Abstract
A powder of Fe83.3Si4B8P4Cu0.7 composition with D50 of 4.2 μm was prepared by the modified water atomization system named “HPWA/YK”. The obtained powder had a mostly amorphous single phase. The powder was classified to several particle sizes and the difference of enthalpy between the as-quenched state and an after-primary-crystallization state was measured by DSC. As a result, it was found that the HPWA/YK system has better cooling capability than the conventional water atomizing method and the spinning water atomizing method. In conclusion, we consider that the HPWA/YK system contributes to mass production of nanocrystalline soft magnetic powders with high saturation magnetic flux density which require enormously rapid quenching.
Highlights
Soft magnetic composite core are widely used for inductors and choke coils operating at high frequency (100 kHz-MHz representatively).1,2 Fe-Si(-Cr) powder is industrially mainstream product because it is relatively inexpensive and easy to compress molding to high density.3 Recently, the production of Fe-based amorphous materials is increasing due to the high demand for low core loss
The most highest ∆E1 value was detected in the powder with D50 of 4.2 μm produced by the HPWA/YK system
This results indicate that the cooling capability of the HPWA/YK system is remarkably higher than that of the conventional water atomization over the range of scitation.org/journal/adv value of the Bs
Summary
Soft magnetic composite core are widely used for inductors and choke coils operating at high frequency (100 kHz-MHz representatively). Fe-Si(-Cr) powder is industrially mainstream product because it is relatively inexpensive and easy to compress molding to high density. Recently, the production of Fe-based amorphous materials is increasing due to the high demand for low core loss. It is strongly expected that the intrinsic permeability and the saturation magnetic flux density (Bs) are improved and the magnetostriction is reduced.. It is strongly expected that the intrinsic permeability and the saturation magnetic flux density (Bs) are improved and the magnetostriction is reduced.4 To solve those problems, many studies on Fe-based nanocrystalline powder are progressing. Since the cooling rate of the planar flow casting method is fast (-106 K/s), it is suitable for manufacturing a high-Bs nanocrystalline material which shows low amorphous forming ability.. For the purpose of high density molding, a nearly spherical shaped powder made by an atomizing method is more preferable.. The cooling rate of conventional atomizing methods is not enough to obtain a high-Bs nanocrystalline material such as NANOMET®.7. Since the cooling rate of the planar flow casting method is fast (-106 K/s), it is suitable for manufacturing a high-Bs nanocrystalline material which shows low amorphous forming ability. For the purpose of high density molding, a nearly spherical shaped powder made by an atomizing method is more preferable. the cooling rate of conventional atomizing methods is not enough to obtain a high-Bs nanocrystalline material such as NANOMET®.7 we attempted to improve the cooling rate of the water atomization method
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