METHOD FOR PREPARING RARE EARTH ALLOY SPHERICAL SINGLE CRYSTAL MAGNETIC POWDER, AND RARE EARTH GIANT MAGNETOSTRICTIVE MATERIAL HAVING ORIENTATION

摘要

The present invention provides a rare earth giant magnetostrictive material having orientation and a method for preparing an alloy spherical single crystal magnetic powder. The method comprises the following steps: 1) preparing an R-Fe-M alloy spherical magnetic powder; 2) uniformly mixing the R-Fe-M alloy spherical magnetic powder with an inert solid dispersing agent, and annealing same at a temperature below the melting point of an R-Fe-M alloy, so as to obtain an R-Fe-M cubic Laves phase single crystal particle; and 3) removing the solid dispersing agent, so as to obtain an R-Fe-M cubic Laves phase spherical single crystal magnetic powder. In the present invention, the R-Fe-M alloy spherical magnetic powder is separated from the inert solid dispersing agent, and the spherical single crystal particle is prepared by means of the abnormal growth capability of an R-Fe-M cubic Laves phase crystal particle at the high temperature. The bonded rare earth giant magnetostrictive material having high degree of orientation and the sintered rare earth giant magnetostrictive material are prepared.