DocumentCode
789316
Title
Nanostructured melt-spun Sm(Co,Fe,Zr,B)7.5 alloys for high-temperature magnets
Author
Makridis, Sofoklis S. ; Litsardakis, George ; Efthimiadis, Kostas G. ; Papathanasiou, George ; Panagiotopoulos, Ioannis ; Hofinger, Sabine ; Fidler, Josef ; Hadjipanayis, George C. ; Niarchos, Dimitris
Author_Institution
Dept. of Electr. & Comput. Eng., Aristotle Univ., Thessaloniki, Greece
Volume
39
Issue
5
fYear
2003
Firstpage
2869
Lastpage
2871
Abstract
High coercivity, the highest for Cu-free 2 : 17 Sm-Co ribbons, has been obtained in as-spun (Hc=21.1 kOe) and short time annealed (Hc=23.2 kOe) samples of Sm(CobalFezZryBx)7.5 alloys, with varying B, Zr, and Fe content (x = 0-0.06, y=0-0.16, z = 0.08-0.3) and wheel speed. In as-spun samples, the TbCu7 type structure and in annealed samples the Th2Zn17 and CaCu5 type structures is observed, plus fcc Co as minority phase is observed. Reduced remanence (Mr/Ms) is higher than 0.7. High-temperature magnetic measurements show very good stability above 300°C with coercive field as high as 5.2 kOe at 330°C. For annealed Sm(CobalFe0.3Zr0.02B0.04)7.5, very good loop squareness and high maximum energy product of 10.7 MGOe have been obtained. Increasing Zr content results in less uniform microstructure of annealed ribbons.
Keywords
boron alloys; cobalt alloys; coercive force; crystal microstructure; ferromagnetic materials; ferromagnetic-antiferromagnetic transitions; iron alloys; magnetic annealing; magnetic hysteresis; melt spinning; nanostructured materials; permanent magnets; remanence; samarium alloys; zirconium alloys; 300 degC; 330 degC; Sm(CoFeZrB)7.5; coercive field; coercivity; high maximum energy product; high-temperature magnets; microstructure; nanostructured melt-spun Sm(Co,Fe,Zr,B)7.5 alloys; remanence; short time annealed; very good loop squareness; very good stability; wheel speed; Annealing; Coercive force; Iron alloys; Magnetic variables measurement; Microstructure; Remanence; Stability; Wheels; Zinc; Zirconium;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2003.815731
Filename
1233243
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