What is NdFeB magnet?

What is NdFeB magnet?

NdFeB magnet is the strongest permanent magnet material in contemporary magnets. Its BHmax value is 5~12 times that of ferrite magnet, 3~10 times that of Al-Ni-Co magnet, and its coercivity is 5~10 times that of ferrite magnet and 5~15 times that of Al-Ni-Co magnet. Its potential magnetic ability is very high, and it can absorb 640 times of its own weight.

Because the main raw material of NdFeB magnets is so cheap, rare earth Nd can be stored 10-16 times more than samarium, making it much cheaper than samarium cobalt magnets. NdFeB magnets have better mechanical properties than samarium cobalt and aluminum-nickel-cobalt magnets, making them easier to cut, drill and process complex shapes. NdFeB magnets have disadvantages such as poor temperature performance, high temperature magnetic loss and low maximum working temperature. Generally at about 80 degrees Celsius, in the special treatment of the magnet, its highest working temperature up to two hundred degrees Celsius.

Corrosion is one of the main drawbacks of the material, which contains large amounts of neodymium and iron. Therefore, the surface of NdFeB magnet must be coated. Nickel (Ni), zinc (Zn), gold (Gold), chromium (Cr), epoxy resin (Epoxy) can be electroplated. NdFeB magnets are widely used in aerospace, electronics, electromechanical, medical and other fields. It is increasingly used in non-technical fields, such as magnets, toys, jewelry and so on.

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