US Patent 11978576 Method for preparing sintered magnet and sintered magnet

A method for preparing a sintered magnet is provided according to one embodiment of the present disclosure. The method includes preparing a mixed powder by coating fluorides on a surface of magnetic powder, adding heavy rare earth hydrides to the mixed powder, and heating the mixed powder, wherein the magnetic powder includes rare earth element-iron-boron-based powder, and the fluorides include at least one of an organic fluoride or an inorganic fluoride.