Abstract
Nanocrystalline soft magnetic ribbons with high saturation magnetic flux density Bs and low coercivity Hc are attracted for high power devices. Ribbon-shaped samples with compositions of Fe83.3B16-xPxCu0.7 (x=4-10) were prepared. The activation energy of the crystallization reaction was estimated by Kissinger’s plot. The value of the Hc after the crystallization reaction was measured. As a result, it was found that as the amount of phosphorus increases, the activation energy of the crystallization reaction increases and the Hc decreases, but ΔTx become smaller. Finally, it turned out that silicon substitution is effective for stabilizing the Hc after heat treatment.
Highlights
Ribbon-shaped nanocrystalline soft magnetic alloys have been attracted to transformers and reactors due to its low coercivity and high permeability
FINEMET (Fe-Si-B-Nb-Cu)1 is well known as an industrialized nanocrystalline soft magnetic material
The amount of silicon substitution was small (1 at.%), it was found to have a large influence on the crystallization process and to contribute to lowering difficulty of the heat treatment process
Summary
Ribbon-shaped nanocrystalline soft magnetic alloys have been attracted to transformers and reactors due to its low coercivity and high permeability. FINEMET (Fe-Si-B-Nb-Cu) is well known as an industrialized nanocrystalline soft magnetic material. In the last ten years, many studies for increasing the Bs have been reported in a material system not containing niobium (Fe-Si-B-Cu, Fe-Si-P-Cu, Fe-P-C-Cu, Fe-SiB-P-Cu, Fe-Si-B-P-C-Cu10). These composition systems require much faster heating rate during crystallization in order to activate the crystal nucleation. This is a serious problem for industrialization of high Bs nanocrystalline materials. The effect of inhibiting grain growth by addition of phosphorous was investigated. The effect of enlarging the process window of the heat treatment process by silicon addition was investigated
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