Method For Preparing R-Fe-B Based Sintered Magnet

The present invention discloses a method for manufacturing an R-Fe-B sintered magnetic body. A main step which the present invention involves is to prepare an R-Fe-B sintered magnet as a main material and then place an RXE layer on the main material surface. RXE is composed of a powder RX containing a heavy rare earth element, an organic solid powder EP, and an organic solvent ET. After drying, an organic thin film layer covering the heavy rare earth element is formed on the surface of the main material. During a heating process, the organic materials EP and ET in the RXE layer escape from the main material in the heating process, and the heavy rare earth element in RX diffuses into the magnetic body to enhance magnetic body performance. An advantage of the present invention is which thickness of the RXE layer is uniform and does not easily peel off, and the organic material containing EP and ET does not significantly increase a basic carbon element content even if the main material is removed during the heating process.COPYRIGHT KIPO 2018