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NdFeB Magnets
NdFeB Material Grade
Demagnetization Curves
Surface Treatments/Dimension & Tolerance
Pricing of Sintered NdFeB Magnets
Data Sheet of NdFeB Magnets (PDF)
NdFeB Block Magnets (PDF)
NdFeB Disc/Cylinder Magnets (PDF)
NdFeB Ring Magnets (PDF)
NdFeB Assembly
Customer Specific NdFeB Magnets
Magnetization Direction of NdFeB Magnets
More Information on NdFeB Magnets
Other Magnetic Materials
Magnetic Devices

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Pull force between two disc magnets
Pull force between disc magnet and flat
Pull force between two block magnets
Pull force between block magnet and flat
Magnetic field of a Disc magnet
Magnetic field of a block magnet

Sintered and Polymer-bonded NdFeB Magnets

Sintered NdFeB magnets are made with several steps. At first, a alloy is formulated based on the properties of final permanent magnets supposed to reach. The alloy is produced in a vacuum furnace. Then the alloy is crushed into a powder form. Sintered NdFeB permanent magnets are formed by powder metallurgical process. These magnets can be die pressed or isostatically pressed. During the pressing process, magnetic fields are applied with assistance of specially designed fixture to align magnetic "domains" and optimize the magnetic performance of these magnets. Then pressed magnets are placed into a furnace under protective atmosphere for sintering. After sintering the magnet shape is rough, and need to be machined and ground to achieve desired shape and size. A surface coating is usually applied on NdFeB magnets. Zinc or nickel coating is common used as a protective layer. Other materials such as cadmium chromate, aluminum chromate, tin or polymer (epoxy) are also used for this purpose.

Polymer-bonded magnets can be produced with close tolerances off tool, with little or no finishing required. Polymer-bonded NdFeB permanent magnets can be made by both compression moulding and injection moulding. The sintered magnets usually require some finishing operations in order to hold close mechanical tolerances. The sintered magnets, however, provide better magnetic properties than bonded magnets.

Further Information on NdFeB Magnets
Further Information on Permanent Magnets

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