Neodymium Iron Boron (NdFeb) - Rare Earth: 

(NdFeB) magnets are of the Rare Earth class and have been commercially available since the mid -1980's.  Its popularity has grown rapidly due to its high Maximum Energy Product and its wide range of available shapes, sizes, and grades. 

NdFeB magnets can be manufactured by sintering, compression bonding, injection moulding, and extrusion.  The sintered form holds the highest energy product of up to 48MGOe, while the bonded form holds a lower energy product of up to 10MGOe.  The majority of NdFeB magnets are anisotropic and can only be magnetised in the orientation direction.  

In general, magnetising fields of approximately 30KOe are required to saturate NdFeB magnets.  These magnets are prone to corrosion in humid environments.  For this, liquid epoxy, dry epoxy, nickel plating, zinc plating, and combinations of these coatings may be used as a protective measure.
Surface Treatment Method: Zinc, Nickel, Tin, Phosphor, Silver or Gold Plating Spray Coating Epoxy Resin.

Bonded NdFeB has lower energy properties compared with sintered NdFeB. However, it can be produced with high dimension accuracy and shape complexity.  Normally, there is no finishing required for bonded NdFeB.  To prevent corrosion, the magnet surfaces are treated with an epoxy coating or nickel plating.

Bonded NdFeB magnets are produced by binding rapid-quenching Nd-Fe-B powders which are mixed with plastic resin to form a magnet by compression moulding with epoxy and injection moulding with nylon.  Injection moulding has a particularly useful feature in moulding very complicated shapes and thin-walled parts.  The compression moulded magnets are limited for simple geometries, but they can offer higher magnetic strength than injection moulded magnets because of their relatively high density.  

Note: Additional Neodymium Iron Boron grades, including bonded versions, are available, contact sales.

Typical Magnetic Performance For Sintered NdFeB Magnet

Typical Magnetic Performance For Sintered NdFeB Magnet - PDF