Method For Preparing R-Fe-B Based Sintered Magnet

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The invention discloses a manufacturing method of an R-Fe-B sintered magnet. The manufacturing method of the R-Fe-B sintered magnet comprises the main steps of preparing a R1-Fe-B-M sintered magnet as a matrix; arranging an RLO particle layer of light rare earth element on the surface of the matrix and arranging a heavy rare earth RHX which comprises either dysprosium metal, or dysprosium hydride or both the dysprosium metal and the dysprosium hydride on the RLO particle layer; performing heating treatment inside a sintering furnace to enable the heavy rare earth RHX to evaporate to the surface of matrix by penetrating through the RLO particle layer and to diffuse from the surface to the inside of the magnet, wherein during the whole process, the RLO particle layer serves as transmission media and does not react with heavy rare earth elements. According to the manufacturing method of the R-Fe-B sintered magnet, the RLO particle layer of oxide and fluoride of light rare earth element is arranged between the magnet and the heavy rare earth RHX, so that on the one hand, non-direct contact of the magnet and the heavy rare earth RHX is achieved, on the other hand, the diffusion process of heavy rare earth RHX steam can be inhibited and slowed down, and excessive evaporation of the heavy rare earth RHX steam to the surface of the magnet can be prevented.