鐵矽鉻合金粉末製作之磁性元件由於具有高導磁係數、高飽和磁化量及相當優異之直流疊加特性，因此目前已廣泛應用於大電流功率電感器上。本研究以單軸加壓成型的方式製作鐵矽鉻合金胚體，再以不同熱處理溫度進行退火處理，使鐵矽鉻合金粉末之晶粒外圍形成一氧化層以降低磁損失。但過量的氧化層亦會使磁性質下降，因此期望透過添加不同量的硝酸釔來控制鐵矽鉻合金粉末表面氧化層的形成。
本研究建立成型壓力、硝酸釔添加量、熱處理溫度與胚體密度、應變能、氧化層厚度及電磁性質間之關係。結果顯示隨著成型壓力由500MPa增大至800MPa，相對密度逐漸提高，使得飽和磁化量增高，進而使初導磁係數亦由30提高到40。而經過退火熱處理之後，使得胚體內部之應變能降低，初導磁係數大幅上升。在熱處理溫度方面，隨著溫度的上升，胚體的電阻值也有所提升。胚體的直流疊加特性隨著熱處理溫度上升亦有所提升。添加0.02wt%硝酸釔可改善鐵矽鉻合金粉末磁性元件之品質因子。

The magnetic components made using Fe-Si-Cr alloy have been widely used in high-current power inductors due to its high initial permeability, high saturation magnetization and the excellent DC bias characteristics. In this study, Fe-Si-Cr alloy bodies were prepared by using a uniaxial press molding and then annealed at different heat treatment temperatures to form a chromium-rich oxide layer to reduce the magnetic losses. However, too thick oxide layer formed on the Fe-Si-Cr alloy powder will lead to the degradation of initial permeability. Therefore, adding different amounts of yttrium nitrate into Fe-Si-Cr alloy powder was used to control the oxide layer formation. In this study, the relationships between the molding pressure, the amount of yttrium nitrate addition, heat treatment temperature, density, oxide layer thickness and electromagnetic properties were investigated. The results showed that the relative density gradually increased with increasing molding pressure, which led to the saturation magnetization increased, thereby enabling to improve the initial permeability from 30 to 39. After annealing, the internal strain was reduced, which resulted in the initial permeability increasing substantially. Moreover, the electric resistivity and DC superposition characteristics also increased with increasing heat treatment temperature. The initial permeability can be maintained at about 40, but the magnetic loss can be reduced by adding 0.02wt% yttrium nitrate.

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