Li Guanzhi, Shi Guibing, Miao Hongyi, Liu Dan, Li Zongzhen, Wang Mingxu, Wang Li
School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai 264209, China.
Weihai Wanfeng Magnesium Industry Science and Technology Development Co., Ltd., Weihai 263200, China.
Materials (Basel). 2023 Feb 2;16(3):1284. doi: 10.3390/ma16031284.
FeSiBCuNb powders prepared by the gas atomization method generally exhibit a wide particle size distribution and a high degree of sphericity. In addition, the correspondingly prepared nanocrystalline soft magnetic composites (NSMCs) perform good service stability. In this paper, effects of the gas-atomization pressure and annealing temperature on the microstructure and soft magnetic properties of FeSiBCuNb powders and NSMCs are investigated. The results show that the powders obtained by a higher gas-atomization pressure possess a larger amorphous ratio and a smaller average crystallite size, which contribute to the better soft magnetic performance of the NSMCs. After being annealed at 550 °C for 60 min, the NSMCs show a much better performance than those treated by the stress-relief annealing process under 300 °C, which indicates that the optimization of the soft magnetic properties resulting from the precipitation of the α-Fe(Si) nanocrystalline largely overwhelms the deterioration caused by the grain growth of the pre-existing crystals. In addition, the annealed NSMCs prepared by the powders with the gas-atomization pressure of 4 MPa show the best performance in this work, = 33.32 ( = 100 kHz), = 73.08 A/m and = 33.242 mW/cm ( = 100 kHz, = 20 mT, sine wave).
通过气体雾化法制备的FeSiBCuNb粉末通常呈现出较宽的粒度分布和较高的球形度。此外，相应制备的纳米晶软磁复合材料（NSMCs）具有良好的服役稳定性。本文研究了气体雾化压力和退火温度对FeSiBCuNb粉末及NSMCs微观结构和软磁性能的影响。结果表明，较高气体雾化压力获得的粉末具有更大的非晶比和更小的平均晶粒尺寸，这有助于NSMCs具有更好的软磁性能。在550℃退火60分钟后，NSMCs表现出比在300℃下进行去应力退火处理的样品更好的性能，这表明α-Fe(Si)纳米晶析出导致的软磁性能优化在很大程度上超过了原有晶体晶粒长大引起的性能恶化。此外，在本工作中，由气体雾化压力为4MPa的粉末制备的退火NSMCs表现出最佳性能，μe = 33.32（f = 100kHz），Hc = 73.08A/m，Pcv = 33.242mW/cm³（f = 100kHz，Bm = 20mT，正弦波）。
