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:
- Very high residual flux density (Br)
- Coercive field strength (HcJ)
- 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.
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. Strip Casting
2. Hydrogen Decrepitation
3. Jet Milling
5. Sintering & Annealing
6. Performance Testing
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)
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)
- MRI (Magnet Resonance Imaging)
- Sensors for hearing aids
- Blood and infusion pumps
- Cell phones
- Switches and relays
- Air conditioning
- Mass spectrometer
- NMR (Nuclear Magnetic Resonance) measuring system
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