Study on Magnetic Properties of Nd/MM-Fe-B Composite Hot-Pressed and Hot-Deformed Magnets Prepared by SPS Technology AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]

Citation Information:

In order to achieve efficient and balanced utilization of rare earth resources,this study used mis-chmetal(MM)rich in La and Ce as the main raw material.Nd/MM-Fe-B composite hot-pressed and hot-deformed magnets were fabricated by the dual main-phase process combined with spark plasma sintering(SPS)technology.The evolution of magnetic properties,microstructure and coercivity mechanism of mag-nets with different mischmetal contents was systematically investigated.The results show that when the ratio of mischmetal to total rare earth increases from 0 to 30.61%,the remanence of the magnet decreases from 13.38 kGs to 11.96 kGs,while the coercivity decreases from 12.79 kOe to 11.01 kOe.With increa-sing mischmetal content,the rare-earth-rich phase is squeezed out of grain boundaries at high temperature and high pressure,leading to an increased proportion of equiaxed coarse-grained regions and ultimately reducing the remanence and coercivity of the hot-pressed and hot-deformed magnets.The intergranular ex-change coupling of the magnets gradually weakens,the long-range magnetostatic interaction strengthens,the irreversible susceptibility decreases,the consistency of magnetization reversal deteriorates,the pinning effect weakens,and thus the coercivity degrades.