Rare earth magnets for applications over a wide temperature range

Autor:	Minoru Endoh, S. G. Sankar, M. Hasegawa, Kimio Uchida, Masaaki Tokunaga, Yasuto Nozawa, Shigeho Tanigawa
Rok vydání:	1993
Předmět:	Neodymium magnet Materials science Condensed matter physics Magnet Demagnetizing field Rare earth Thermal stability Permeance Coercivity Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials
Zdroj:	Journal of Magnetism and Magnetic Materials. 124:325-329
ISSN:	0304-8853
DOI:	10.1016/0304-8853(93)90134-n
Popis:	Sm2Co17-type sintered magnets and Nd-Fe-B die-upset magnets have been investigated over the temperature range 4.2–423 K. Their magnetic properties were compared with those of SmCo5 and Nd-Fe-B sintered magnets. This study indicates that the Sm2Co17-type magnets appear to be the best for applications at high temperatures up to 423 K. The magnetic properties of a Sm2Co17 magnet at 423 K are: Br = 10.8 kG, iHc = 15.7 kOe and (BH)max = 27.1 MGOe. The irreversible loss of the Sm2Co17 magnet at a permeance coefficient of 2 is 1.1% after exposure at 573 K for half an hour. Sintered Nd-Fe-B magnets exhibit better thermal stability compared to their die-upset conterparts. The second quadrant loop of the Nd-Fe-B magnets exhibit an anomalies behavior at 4.2 K due to the spin reorientation phenomenon which occurs at 140 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8bd36a8f809508003a50de2fb7b8c1df https://doi.org/10.1016/0304-8853(93)90134-n Zobrazit plný text záznamu