Hot Pressed Magnet

13/08/2022
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Hot pressed NdFeb magnets are produced through compression and extrusion deformation by rapidly quenched NdFeB powder under high temperature, which can be divided into hot pressed isotropic NdFeB magnet and hot extruded anisotropic NdFeB magnet. The manufacturing process of hot pressed magnet is different from the traditional sintering and gluing that hot pressing and deformation technology requires no orientation mechanism during the molding process. They have much higher magnetic properties than traditionally bonded magnets and have excellent mechanical properties to allow tight tolerances .The hot-extruded anisotropic NdFeB magnet is mainly anisotropic radially -oriented ring magnet, which have an excellent corrosion resistance due to its nanocrystalline structure and the absence of internal porosity.

 

Advantages of Hot Pressed Magnet

  1. An excellent resistance to heat, managing to withstand up to about 180deg
  2. Higher (BH)max value on the radial direction
  3. Compare to traditional sintered magnets, radially oriented ring magnets with small-sized, high L/D ratio, and thin-walled are easier to be made from hot press magnets
  4. Need less heavy rare earth elements (HREEs) to enhance the thermal stability
  5. Magnetic field strength waveform depends on magnetization fixture only
  6. Superior waveform homogeneity and deviation angle are available

What is the application of hot pressed magnet?

It is used in electric power steering (EPS), AC/DC servo motors, power tools, etc.

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