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Sintered NdFeB Magnets

 Sintered NdFeB Rare Earth Permanent Magnet Overview

 Sintered NdFeB Rare Earth Magnet is a kind of functional material that is necessary for basic industry and frontier science. In order to keep up with the rapid developing trend of NdFeb rare earth magnets production and application in the world, the factory backed by its year's professional experience and convenient well-situated facility, continuously promotes the development and production in the field.

 NdFeB magnet is mainly made of Neodymium Iron and Boron,with excellent magnetic property abundant raw material and reasonable prices, NdFeB Magnet can be used as an ideal magnet in mini-motor Permanent magnetic resonance sound device magnetic suspension system,magnetic transmission machine and iatrical apparatus and etc.For NdFeB,its surface is usually treatd with some special methods.The surface treatment method include Zine Nickel Tin Silver Gold plating Phosphor and Spray Epoxy Resin etc. 

Wide Applications

With its excellent magnetic property, abundant raw material and reasonable prices, rare-earth permanent magnet can be used as an ideal magnet in mini-motor, permanent-magnet instrument,electronic industry, auto industry, petro-chemical industry,nuclear magnetic resonance,sound device, magnetic suspension system, magnetic transmission machine and magnetotherapy apparatus etc.

NdFeB magnets Chemical composition:

Chemical analysis for sintering NdFeB magnets material based on intermetallic compounds RE2Fe14B,main composition is NdFeB magnet is (RE), (Fe) (B),thereinto thulium (Nd), in order to obtain different performance can instead by thulium of (Dy),(Pr) etc. also other metal can instead Fe,for example (Co), (Al) etc., smaller content of boron, but it affect tetragonal crystal intermetallics, making the intermetallics with high magnetization,uniaxial anisotropy and curie temperature.
NdFeB magnets Making process:
NdFeB magnet use Powder Metallurgy Process, proportion of material such as: neodymium, dysprosium, iron, cobalt, niobium, praseodymium, aluminum, iron, and boron etc., through Mid-frequency Induction Furnace smelting to alloy steel ingot, then broken into power of 3~5um,and forming mold in magnetic field, the green bodies sintering dense and tempering in Vacuum Sintering Furnace, that can earn magnetic properties of blank of permanent magnet. After grinding, drilling, cutting and other processing, last via surface finish, it is good NdFeB magnet.

