ANISOTROPIC RARE EARCH MAGNET POWDER, METHOD FOR PRODUCING THE SAME, AND BONDED MAGNET

文件类型：PDF文档
文件大小：831K
Anisotropic rare earth magnet powder particles include R2TM14B1-type crystals of a tetragonal compound consisting of one or more rare earth element, B, and one or more transition element, and enveloping layers containing at least Nd and Cu. Surfaces of the R2TM14B1-type crystals are enveloped by the enveloping layers. The particles has an average crystal grain diameter of 0.05 to 1 μm. The particles contain, when the whole particles are taken as 100 atomic %, 11.5 to 15 atomic % of total rare earth element (Rt); 5.5 to 8 atomic % of B; and about 0.05 atomic % to about 2 atomic % of Cu. The powder particles have an atomic ratio of Cu, which is a ratio of the total number of Cu atoms to a total number of atoms of Rt, falling within the range of 1 to 6%. The powder particles do not include dysprosium Dy, Tb, Ho and Ga. Coercivity of the magnetic powder is more than 955 kA/m.