Title :
Magnetic properties of Sm2(Fe1-xCox)17Ny compounds and their bonded magnets
Author :
Yamamoto, Hiroshi ; Iwasawa, Junichi ; Kumanbara, Takashi ; Kojima, Takashi
Author_Institution :
Sch. of Sci. & Technol., Meiji Univ., Kawasaki, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
Sm2(Fe1-xCox)17Ny compounds (X=0 to 1) are prepared by nitrogenation of Sm 2(Fe1-xCox)17 alloy powders (about 30 μm) in high-purity nitrogen gas at a pressure of 4.9 MPa, at 550°C for 1 to 5 h. HA and σs of these samples are measured with magnetically aligned powders. It is found that HA and σs values of Sm2(Fe0.8Co0.2)17N3.03 compound are 12.83 MA/m and 191.0×10-6 Wb-m/kg. Epoxy and zinc-bonded magnets were prepared from Sm2(Fe0.8Co0.2)17N3.03 compound powder by a compression molding process. Zn-bonded magnets are heated at 425-475°C for 4 h in an Ar atmosphere. The magnetic properties of an anisotropic compressed epoxy-bonded magnet are (BH)max=124.8 kJ/m3, Jr=0.963 T and H cJ=488 kA/m, and the (BH)max of zinc-bonded magnet is 68.4 kJ/m3
Keywords :
cobalt alloys; ferromagnetic properties of substances; iron alloys; magnetic properties of fine particles; nitridation; permanent magnets; powder metallurgy; samarium alloys; 1 to 5 hours; 4.9 MPa; 425 to 475 degC; 550 degC; Sm2(Fe0.8Co0.2)17N 3.03; Sm2(Fe1-xCox)17N y; Zn bonded magnet; alloy powders; bonded magnets; compression molding process; epoxy bonded magnets; magnetic properties; magnetically aligned powders; nitrogenation; Cobalt alloys; Compression molding; Iron alloys; Magnetic anisotropy; Magnetic properties; Magnets; Nitrogen; Perpendicular magnetic anisotropy; Powders; Samarium alloys;
Journal_Title :
Magnetics, IEEE Transactions on
