Sintered NdFeB Magnets

Sintered NdFeB magnets, i.e. sintered neodymium iron boron magnets, are those permanent magnetic materials based on a Nd-Fe-B tetragonal crystal structure. Sintered NdFeB magnets were invented by M. Sagawa’s team in the early 1980s, they are manufactured through a powder metallurgy process.

Sintered NdFeB magnets contain three basic elements neodymium, iron and boron. The neodymium element can be substituted by a portion of other rare earth elements including praseodymium, dysprosium, terbium, cerium, etc. The iron element can be substituted by a portion of cobalt element to increase the magnets’ Curie temperature Tc, thermal stability and corrosion resistance. In order to control the microstructure and the microchemistry so as to meet required performance, it also adds some doping elements including aluminium, copper, niobium, gallium, etc. For custom NdFeB magnets sintered, controlling the formula is the basic method to obtain required magnet grades.

Due to their outstanding magnetic properties (high remanence Br 1.1-1.5 T, middle high coercivity Hcj 800-3000 kA/m^3 and high maximum energy product (BH)max 220-430 kJ/m^3) together with competitive cost, sintered NdFeB magnets are widely applied in DC motors, servo motors, stepper/stepping motors, synchronous motors, linear motors, voice coil motors (VCMs), wind turbines and generators, magnetic resonance imaging (MRI), electric power steering (EPS), magnetic separation, etc.

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