Magnetic Properties of Sintered NdFeB Magnet

Grade Remanence Coercivity Force Intrinsic Coercive Force Max. Energy Product maximum Operating Temp.
Br Hcb Hcj  BH  © max
mT kGs kA/m kOe kA/m kOe kJ/m3 MGOe
N27 1030-1080 10.3-10.8 ≥ 796 ≥ 10.0 ≥ 955 ≥ 12 199-231 25-29 80 ° C
N30 1080-1130 10.8-11.3 ≥ 796 ≥ 10.0 ≥ 955 ≥ 12 223-247 28-31 80 ° C
N33 1130-1170 11.3-11.7 ≥ 836 ≥ 10.5 ≥ 955 ≥ 12 247-271 31-34 80 ° C
N35 1170-1220 11.7-12.2 ≥ 868 ≥ 10.9 ≥ 955 ≥ 12 263-287 33-36 80 ° C
N38 1220-1250 12.2-12.5 ≥ 899 ≥ 11.3 ≥ 955 ≥ 12 287-310 36-39 80 ° C
N40 1250-1280 12.5-12.8 ≥ 907 ≥ 11.4 ≥ 955 ≥ 12 302-326 38-41 80 ° C
N42 1280-1320 12.8-13.2 ≥ 915 ≥ 11.5 ≥ 955 ≥ 12 318-342 40-43 80 ° C
N45 1320-1380 13.2-13.8 ≥ 923 ≥ 11.6 ≥ 955 ≥ 12 342-366 43-46 80 ° C
N48 1380-1420 13.8-14.2 ≥ 923 ≥ 11.6 ≥ 876 ≥ 12 366-390 46-49 80 ° C
N50 1400-1450 14.0-14.5 ≥ 796 ≥ 10.0 ≥ 876 ≥ 11 382-406 48-51 60 ° C
N52 1430-1480 14.3-14.8 ≥ 796 ≥ 10.0 ≥ 876 ≥ 11 398-422 50-53 60 ° C
30M 1080-1130 10.8-11.3 ≥ 796 ≥ 10.0 ≥ 1114 ≥ 14 223-247 28-31 100 ° C
33M 1130-1170 11.3-11.7 ≥ 836 ≥ 10.5 ≥ 1114 ≥ 14 247-263 31-33 100 ° C
35M 1170-1220 11.7-12.2 ≥ 868 ≥ 10.9 ≥ 1114 ≥ 14 263-287 33-36 100 ° C
38M 1220-1250 12.2-12.5 ≥ 899 ≥ 11.3 ≥ 1114 ≥ 14 287-310 36-39 100 ° C
40M 1250-1280 12.5-12.8 ≥ 923 ≥ 11.6 ≥ 1114 ≥ 14 302-326 38-41 100 ° C
42M 1280-1320 12.8-13.2 ≥ 955 ≥ 12.0 ≥ 1114 ≥ 14 318-342 40-43 100 ° C
45M 1320-1380 13.2-13.8 ≥ 995 ≥ 12.5 ≥ 1114 ≥ 14 342-366 43-46 100 ° C
48M 1360-1430 13.6-14.3 ≥ 1027 ≥ 12.9 ≥ 1114 ≥ 14 366-390 46-49 100 ° C
50M 1400-1450 14.0-14.5 ≥ 1033 ≥ 13.0 ≥ 1114 ≥ 14 382-406 48-51 100 ° C
30H 1080-1130 10.8-11.3 ≥ 796 ≥ 10.0 ≥ 1353 ≥ 17 223-247 28-31 120 ° C
33H 1130-1170 11.3-11.7 ≥ 836 ≥ 10.5 ≥ 1353 ≥ 17 247-271 31-34 120 ° C
35H 1170-1220 11.7-12.2 ≥ 868 ≥ 10.9 ≥ 1353 ≥ 17 263-287 33-36 120 ° C
38H 1220-1250 12.2-12.5 ≥ 899 ≥ 11.3 ≥ 1353 ≥ 17 287-310 36-39 120 ° C
40H 1250-1280 12.5-12.8 ≥ 923 ≥ 11.6 ≥ 1353 ≥ 17 302-326 38-41 120 ° C
42H 1280-1320 12.8-13.2 ≥ 955 ≥ 12.0 ≥ 1353 ≥ 17 318-342 40-43 120 ° C
45H 1300-1360 13-13.6 ≥ 963 ≥ 12.1 ≥ 1353 ≥ 17 326-358 43-46 120 ° C
48H 1370-1430 13.7-14.3 ≥ 995 ≥ 12.5 ≥ 1353 ≥ 17 366-390 46-49 120 ° C
30SH 1080-1130 10.8-11.3 ≥ 804 ≥ 10.1 ≥ 1592 ≥ 20 223-247 28-31 150 ° C
33SH 1130-1170 11.3-11.7 ≥ 844 ≥ 10.6 ≥ 1592 ≥ 20 247-271 31-34 150 ° C
35SH 1170-1220 11.7-12.2 ≥ 876 ≥ 11.0 ≥ 1592 ≥ 20 263-287 33-36 150 ° C
38SH 1220-1250 12.2-12.5 ≥ 907 ≥ 11.4 ≥ 1592 ≥ 20 287-310 36-39 150 ° C
40SH 1240-1280 12.5-12.8 ≥ 939 ≥ 11.8 ≥ 1592 ≥ 20 302-326 38-41 150 ° C
42SH 1280-1320 12.8-13.2 ≥ 987 ≥ 12.4 ≥ 1592 ≥ 20 318-342 40-43 150 ° C
45SH 1320-1380 13.2-13.8 ≥ 1003 ≥ 12.6 ≥ 1592 ≥ 20 342-366 43-46 150 ° C
28UH 1020-1080 10.2-10.8 ≥ 764 ≥ 9.6 ≥ 1990 ≥ 25 207-231 26-29 180 ° C
30UH 1080-1130 10.8-11.3 ≥ 812 ≥ 10.2 ≥ 1990 ≥ 25 223-247 28-31 180 ° C
33UH 1130-1170 11.3-11.7 ≥ 852 ≥ 10.7 ≥ 1990 ≥ 25 247-271 31-34 180 ° C
35UH 1180-1220 11.8-12.2 ≥ 860 ≥ 10.8 ≥ 1990 ≥ 25 263-287 33-36 180 ° C
38UH 1220-1250 12.2-12.5 ≥ 876 ≥ 11.0 ≥ 1990 ≥ 25 287-310 36-39 180 ° C
40UH 1240-1280 12.5-12.8 ≥ 899 ≥ 11.3 ≥ 1990 ≥ 25 302-326 38-41 180 ° C
28EH 1040-1090 10.4-10.9 ≥ 780 ≥ 9.8 ≥ 2388 ≥ 30 207-231 26-29 200 ° C
30EH 1080-1130 10.8-11.3 ≥ 812 ≥ 10.2 ≥ 2388 ≥ 30 223-247 28-31 200 ° C
33EH 1130-1170 11.3-11.7 ≥ 836 ≥ 10.5 ≥ 2388 ≥ 30 247-271 31-34 200 ° C
35EH 1170-1220 11.7-12.2 ≥ 876 ≥ 11.0 ≥ 2388 ≥ 30 263-287 33-36 200 ° C
38EH 1220-1250 12.2-12.5 ≥ 899 ≥ 11.3 ≥ 2388 ≥ 30 287-310 36-39 200 ° C

