ナノ結晶Fe-Zr-Nb-B合金の軟磁気特性

概要

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The soft magnetic properties of nanocrystalline Fe-Zr-Nb-B alloys, which are mixtures of Fe-Zr-B alloy with negative magnetostriction and Fe-Nb-B alloy with positive magnetostriction, were investigated. The magnetostriction and grain size of the Fe-Zr-Nb-B alloys show values intermediate between those of Fe-Zr-B and Fe-Nb-B alloys. The soft magnetic properties are strongly affected by the Zr+Nb amount and Zr/Nb ratio. The best soft magnetic properties have been obtained for the Fe_<85. 5>Zr_2Nb_4B_<8. 5> alloy. This alloy simultaneously exhibits a high permeability of 60, 000 at 1 kHz, a high saturation magnetic flux density of 1. 64 T, and zero-magnetostriction. The alloy also exhibits a very low core loss of 0. 09 W/kg at 1. 4 T and 50 Hz, which is far lower than that of Fe-Si-B amorphous, as well as good thermal stability of the core loss. Nanocrystalline Fe-Zr-Nb-B alloy is therefore suitable as a core material for pole transformers.
2000-04-15