Title :
Bulk fully dense nanocomposite (Nd,Pr,Dy)/sub 2/Fe/sub 14/B/Fe magnets
Author :
Sam Liu ; Hilton, S. ; Yong Zhang ; Hadjipanayis, G. ; Christina Chen ; Don Lee
Author_Institution :
Magnetics Lab., Dayton Univ., OH, USA
fDate :
March 30 2003-April 3 2003
Abstract :
In this paper, cylinders with diameter of /spl sim/0.5" (11-15 mm) were made. Full densities of the hot pressed nanocomposite magnets were achieved even when hot pressed at a low temperature of 700/spl deg/C. The highest density obtained was 7.68 g/cm/sup 3/ for a Nd/sub 2.4/Pr/sub 5.6/Dy/sub 1/Fe/sub 85/B/sub 6/ magnet hot pressed at 700/spl deg/C with a pressure of 25 kpsi. The coercivity of the hot-pressed magnets was ranging from 0.5 kOe to 6 kOe, depending on the hotness temperature. the highest maximum energy product obtained is 10 MGOe. Comparing with the magnetic properties of the ribbons, the hot pressed magnets demonstrate a relatively low remanence. After the hot press, the density and magnetic properties were characterized and microstructures were observed by transmission electron microscopy (TEM).
Keywords :
boron alloys; cobalt alloys; coercive force; crystal microstructure; dysprosium alloys; ferromagnetic materials; hot pressing; iron alloys; nanocomposites; neodymium alloys; permanent magnets; praseodymium alloys; remanence; transmission electron microscopy; 25000 psi; 700 degC; NdPrDyFeB; NdPrDyFeCoB; TEM; crystal microstructure; density; hot pressed nanocomposite magnets; hot pressing; hotness temperature; magnetic properties; remanence; transmission electron microscopy; Coercive force; Electrons; Iron; Magnetic properties; Magnets; Microstructure; Neodymium; Remanence; Temperature dependence; Temperature distribution;
Conference_Titel :
Magnetics Conference, 2003. INTERMAG 2003. IEEE International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7647-1
DOI :
10.1109/INTMAG.2003.1230552
