Effect of Si Substitution on Structure and Magnetic Properties in Mischmetal-Fe-B Ribbons

摘要

(LaCe)FeSiB (, 0.5, 1.0, 1.5, 2.0) ribbons were prepared by the melt-spinning technique, and La–Ce mischmetal with impurities was used as the starting material. The effects of Si substitution on phase formation and room temperature magnetic properties were investigated by X-ray diffraction and a vibrating sample magnetometer. It was found that the optimal wheel velocity dropped dramatically when a small amount of Si was introduced. It dropped from 20 to 15 m/s while Si concentration increased from to 0.5. We also found that increasing the Si content can damage the phase formation of the 2:14:1 structure, which is different from the case in NdFeB and even in CeFeB. The substitution of Si for Fe does not enhance the coercivity of (LaCe)FeB magnets effectively. The result indicates that the early findings about the element substitution and addition in NdFeB cannot be simply copied in research studies of (LaCe)FeB.