The third-generation rare earth permanent magnet NdFeB is the strongest permanent magnet in contemporary magnets. Its BHmax value is 5-12 times that of ferrite magnets, 3-10 times that of alnico magnets; its coercive force is equivalent to 5-10 times that of ferrite magnets, and 5-aluminum magnet magnets are 5- 15 times, its potential magnetic performance is extremely high, and it can absorb a weight equivalent to 640 times its own weight.
Since the main raw material iron of the NdFeB magnet is very cheap, the storage amount of the rare earth lanthanum is 10-16 times higher than that of the yttrium iron boron magnet, so the price is much lower than that of the samarium cobalt magnet.
NdFeB magnets have better mechanical properties than samarium-cobalt magnets and Al-N-cobalt magnets, making them easier to cut and drill and complex shape processing.
The insufficiency of NdFeB magnets is their poor temperature performance. The magnetic loss is high at high temperatures and the maximum operating temperature is low. It is usually around 80 degrees Celsius. It has a maximum working temperature of 200 degrees Celsius in specially treated magnets.
Since the material contains a large amount of bismuth and iron, it is also a major weakness of rust. Therefore, the neodymium iron boron magnet must be surface coated. Electroless nickel (Ni), zinc (Zn), gold (Au), chromium (Cr), epoxy (Epoxy) and the like.