Rare Earth Neodymium Magnets (NdFeB)

Neodymium magnets (NdFeB)  (also known as Rare Earth magnets)   are, size-for-size, the strongest type of any magnet material that is commercially available ,they are stronger than  Samarium Cobalt (SmCo), Alnico and Ferrite.

Neodymium NdFeB magnets are often the ideal first choice for many applications because they offer a maximum performance from the smallest magnet volume. NdFeB magnets should always be coated to guard against the risk of corrosion – NiCuNi, Zinc, NiCuEpoxy and Gold are popular finishes.

Neodymium NdFeB magnets are also know as Neo, Neodymium Iron Boron, NdBFe, NIB, Super Strength, and Rare Earth Magnets .  They are an alloy of Neodymium, Iron and Boron. There are 55 NdFeB magnets commonly in use. They are used in nearly all Industries:- Automotive, Aerospace, Wind Turbine, Military, White Goods, Lighting, Food Preparation, Separation, Motor and Generator Industries are just a few example Industries.

Our NdFeB magnets are all REACH and ROHS compliant. They do not contain any SVHC and the NdFeB  Neodymium is produced to ISO9001 and ISO14001 Quality Control Standards. NdFeB Neodymium magnets are usually supplied in blocks, discs, rings, arcs, spheres, triangles, trapezoids and many other shapes as stock and custom items. We manufacture also manufacture  NdFeB magnet assemblies. 

The most common range of NdFeB (Nxx versions) will usually operate at up to +80 degrees C. Higher temperature versions (NxxM, NxxH, NxxSH, NxxUH, NxxEH, NxxVH/AH) are rated from up to +100 degrees C to a maximum of up to +230 degrees C. 

All  Neodymium NdFeB or Rare Earth magnets should have some form of protective coating to minimise and ideally prevent corrosion. Uncoated is not advised. The default / standard protective coating is Ni−Cu−Ni plating. Other coatings/finishes exist (over 40 finishes are currently available). Where maximum corrosion resistance is required for NdFeB, consider using the increased corrosion resistance range of NdFeB alloys.

 

Advantages & Disadvantages of Neodymium Magnets (NdFeB)

Advantages 

  • Maximum performance relative to size. Ideal for restricted space or compact applications. 
  • Can be used in extremely cold conditions (e.g. in liquid nitrogen).
  • Standard Neodymium NdFeB Magnet is rated to +80 degrees C (176F) maximum. Can be rated to +100 (212F), +120 (248F), +150 (302F), +180 (356F), +200 (392F) and +220/230 degrees C (428/446F) with higher Hci versions.
  • High coercivity (Hci) to resist demagnetisation.
  • NxxT and L-NxxT alloys have better corrosion resistance than standard NdFeB but still needs coating.

Disadvantages

  • Requires a protective coating to prevent the iron in the alloy from corroding (rusting).
  • NxxT and L-NxxT alloys are much more expensive and will still show signs of corrosion.
  • Higher temperature versions contain more Dy element increasing their cost.
  • Nd and Dy prices affect the production cost.
  • Above 150-180 deg C (302-356F), SmCo may be better.
rare earth neodymium magnets for automotive applications

Typical Applications for Rare Earth Neodymium Magnets

  • Magnets for Motor and Generator drives
  • Meters
  • Automotive (clamps, sensors)
  • Precision Magnets for Aerospace
  • Fine particle Magnetic Separation (rods, grids, etc) – 10-12kG (22-26lbs) systems
  • High-performance magnetic clamps and pot magnets

Example: An automotive company required a thin disc shaped magnetic clamp to hold two mild steel sections together with maximum force. Even high-grade Neodymium NdFeB disc and ring magnets did not provide enough pull strength performance. Our solution was a dual polarity Neodymium (NdFeB) disc magnet within a ring assembly creating a perfect magnetic circuit with a pull force meeting the specification.

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