The third generation rare earth permanent magnet neodymium ferroboron is the most powerful permanent magnet in contemporary magnets. Its BHmax value is 5-12 times that of an ferrite magnet and 3-10 times that of an aluminum nickel cobalt magnet; Its coercive force is equivalent to 5-10 times that of an ferrite magnet and 5-15 times that of an aluminum nickel cobalt magnet. Its potential magnetic properties are extremely high and it can absorb weights equivalent to 640 times its own weight.
Since the main raw material iron of the neodymium iron boron magnet is very cheap, the storage of rare earth helium is 10-16 times more than that of helium, so its price is also much lower than that of samarium cobalt magnet.
Neodymium iron boron magnets have better mechanical properties than samarium cobalt magnets and aluminum nickel cobalt magnets, and are easier to cut and drill and process complex shapes.
The deficiency of neodymium iron boron magnet is that its temperature performance is not good, and the magnetic loss is large and the maximum operating temperature is low under high temperature. It is generally about 80 degrees Celsius. In specially treated magnets, the maximum operating temperature can reach 200 degrees Celsius.
Because the material contains a large amount of neodymium and iron, it is also a major weakness. Therefore, neodymium iron boron magnets must be coated. Electroplating nickel(Ni), zinc(Zn), gold(Au), Chromium(Cr), epoxy(Epoxy) and so on.
Neodymium iron boron magnets are widely used in industrial aerospace, electronics, electromechanical, instrumentation, medical and other fields. And non-technical fields such as magnets, toys and jewelry are becoming more and more widely used