The main raw materials of NdFeB permanent magnets are rare earth metal neodymium (Nd) 32%, metal element iron (Fe) 64% and nonmetal element boron (B) 1% (a small amount of dysprosium (Dy), terbium (Tb), cobalt (Co), niobium (Nb), gallium (Ga), aluminum (Al), copper (Cu) and ot...