NdFeB(Rare Earth)Magnet

Neodymium Iron Boron (NdFeB) magnets are the most powerful magnets available today. They possess maximum energyproduct over 50MGOe and wonderful coercive force. As the third generation of rare earth permanent magnets, NdFeB magnets are less brittle than their predecessors. They have the best prices relative to their high magnetic properties.
NdFeB magnets are available in sintered as well as bonded forms. The bonded form of the material can be produced with close tolerances, with little or no finishing required. The energy product of the bonded form is much lower than that of the sintered form-up to 12 MGOe. The sintered form usually requires some finishing operations in order to hold close mechanical tolerances.
Characteristics：
·Extreme strong residual induction.
·Excellent demagnetization resistance capability.
·Good prices relative to their high magnetic properties.
·Coating is needed for sintered NdFeB magnet.
·Not suitable for high temperature working condition.
Machining And Tolerances：
NdFeB magnets are brittle, though not as brittle as the SmCo magnets. Machining operations should be completed before coating or plating, using diamond tools, and coolants must be used in the process to avoid spontaneous combustion of powder. Standard tolerances for NdFeB magnets are +/-.005” for ground dimensions. Close tolerances are also available by abrasive grinding and cutting.
Temperature Effects：Magnetic properties of NdFeB magnets will deteriorate rapidly if temperature is higher than their maximum operating temperature. So several grades have been developed to meet specific operating requirements. Please refer to our chart of magnetic properties to compare the characteristics of each grade. Before choosing a NdFeB magnet be sure to consider your application’s maximum operating temperature.
Surface Treatments：NdFeB materials are easy to be eroded and oxidized. Painting, coating, or plating is therefore highly recommended for sintered NdFeB magnets. Nickel, Zinc, or Color Zinc plating provides good corrosion resistance for NdFeB magnets. Gold and Silver plating are available for customer’s specific requirements sometimes. A variety of organic coatings have also been successfully developed, exhibiting good corrosion resistance characteristics. For especially harsh environments, it may be advisable to use a combination of coating techniques, or to encapsulate the material in a sealed housing.
Magnetization：NdFeB magnets require extremely high magnetizing fields and particular consideration must be given to this when designing complex assemblies. In general, magnetizing fields of about 30 KOe are required to saturate NdFeB magnets. NdFeB can be magnetized in any direction as long as it is aligned properly. Special fixtures are required for multipolar magnetization. Rare earth magnets are mechanically weak, and magnetically very strong. They must therefore be handled very carefully to avoid damage and injury to personnel handling the magnets.
Applications：Widely used in aviation, instruments, meters, sensors, motors, speakers, microphones, electronics, magnetic separation, medicine, machines, etc.