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Basic introduction of the chemical composition of NdFeB

Release Time:2019-09-03

Source: Shanghai Fuyu Magnetic Industry Co., Ltd.


  • 询价

  The NdFeB permanent magnet material is a permanent magnet material based on the intermetallic compound Nd2Fe14B. The main components are rare earth elements (Nd), iron (Fe), and boron (B). Among them, the rare earth element is mainly niobium (Nd). In order to obtain different properties, some rare earth metals such as Dy and Pr can be replaced, and iron can also be replaced by other metal parts such as cobalt (Co) and aluminum (Al). The boron content is small, but plays an important role in forming a tetragonal crystal intermetallic compound, so that the compound has high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

  The third generation rare earth permanent magnet NdFeB is the most powerful permanent magnet in contemporary magnets. Its main raw materials are rare earth metals 29%-32.5% metal element iron 63.95-68.65% non-metallic element boron 1.1-1.2% 0.6-8% 0.3-0.5% aluminum 0.3-0.5% copper 0.05-0.15% and other elements.


  1. Usually, a magnet of the same specification is placed on a plane that can be adsorbed, such as a patch, a blade, an iron gate, etc., and the size of the magnetic force is discriminated by hand.

  2. Using electronic scales: Magnets with weak magnetic force are generally related to their density. If the density is small, the magnetic force is relatively small. If the weight is heavy, the magnetic force is relatively large. On the contrary, the light weight is small. If the magnet is required to be relatively high, the instrument is required. Tested.


  Each product is divided into several grades according to the maximum magnetic energy product size.

  NdFeB magnetic material grades are: N35-N52, 35M-50M, 30H-48H, 30SH-45SH, 28UH-35UH, 28EH-35EH.

  Example of grade: 048021 denotes sintered NdFeB permanent magnet material with (BH)max of 366~398kj/m3 and Hcj of 800KA/m.

  The grade of sintered NdFeB permanent magnet material consists of three parts: the main name and two kinds of magnetic characteristics. The first part is the main name, which consists of the chemical symbol ND of the element, the chemical symbol FE of the iron element and the chemical symbol B of the boron element. The second part is the number in front of the line, which is the nominal value of the maximum magnetic energy product (BH)max of the material (in kj/m3), the third part is the number after the oblique line, and the coercive force value of the magnetic polarization (in One tenth of KA/m), the values are rounded off.

  Example of grade: NdFeb380/800 indicates a sintered NdFeB permanent magnet material with (BH)max of 366~398kj/m3 and Hcj of 800KA/MR.

  NdFeB surface treatment:

  1, phosphating;

  2, inorganic salt passivation;

  3, electroplating;

  4, electrophoresis;

  5, vacuum deposition;


  Sintered NdFeB permanent magnet materials have excellent magnetic properties and are widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. More common are permanent magnet motors, speakers, magnetic separators, Computer disk drive, magnetic resonance imaging equipment, etc.

  Curie temperature

  The Curie temperature of the ferrite is 465 ° C,

  The Curie temperature of NdFeB is 320°C-460°C.

  The alumino-nickel cobalt has a Curie temperature of 800 ° C.

  The Curie temperature of samarium cobalt is 700-800 °C

  The iron chrome cobalt Curie temperature is 680 degrees

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