Title :
Magnetic properties of Sr-Zn system W-type hexagonal ferrite magnets prepared by new manufacturing method
Author :
Yamamoto, Hiroshi ; Nakajima, Takuya ; Yamada, Daisuke
Author_Institution :
Sch. of Sci. & Technol., Meiji Univ., Kawasaki, Japan
fDate :
9/1/1992 12:00:00 AM
Abstract :
Sr-Zn system W-type hexagonal ferrite magnets were prepared by a novel manufacturing method of SrO addition after semisintering treatment, and without atmosphere control. It was found that this process was very useful in stabilizing the W-type hexagonal structure. The optimum condition of making magnets and some properties of typical specimens are as follows: the chemical analysis composition is Sr2+ 1.248Zn2+ 2.655Fe2+ 0.625Fe3+ 14.981O27 the semisintering condition is 1275°C×0.5 h in air; and the magnetic and physical properties are Jm=0.350 T, Jr=0.323 T, HcJ=96.6 kA/m, H cB=94.4 kA/m, (BH)max=17.0 kJ/m3, TC=349°C, HA =988 kA/m, KA=1.72×105 J/m 3, and nB=34.5 μB
Keywords :
ferrimagnetic properties of substances; ferrites; permanent magnets; sintering; strontium; zinc; 1275 degC; SrZn2Fe16O27; W-type hexagonal ferrite magnets; chemical analysis composition; hexagonal structure; magnetic properties; manufacturing method; physical properties; semisintering treatment; Atmosphere; Chemical analysis; Control systems; Ferrites; Iron; Magnetic properties; Magnets; Manufacturing; Strontium; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
