Hawelek Lukasz, Warski Tymon, Wlodarczyk Patryk, Polak Marcin, Zackiewicz Przemyslaw, Maziarz Wojciech, Wojcik Anna, Steczkowska-Kempka Magdalena, Kolano-Burian Aleksandra
Lukasiewicz Research Network-Institute of Non-Ferrous Metals, 5 Sowinskiego str., 44-100 Gliwice, Poland.
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta str., 30-059 Krakow, Poland.
Materials (Basel). 2020 Dec 22;14(1):5. doi: 10.3390/ma14010005.
The complex structural and magnetic studies of the annealed rapidly quenched Cu-free FeNiNbSiB alloy (metallic ribbons form) are reported here. Based on the calorimetric results, the conventional heat treatment process (with heating rate 10 °C/min and subsequent isothermal annealing for 20 min) for wound toroidal cores has been optimized to obtain the least lossy magnetic properties (for the minimum value of coercivity and magnetic core losses at 50 Hz). For optimal conditions, the complex permeability in the 10-10 Hz frequency range together with core power losses obtained from magnetic induction dependence up to the frequency of 400 kHz was successfully measured. The average and local crystal structure was investigated by the use of the X-ray diffraction method and the transmission electron microscopy observations and proved its fully glassy state. Additionally, for the three temperature values, i.e., 310, 340 and 370 °C, the glass relaxation process study in the function of annealing time was carried out to obtain a deeper insight into the soft magnetic properties: magnetic permeability and cut-off frequency. For this type of Cu-free soft magnetic materials, the control of glass relaxation process (time and temperature) is extremely important to obtain proper magnetic properties.
本文报道了退火快速淬火的无铜FeNiNbSiB合金（金属带形式）的复杂结构和磁性研究。基于量热结果，对绕制环形磁芯的传统热处理工艺（加热速率为10℃/min，随后等温退火20min）进行了优化，以获得损耗最小的磁性能（在50Hz时矫顽力和磁芯损耗的最小值）。在最佳条件下，成功测量了10 - 10Hz频率范围内的复磁导率以及从磁感应依赖性到400kHz频率范围内获得的磁芯功率损耗。通过X射线衍射法和透射电子显微镜观察研究了平均和局部晶体结构，并证明其处于完全玻璃态。此外，针对310、340和370℃这三个温度值，开展了玻璃弛豫过程随退火时间变化的研究，以更深入了解软磁性能：磁导率和截止频率。对于这类无铜软磁材料，控制玻璃弛豫过程（时间和温度）对于获得合适的磁性能极为重要。
