R2(Fe1-xAlx)14B的内禀磁性和永磁性能(R=Nd和Y)

本文研究了Al在R₂(Fe_1-xAl_x)₁₄B多元合金中的固溶度(R=Nd和Y),当x<0.1时,可形成四方结构。研究了在此类合金中,饱和磁化强度、居里温度、磁晶各向异性等内禀磁性,以及矫顽力和磁能积等永磁性能随Al含量的变化。发现以Al代换Fe时,使铁次点阵的磁晶各向异性出现极值;同时以Al代换Fe时,可使磁体的矫顽力显著提高。以Co和Al同时对Fe进行代换,制造成分约为Nd_16.5B _关键词：

INTRINSIC AND PERMANENT MAGNETIC PROPERTIES OF R2(Fe1-xAlx)14B (R=Nd AND Y)

The solubility range of Al in R₂(Fe_1-xAl_x)₁₄B, R=Nd and Y, have been determined. They crystallize in the tetragonal structure when x<0.1. The intrinsic magnetic properties such as saturation magnetization, Curie temperature and magnetocrystalline ani-sotropy as well as permanent magnet properties, e.g., coercive force and energy product, have been investigated with the Al content, x varying. We find that a maximum appears in anisotropy of Fe sublattice when the Fe atoms are replaced partly by Al atoms, and, the substitution of Fe with Al is effective to enhance the coercivity. The experimental data indicate the substitution of Fe by Co and Al results in an increasing both Curie temperature and coercive force. Accordingly it is available to improve the thermal property and reduce the total loss of the magnets based on Nd₂Fe₁₄B by substituting properly Fe with Co and Al.