ガラスセラミック法で作成したSrFe12O19粒子のプラスチック磁石への応用

概要

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High coercivity SrFe12O19 particles were prepared by the glass-ceramic method using the glass with composition y=1 in the system 46.94[(1-y)BaO⋅ySrO]⋅7.14B2O3⋅11.43SiO2.24.49Fe2O3 (mo1%), and plastic-magnets were fabricated with the obtained particles. SrFe12O19 particles (≈0.3μm in diam.) were obtained by leaching the sample after a heat treatment of the glass (y=1) at 875°C for 5 hr. The particles showed very high coercive force of 6080 Oe and σs=52 emu/g. SrFe12O19 plastic-magnet fabricated by the roll method consisted of random assembly. Values of magnetic properties were BHC=1030 Oe, Br=1150G, and (B⋅H)max=0.3 M G⋅Oe, however a SrFe12O19 plastic-magnet fabricated by the injection molding under applying magnetic field exhibited slightly preferred orientation with the values of BHC=1551 Oe, Br=1743 G, and (B⋅H)max=0.7 M G⋅Oe.
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