Title :
Effect of CaO and SiO2 additives on magnetic properties of SrZn2-W type hexagonal ferrite
Author :
Yamamoto, Hiroshi ; Mitsuoka, Takayuki
Author_Institution :
Sch. of Sci. & Technol., Meiji Univ., Kawasaki, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
An experiment was carried out to investigate the effect of CaO and SiO2 additives on the magnetic and physical properties of Sr-Zn W-type hexagonal ferrite. The specimens were prepared by the conventional manufacturing method without atmosphere control. It was found that the magnetic properties of SrO·2ZnO·8Fe2 O3 are considerably improved on adding 1 wt% CaO and SiO2 together. The optimum condition of making magnets with suitable properties are as follows: chemical analysis composition: Sr 0.8442+Zn2.2692+Fe2.269 2+Fe1.802+Fe14.844 3+Ca0.1612+Si0.1404+ O27; semisintering condition: 1275°C×1 h in air; sintering condition: 1225°C×0.5 h in air. The magnetic properties are Jm=0.438 T, Jr=0.402 T, Hc J=92.4 kA/m, HcB=88.8 kA/m, (BH)max=20.3 kJ/m3, Tc=393°C, HA=968 kA/m, KA=2.11×105 J/m3, and nB =32.8 μB
Keywords :
calcium compounds; ferrites; permanent magnets; silicon compounds; sintering; strontium compounds; zinc compounds; 1225 C; 1275 C; CaO additives; SiO2 additives; SrO-ZnO-Fe2O3-CaO-SiO2; SrZn2-W type hexagonal ferrite; chemical analysis composition; magnetic properties; magnets; manufacturing; physical properties; semisintering; sintering; Additives; Atmosphere; Chemical analysis; Ferrites; Iron; Magnetic properties; Magnets; Manufacturing; Strontium; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
