Abstract
The magnetic properties and phase composition of magnets based on misch-metal (MM) with nominal composition of MM13+xFe84−xB6.5 with x=0.5, 1, 1.5, 2 and 2.5 using melt-spinning method were investigated. For x=1.5, it could exhibit best magnetic properties (Hcj=753.02kAm−1, (BH)max=70.77kJm−3). X-ray diffraction and energy dispersive spectroscopy show that the multi hard magnetic phase of RE2Fe14B (RE=La, Ce, Pr, Nd) existed in the magnets. The domain wall pinning effect and the exchange coupling interaction between grains are dependent on the abnormal RE-rich phase composition. Optimizing the phase constitution is necessary to improve magnetic properties in MM-Fe-B magnets for utilizing the rare earth resource in a balanced manner.
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