Sintered NdFeB magnet

sintered ndfeb magnet

The most powerful rare earth 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 iron boron magnets lose -0.09 ~ -0.13% of Br/C. Their working stability is under 80C for low Hci. Neodymium magnets and above 200C for high Hci Neodymium iron boron. 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.

Features of Sintered NdFeB Magnet:

Moderate temperature stability; Extremely resistance to demagnetization. Excellent strength value. Advanced Technology. Effective surface treatment to prevent corrosion. 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.

TYPE Remanence Br Coercivforce bHc Intrinsic coercive force iHc Max. energy product (BH) max Working Temperature
KGs T KOe KA/m KOe KA/m MGOe KJ/m³
N30 10.8-11.2 1.08-1.12 9.8-10.5 780-836 ≥12 ≥955 28-30 223-239 ≤80
N33 11.4-11.7 1.14-1.17 10.5-11.0 836-876 ≥12 ≥955 31-33 247-263 ≤80
N35 11.7-12.1 1.17-1.21 10.8-11.5 860-915 ≥12 ≥955 33-35 263-279 ≤80
N36 11.9-12.2 1.19-1.22 10.8-11.5 860-915 ≥12 ≥955 34-36 271-287 ≤80
N38 12.2-12.6 1.22-1.26 10.8-11.5 860-915 ≥12 ≥955 36-38 287-303 ≤80
N40 12.6-12.9 1.26-1.29 10.5-11.0 836-876 ≥12 ≥955 38-40 303-318 ≤80
N42 12.9-13.2 1.29-1.32 10.5-11.0 836-876 ≥12 ≥955 40-42 318-334 ≤80
N43 13.0-13.3 1.30-1.33 10.5-11.0 836-876 ≥12 ≥955 41-43 326-342 ≤80
N45 13.3-13.7 1.33-1.37 10.5-11.0 836-876 ≥12 ≥965 43-45 342-358 ≤80
N48 13.8~14.2 1.38~1.42 ≥10.5 ≥835 ≥12 ≥955 46~49 366~390 ≤80
N50 13.8~14.5 1.38~1.45 ≥10.5 ≥835 ≥11 ≥955 47~51 374~406 ≤80
N52 14.3~14.8 1.43~1.48 ≥10.8 ≥860 ≥11 ≥876 50~53 398~422 ≤80
N27M 10.2-10.6 1.02-1.06 9.6-10.1 764-804 ≥15 ≥1194 25-27 199-215 ≤100
N30M 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥15 ≥1194 28-30 223-239 ≤100
N33M 11.4-11.7 1.14-1.17 10.5-11.0 844-884 ≥15 ≥1194 31-33 247-263 ≤100
N35M 11.7-12.1 1.17-1.21 10.8-11.5 860-915 ≥15 ≥1114 33-35 263-279 ≤100
N36M 11.9-12.2 1.19-1.22 11.1-11.6 884-923 ≥15 ≥1194 34-36 271-287 ≤100
N38M 12.2-12.6 1.22-1.26 10.8-11.5 860-915 ≥14 ≥1114 36-38 287-303 ≤100
N40M 12.6-12.9 1.26-1.29 10.8-11.5 860-915 ≥14 ≥1114 38-40 303-318 ≤100
N42M 12.9-13.2 1.29-1.32 10.8-11.4 860-907 ≥14 ≥1114 40-42 318-334 ≤100
N45M 13.3-13.7 1.33-1.37 10.8-11.4 860-907 ≥17 ≥1114 43-45 334-358 ≤100
N48M 13.6~~14.0 1.36~1.40 ≥11.8 ≥939 ≥14 ≥1114 46~49 366~390 ≤100
N50M 14.0~14.5 1.39~1.43 ≥13.0 ≥1033 ≥14 ≥1114 48~51 382~406 ≤100
N27H 10.2-10.6 1.02-1.06 9.6-10.1 764-804 ≥17 ≥1353 25-27 199-215 ≤120
N30H 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥17 ≥1353 28-30 223-239 ≤120
