Title :
Hot Pressed Pr2(Fe,Co)14B/PrCo5 Hybrid Magnet Prepared by Spark Plasma Sintering
Author :
Zhang, D.T. ; Yue, M. ; Wang, C.G. ; Lu, Q.M. ; Liu, W.Q. ; Zhang, J.X. ; Sundararajan, J. ; Qiang, Y.
Author_Institution :
Coll. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing, China
Abstract :
PrFeB/PrCo5 hybrid magnets were prepared by spark plasma sintering from the commercial nanograin Pr2(Fe,Co)14B powders (80wt.) and as-milled amorphous PrCo5 powders (20wt.). X-ray diffraction of the isotropic Pr2(Fe,Co)14B/PrCo5 hybrid magnet shows the existence of the major Pr2(Fe,Co)14B phase and the minor PrCo5 phase. A small amount of a new Pr(Co1-xFex)3 phase was also detected. Both coercivity and remanence values of the hybrid magnet lie between those of Pr2(Fe,Co)14B and PrCo5 magnets. The smooth demagnetization curve of the hybrid magnet shows that the hybrid magnet retains the characteristics of a single, hard ferromagnet. The 720K Curie temperature indicates strong exchange coupling between the Pr2(Fe,Co)14B and PrCo5 phases. The new Pr(Co1-xFex)3 phase, due to interdiffusion between Pr2(Fe,Co)14B and PrCo5 phases, does not affect the performance of the hybrid magnet.
Keywords :
Curie temperature; X-ray diffraction; boron alloys; chemical interdiffusion; cobalt alloys; coercive force; composite materials; demagnetisation; exchange interactions (electron); ferromagnetic materials; hot pressing; iron alloys; permanent magnets; plasma materials processing; praseodymium alloys; remanence; sintering; Curie temperature; Pr2(FeCo)14B-PrCo5; X-ray diffraction; XRD; coercivity; exchange coupling; hot pressed hybrid magnet; interdiffusion; isotropic hybrid magnet; milled amorphous powders; nanograin powders; remanence; single hard ferromagnet; smooth demagnetization curve; spark plasma sintering; Amorphous magnetic materials; Magnetic properties; Perpendicular magnetic anisotropy; Plasma temperature; Powders; Temperature; Hard magnetic materials; Hybrid magnet; Interdiffusion; PrFeB/PrCo5; Spark plasma sintering; hybrid magnet; interdiffusion; interphase; spark plasma sintering;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2015.2405491
