SINTERED NdFeB PERMANENT MAGNETS

Driven by the high costs of samarium cobalt magnets, the NdFeB alloy was first discovered in 1982. Nowadays, this alloy is termed “Neo” and is one of the strongest commercial permanent magnets.

Sintered NdFeB permanent magnets display the following excellent magnetic qualities:

  1. Very high residual flux density (Br)
  2. Coercive field strength (HcJ)
  3. Magnetic energy density (BHmax)

Because of their versatility, strong magnetic potential and comparatively small size, sintered NdFeB permanent magnets are today the most widespread magnetic materials on the market.

Magnets consisting only of Nd, Fe and B demagnetize themselves partially at temperatures as low as 80°C and are very sensitive to corrosion. By combining them with other rare earth elements, in particular, Dy or Tb, temperature stability can be increased up to and above 200°C. To increase corrosion stability, other alloy components such as Co are often added. This removes the major restrictions for the use of NdFeB magnets.

You can find our NdFeB alloys and their magnetic qualities under Download.

MANUFACTURING PROCESS

Sintered NdFeB permanent magnets belong to the group of polycrystalline raw materials and are manufactured in a patented sintering process. Yunsheng is one of the Chinese licensees of Sumitomo Special Metals, who produce magnets in the powder metallurgy sintering process:

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

Sintered NdFeB permanent magnets are highly subject to corrosion and require an outer coating (surface treatment) that depends on their type of application. Find more information on the coating process here.

Application of sintered NdFeB magnets

Compared to other hard magnetic materials such as for instance AlNiCo, hard ferrites, SmCo permanent magnets or plastic bonded magnets, NdFeB magnets have a range of outstanding magnetic qualities, meaning that their everyday use is now essential.

Motors and generators

  • Servo drives
  • DC machines
  • Linear drives and large machines (for example motors for rail and ship drives or wind and hydropower generators)

Consumer electronics

  • Loudspeakers
  • Cell phones
  • Computers

Automobile technology and sensors

  • ABS systems (e.g. for engine, transmission and wheel speed)
  • Acceleration sensors (ESP, airbag)
  • Position sensors (throttle position, injection systems, camshaft, crankshaft, fuel gages)

Household technology

  • Switches and relays
  • Air conditioning

Medical technology

  • MRI (Magnet Resonance Imaging)
  • Sensors for hearing aids
  • Blood and infusion pumps

Measuring instruments

  • Scales
  • Microscope
  • Mass spectrometer
  • NMR (Nuclear Magnetic Resonance) measuring system

You require a magnet solution, but don't know which one?

Get in touch with us; we will be happy to advise you on the appropriate solution for your area of application.

Menu