-12.2 ≥ 10.8 ≥ 17 33-36
38H 1220-1250 ≥ 876 ≥ 1353 287-310 120
12.2-12.5 ≥ 11.0 ≥ 17 36-39
40H 1250-1280 ≥ 907 ≥ 1353 302-326 120
12.5-12.8 ≥ 11.4 ≥ 17 38-41
42H 1280-1320 ≥ 939 ≥ 1353 318-342 120
12.8-13.2 ≥ 11.8 ≥ 17 40-43
45H 1300-1360 ≥ 955 ≥ 1353 326-358 120
13-13.6 ≥ 12.0 ≥ 17 43-46
30SH 1080-1120 ≥ 804 ≥ 1592 223-247 150
10.8-11.2 ≥ 10.1 ≥ 20 28-31
33SH 1120-1170 ≥ 828 ≥ 1592 247-271 150
11.2-11.7 ≥ 10.4 ≥ 20 31-34
35SH 1170-1220 ≥ 860 ≥ 1592 263-287 150
11.7-12.2 ≥ 10.8 ≥ 20 33-36
38SH 1220-1250 ≥ 892 ≥ 1592 287-310 150
12.2-12.5 ≥ 11.2 ≥ 20 36-39
40SH 1240-1280 ≥ 923 ≥ 1592 302-326 150
12.5-12.8 ≥ 11.6 ≥ 20 38-41
42SH 1280-1320 ≥ 955 ≥ 1592 318-342 150
12.8-13.2 ≥ 12.0 ≥ 20 40-43
28UH 1020-1080 ≥ 748 ≥ 1990 207-231 180
10.2-10.8 ≥ 9.4 ≥ 25 26-29
30UH 1080-1120 ≥ 812 ≥ 1990 223-247 180
10.8-11.2 ≥ 10.2 ≥ 25 28-31
33UH 1130-1170 ≥ 828 ≥ 1990 247-271 180
11.3-11.7 ≥ 10.4 ≥ 25 31-34
35UH 1180-1220 ≥ 860 ≥ 1990 263-287 180
11.8-12.2 ≥ 10.8 ≥ 25 33-36
28EH 1040-1090 ≥ 780 ≥ 2388 207-231 200
10.4-10.8 ≥ 9.8 ≥ 30 26-29
30EH 1080-1120 ≥ 812 ≥ 2388 223-247 200
10.8-11.2 ≥ 10.2 ≥ 30 28-31
33EH 1130-1170 ≥ 828 ≥ 2388 247-271 200
11.3-11.7 ≥ 10.4 ≥ 30 31-34
35EH 1170-1220 ≥ 860 ≥ 2388 263-287 200
11.7-12.2 ≥ 10.8 ≥ 30 33-36

Physical Characteristics of Sintered NdFeB Magnets

Characteristics Unit Specification
Curie Temp. oC 310~340
Reversible Temp. Coefficient of Br 20~100 %/ oC -0.100 ~ -0.126
Reversible Temp. Coefficient of Hcj 20~100 %/ oC -0.50 ~ -0.65
Density g/cm3 7.3
Vickers Hardness   600
Bending Strength MPa 250
Tensile Strength MPa 80
Compressive Strength MPa 1050
Specific Resistance ̦cm 150
Thermal Conductivity W/(m. oC) 9
Thermal Expansion 10-6 5 (Parallel w. orientation direction)
-1.5 (vertical w. orientation direction)
Specific Heat J/(kg. oC) 460

Features of Sintered NdFeB Magnet:

1. Moderate temperature stability; Extremely resistance to demagnetization.
2. Excellent strength value.
3. Advanced Technology.
4. Effective surface treatment to prevent corrosion.
5. High resistance to demagnetization; Excellent cost to performance ratio; Reasonable temperature stability; Not suitable for application which exposed in high temperature conditions.

Application of Sintered NdFeB:

Especially suitable for used in various electronic motors, engineering equipment, medical equipment, Health bandages and plasters, audio apparatus, Micro products of Auto, National defence, Security systems, Computer, Biology project, Instrument and Meter, household appliances, Magnetic separators, Magnetic resonance imaging, Specialty door catches, Filters & strainers, Sensors Speakers, Microphone/earphone, High performance motors, Brushless motor, Micromotor / servo motor, VCM(voice coil motor) Automobiles, Magnetic coupling Magnetic Chuck, Magnetic toy, Magnetic tools, Other magnetic applications.

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