N33H 11.4-11.7 1.14-1.17 10.6-11.1 844-884 ≥17 ≥1353 31-33 247-263 ≤120
N35H 11.7-12.1 1.17-1.21 10.8-11.5 860-915 ≥17 ≥1353 33-35 263-279 ≤120
N36H 11.9-12.2 1.19-1.22 11.1-11.6 884-923 ≥17 ≥1353 34-36 271-287 ≤120
N38H 12.2-12.6 1.22-1.26 11.5-12.0 915-955 ≥17 ≥1353 36-38 287-303 ≤120
N40H 12.6-12.9 1.26-1.29 11.5-12.0 915-955 ≥17 ≥1353 38-40 303-318 ≤120
N42H 12.9-13.2 1.29-1.32 11.5-12.0 915-955 ≥17 ≥1353 40-42 318-334 ≤120
N45H 13.2~13.8 1.26~1.32 ≥12.4 ≥987 ≥17 ≥1353 42~46 335~366 ≤120
N46H 13.4~13.8 1.34~1.38 ≥12.8 ≥1019 ≥17 ≥1353 44~47 350~374 ≤120
N48H 13.6~14.2 1.36~1.42 ≥12.8 ≥1019 ≥16 ≥1274 45~48 358~382 ≤120
N27SH 10.2-10.6 1.02-1.06 9.6-10.1 764-804 ≥20 ≥1592 25-27 199-215 ≤150
N30SH 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥20 ≥1592 28-30 223-239 ≤150
N33SH 11.4-11.7 11.4-11.7 10.6-11.1 844-884 ≥20 ≥1592 31-33 247-263 ≤150
N35SH 11.7-12.1 1.17-1.21 10.8-11.5 860-915 ≥20 ≥1595 33-35 263-279 ≤150
N38SH 12.1-12.5 1.21-1.25 10.8-11.5 860-915 ≥20 ≥1592 36-38 287-302 ≤150
N40SH 12.6-12.9 1.26-1.29 10.8-11.5 860-915 ≥20 ≥1592 38-40 303-318 ≤150
N42SH 12.8~13.2 1.28~1.32 ≥11.8 ≥939 ≥20 ≥1672 40~43 320~343 ≤150
N45SH 13.2~13.8 1.32~1.38 ≥12.6 ≥1003 ≥20 ≥1592 43~46 342~366 ≤150
N25UH 9.8-10.2 0.98-1.02 9.2-9.6 732-764 ≥25 ≥1990 23-25 183-199 ≤180
N28UH 10.4-10.8 1.04-1.08 9.8-10.2 780-812 ≥25 ≥1990 26-28 207-223 ≤180
N30UH 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥25 ≥1990 28-30 223-239 ≤180
N35UH 11.7-12.1 1.17-1.21 10.5-11.2 836-890 ≥25 ≥1989 33-35 263-278 ≤180
N38UH 12.1-12.5 1.21-1.25 ≥11.4 ≥907 ≥25 ≥1990 36-39 287-310 ≤180
N40UH 12.5-12.8 1.25-1.28 ≥11.4 ≥907 ≥25 ≥1990 38-41 302-326 ≤180
N25EH 9.8-10.2 0.98-1.02 9.2-9.6 732-764 ≥30 ≥2387 23-25 183-199 ≤200
N28EH 10.4-10.8 1.04-1.08 9.8-10.2 780-812 ≥30 ≥2387 26-28 207-223 ≤200
N30EH 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥30 ≥2387 28-30 223-239 ≤200
N35EH 11.7-12.1 1.17-1.21 ≥10.2 ≥812 ≥30 ≥2388 33-36 263-287 ≤200
N38EH 12.1-12.5 1.21-1.25 ≥11.4 ≥907 ≥30 ≥2388 36-39 287-310 ≤200
N30AH 10.8~11.3 1.08~1.13 ≥10.2 ≥812 ≥35 ≥2785 28~32 223~255 ≤220
N33AH 11.2~11.7 1.12~1.17 ≥10.2 ≥812 ≥35 ≥2785 31~34 247~271 ≤220
Other Physical Properties (NdFeB)
Temp.Coeff.of Br -0.11%/℃ Temp.Coeff.of iHc -0.60%/℃
Density 7.4~7.6g/cm3 Electrical resistivity 144μΩ/cm
Vickers Hardness 600/Hv Flexural Strength 25kg/mm
Tensile Strength 8.0kg/mm2 Coeff.of Thermal Expansion 4×10-6%/℃
Specific Heat 0.12kCal/(kg.℃) Thermal Conductivity 7.7w/(m℃)
Yound's Modulus 1.6×1011N/m2 Rigidity 0.64N/m2
Poisson's Ratio 0.24 Compressibility 9.8×10-12m2/N
Curie Temperature 310~340℃