The demand for soft magnetic amorphous metal powders with high saturation magnetization values and low energy loss has increased to achieve high-performance inductors for mobile electronic devices. In this study, Fe-based Fe_92.3Si_3.5B_3.0C_0.7P_0.5 (wt.%) amorphous metal powders were prepared using different atomization methods for controlling the surface oxidation of the metal alloy powder. Conventional high-pressure water atomization and the newly developed high-speed water screen atomization methods were used for preparation. Regardless of the preparation methods, both alloy powders were amorphous, and their magnetic flux density (Bs) values were more than 165 emu/g. Compared to the powders from the conventional high-pressure water atomization method, the amorphous metal powder manufactured using the high-speed water screen atomization process had lower eddy current loss because of the formation of a thin and uniform oxide layer. Furthermore, the magnetic properties of the consolidated magnetic cores fabricated with the amorphous powders produced by the high-speed water screen atomization method using compact-pressing techniques were characterized. Magnetic powders with fewer surface oxidation layers exhibited increased initial permeability and a smaller coercive field, leading to a lower core loss value. The magnetic core made from Fe_92.3Si_3.5B_3.0C_0.7P_0.5 (wt.%) amorphous powder with an oxide content of 0.12 (wt.%) using the high-speed water screen atomization method exhibited an initial permeability of 25 in the frequency range up to 5 MHz, and a loss of 237 mW/cm³ with B_m = \(0.2\,{\text{T}}\) at 1 MHz.

Graphical Abstract

中文翻译：

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表面氧化对雾化法制备铁基非晶金属粉末磁性能的影响

为了实现移动电子设备的高性能电感器，对具有高饱和磁化强度值和低能量损耗的软磁非晶金属粉末的需求不断增加。本研究采用不同雾化方法制备铁基Fe _92.3 Si _3.5 B _3.0 C _0.7 P _{0.5 (wt.%)非晶金属粉末，以控制金属合金粉末的表面氧化。}采用常规高压水雾化和新开发的高速水幕雾化方法进行制备。无论采用何种制备方法，两种合金粉末均为非晶态，其磁通密度（Bs) 值大于 165 emu/g。与传统高压水雾化方法制备的粉末相比，采用高速水幕雾化工艺制造的非晶金属粉末由于形成了薄且均匀的氧化层，因此涡流损耗更低。此外，还对采用高速水幕雾化法和压制技术制备的非晶粉末制成的固结磁芯的磁性能进行了表征。表面氧化层较少的磁粉表现出较高的初始磁导率和较小的矫顽磁场，从而导致较低的磁芯损耗值。磁芯材质为 Fe _92.3 Si _3.5 B _3.0 C _0.7 P采用高速水网雾化法制备的氧化物含量为0.12（wt.%）的0.5（wt.%）非晶粉末在高达5 MHz的频率范围内表现出初始磁导率为25，损耗为237 mW _/ cm ³，其中B _m = \(0.2\,{\text{T}}\)在 1 MHz 时。

图形概要