Abstract：Since the invention in the 1980s, Nd-Fe-B magnets have been widely used in high-tech fields such as new energy vehicles, medical instruments and wind power generation due to their excellent magnetic properties. The Nd-Fe-B magnets are one kind of rare earth permanent magnet materials with the fastest development, most widely application and the largest market potential. In this paper, the hot deformed Nd-Fe-B magnets doped with different contents of La-Ce-Cu alloy were prepared by the Spark Plasma Sintering (SPS) technique. The effects of doping amount on magnetic properties and microstructure of the magnets were investigated. The results show that the coercivity of hot deformed Nd-Fe-B magnet increases first and then decreases with the increase of doping amount reaching a maximum value of 15.8 kOe at a doping amount of 1 wt.%, while the remanence and magnetic energy product decrease slightly with the doping of La-Ce-Cu alloys. Microscopic analysis shows that the doped La element tends to be distributed in the rare earth-rich phase and does not enter the main phase grains; while the Ce element easily replaces Nd into the main phase grains.
2019, Vol. 26 