Nd-Fe-B permanent magnets are tetragonal crystals formed by Nd (neodymium), Fe (iron) and B (boron). Known as "Magnetic King". According to the different preparation processes, Nd-Fe-B magnets are divided into three categories: sintering, bonding and hot pressing. Nd-Fe-B sintered magnets are anisotropic dense magnets manufactured by powder metallurgy; Nd-Fe-B bonded magnets are non-dense various types of magnets bonded with Nd-Fe-B microcrystalline powder and polymer. Isotropic magnets, Nd-Fe-B hot pressing magnets are anisotropic dense magnets manufactured by hot pressing and thermal deformation. Among them, Nd-Fe-B sintered magnets have the highest magnetic properties and the largest amount of use; Nd-Fe-B bonded magnets can be magnetized in any direction, and permanent magnets with complex shapes and high dimensional accuracy can be made by molding and injection molding; Fe-B hot-pressed magnets are used in the smallest amount. Currently, only Japan's Daido company is mass-producing them. The main application area is the EPS system of automobiles.

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