Sintered NdFeB magnets, i.e. sintered neodymium iron boron magnets, are those permanent magnetic materials that based on a Nd-Fe-B tetragonal crystal structure, and they are manufactured through a powder metallurgy (PM) process. They contain three basic m, iron and boron. The neodymium bstituted by a portion of other rare earth ncluding praseodymium (Pr), dysprosium (Dy), terbium (Tb), cerium (Ce), etc. The iron bstituted by a portion of cobalt (Co) se 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 a small portion of other metal g aluminium (Al), copper (Cu), niobium (Nb), gallium (Ga), etc.
Due to their outstanding magnetic properties (high remanence Br: 1.1-1.5 T, middle high coercivity Hcj: 800-3000 kA/m3 and high maximum energy product (BH)max: 220-430 kJ/m3) together with competitive cost, sintered NdFeB magnets are widely applied in direct current (DC) motors, servo motors, stepper/stepping motors, synchronous motors, tors, voice coil motors (VCMs), wind turbines and generators, magnetic resonance imaging (MRI), electric power steering (EPS), magnetic separation, etc.
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