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Sintered Neodymium Iron Boron (NdFeB) magnets offer the highest energy per unit volume of any permanent magnet material, mostly an iron based alloy.
It is manufactured in numerous energy and temperature grades, with high energy range from 33MGOe to 48MGOe with wonderful coercive force, even 50MGOe in the laboratory.
Being less prone to chipping during handling, and has lowertemperature coefficient of magnetic properties than Ceramic magnets, higher than SmCo type rare earth magnets, but less expensive, and mechanically stronger and less brittle than SmCo.
However, being mostly an iron based alloy, NdFeB type rare earth magnet is much more prone tosurface oxidation or rust. To eliminate such a problem, the user should consider magnet coating,plating, or suitable surface treatment. So for most applications, coating or plating is recommended.
And also, Because of the brittle nature and high attractive forces generated by NdFeB magnets, great care is needed during handling.Permanent NdFeB magnets are widely used in apparatus, instruments, assemblies where a strongmagnetic field is needed, such as motors, sensors, microphones, electro-acoustics, magnetic separation, magnetic suckers and magnetic therapy wraps.
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