1.        以上磁性能参数均为室温下的数据; 

The above-mentioned data of magnetic parameters are given at room temperature.

2.        以上牌号为基本牌号,在基本牌号基础上衍生 T 系列(如 35SHT 等)和 L-T 系列牌号(如 L-38SHT 等),其主要磁性能同对应的基本牌号的主要磁性能。

The above-mentioned grades are our basic grade. We also have T (for instance 35SHT, etc.) and L-T (for instance L-38SHT, etc.) series grades which are derived from these basic grades. The main properties of the derived grades are corresponding to those of the basic grades.

3.        最高工作温度定义是将规定尺寸(稀土永磁为φ 10 × 7 )的样品加热到某一恒定的温度,长时间放置(一般取 1000h ),然后将样品冷却到室温,其开路磁通不可逆损失小于 5% 的最高保温温度定义为该永磁材料的最高工作温度,符号为 Tw ,单位为 K 或℃。

最高工作温度一般依赖于牌号,工作点( Pc 值),镀层和环境等因数。

The max working temperature,which the sampling specification(Permanent Magnet:φ10×7) to heat up to the regular temperature for lay of long time(general 1000H.).   Then take this sampling to cooling attained  room temperature.The irreversible loss of magnetic flux is less than 5%,This max keep temperature definiteness which is the permanent material should be acception by the max temperature. The sign:Tw,The unit:K or

The maximum working temperature of magnet is changeable due to grade, operating point, coating and environmental factors.

Physical Properties of Sintered NdFeB Magnets

Temp.Coeff.of Br -0.11%/ °C Temp.Coeff.of Hc -0.60%/ °C
Density 7.3-7.5g/cm 3 Electrical Resistivity 114 .cm
 Vickers Hardness 600Hv Flexural Resistivity 25kg/mm
Tensile Strength 8.0Kg/mm2  Coeff. Of Thermal Expansion 4X10 -6 / °C
Specific Heat 0.12Kcal/Kg Thermal Conductivity 7.7kcal/[m.h. °C
Young ¡s Modulus 1.6X10[11]N/m2 Rigidity 0.64N/m2
Poisson¡¯s Ratio 0.24  Compressibility 9.8x10-12m2/N
Curie Temperature 310-340 °C