The invention discloses a sintered
neodymium-
cerium-iron-
boron magnet with high comprehensive magnetic performance, which is prepared by uniformly mixing and pressing
alloy powder with a
chemical formula of (Nd1-xCex) aM100-a-b-cFebBc and one or more kinds of X-B
alloy powder and carrying out
sintering and
tempering treatment, a is more than or equal to 28 and less than or equal to 33, b is more than or equal to 58 and less than or equal to 69, c is more than or equal to 0.8 and less than or equal to 1.1, x is more than 0 and less than or equal to 20, and b is more than or equal to 1 and less than or equal to 3. M is one or more of Zn, Ga, Co, Cu, Nb, Si, Mn and Al, and X is one or more of Ti, Hf, Zr, Cr and Mo. The preparation method comprises the steps of
raw material proportioning, rapid hardening melt-
spinning,
hydrogen crushing,
airflow grinding powder preparation, mixed powder compression,
sintering and
tempering heat treatment. The X-B compound is introduced, a multi-stage
induction system is constructed in the
magnet, directional migration and enrichment of Ce elements in a
grain boundary area are effectively regulated and controlled, an excellent magnetic
microstructure with a Ce-rich
grain boundary phase and a main phase mainly comprising Nd2Fe14B is formed, a
grain boundary engineering strategy without additional heavy
rare earth element compensation is provided, and the preparation method has the advantages of being simple in process, low in cost and easy to popularize. And efficient utilization of high-abundance
rare earth resources and comprehensive improvement of performance are achieved, and good technical advancement and industrial application prospects are achieved.