DocumentCode :
959277
Title :
Low temperature coefficient cobalt-rare earth magnets
Author :
Jones, F.G. ; Tokunaga, M.
Author_Institution :
Hitachi Magnetics Corp., Edmore, MI
Volume :
12
Issue :
6
fYear :
1976
fDate :
11/1/1976 12:00:00 AM
Firstpage :
968
Lastpage :
970
Abstract :
Co-Gd-Sm alloys were made by calcium co-reduction of mixtures of Gd2 O3 and Sm2 O3 in the presence of cobalt powder. Both the base alloy (Co5 Gd0.4 Sm0.6 ) and the sintering additive (Co7 Gd0.8 Sm1.2 ) were made by this lower cost R/D process. Die-pressed magnets with a reversible temperature coefficient of magnetization of -0.004 %/°C and an energy product of 9.9 MGOe were made. These magnets performed well in a TWT stack. Co-Ho and Co-Er alloys were also made by the calcium reduction of their oxides. And, one Co-Ho-Sm magnet made from ingot material had a 
MGOe and a reversible coefficient equal to zero near room temperature.
MGOe and a reversible coefficient equal to zero near room temperature.Keywords :
Magnetic thermal factors; Permanent magnet materials; Additives; Calcium; Cobalt alloys; Costs; Earth; Magnetic materials; Magnets; Powders; Samarium alloys; Temperature;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1976.1059139
Filename :
1059139
Link To Document :
