Title :
Abnormal Coercivity Enhancement in Hybrid Nanograin Pr2(Fe, Co)14B/Pr(Co,Fe)5 Magnets
Author :
Shen, Y. ; He, Y. ; Huang, M. ; Lee, D. ; Bauser, S. ; Higgings, A. ; Chen, C. ; Liu, S.
Author_Institution :
FutureTek USA Corp., Dayton
Abstract :
The thermomagnetic analysis of a hybrid Pr2(Fe,Co)14B/Pr(Co,Fe)5 magnet has revealed that two major events take place at 505degC and 975degC. Most likely, the 505degC event is the Curie temperature of a main phase, while the 975degC event is the Curie temperature of a minor phase. In addition, a few minor events were detected at 313, 772, and 872degC, indicating that hybrid magnets may have complex phase structures. Unfortunately, experiment showed that the partial substituting Fe for Co in PrCo5 sharply decreases the intrinsic coercivity of PrCo5, leading to very poor energy product a PrCo5 magnet.
Keywords :
Curie temperature; boron alloys; cobalt alloys; coercive force; iron alloys; nanostructured materials; praseodymium alloys; thermomagnetic effects; Curie temperature; Pr2Co14B-PrFe5; Pr2Fe14B-PrCo5; coercivity; complex phase structures; hybrid nanograin magnets; temperature 313 C; temperature 505 C; temperature 772 C; temperature 872 C; temperature 975 C; thermomagnetic analysis; Amorphous materials; Anisotropic magnetoresistance; Coercive force; Iron; Magnetic analysis; Magnets; Powders; Saturation magnetization; Temperature; Thermal stability;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.374944
