Sr-Zn系W型フェライト粉末の磁気特性とそれらのボンド磁石のトルクリミッタへの応用(ハード磁性材料)

概要

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An experiment was carried out to examine the application of an Sr-Zn-W-type hexagonal ferrite bonded magnet as a hysteresis bonded magnet in a non-contact-type torque limiter using a magnet. The magnetic properties of Sr-Zn-W-type hexagonal powders ware first examined in order to prepare a bonded magnet. The preparation conditions for a typical sample were as follows: chemical analysis composition, Sr^<2+>_<0.93>Zn^<2+>_<0.93> Fe^<2+>_<1.02>Fe^<3+>_<16.07>O_<27>; reaction sintering condition, 1300℃×4.0 h in air; average particle size after pulverizing, 0.85μm. The magnetic properties of Sr-Zn-W-type hexagonal ferrite powders are σ_s=95.5×10^<-6> Wb・m/kg, H_<cJ>=60.5 kA/m. Next, an injection molding bonded as a hysteresis bonded magnet was prepared by using these powders and Sr-M-type ferrite powders. Non-contact-type torque limiters were made experimentally by using these bonded magnets. The torque value of a torque limiter prepared from an Sr-Zn-W-type ferrite bonded magnet was found to be better than that of a torque limiter prepared from an Sr-M-type ferrite bonded magnet, and the leakage magnetic flux decreased by 13%.
社団法人日本磁気学会の論文
2006-03-01