Shi Bo, Li Chen, Han Ruoyu, Li Qifan, Li Pengfei, Chen Xi
State Key Laboratory of Mechatronics Engineering and Control, Beijing Institute of Technology, Beijing 100081, China.
School of Physics, Beijing Institute of Technology, Beijing 100081, China.
Materials (Basel). 2023 Mar 23;16(7):2544. doi: 10.3390/ma16072544.
Fe-Ni-based nanocrystalline coatings with unique magnetic properties are widely used as soft magnetic materials and usually act as the core component in electronic devices. Nanocrystallized particles and thin films have become a popular contemporary research direction. Electrical explosion, characterized by an ultrafast atomization and quenching rate (d/d ~ 10-10 K/s) for the material, is a unique approach for the rapid "single-step" synthesis of nanomaterials and coatings. In this study, experiments were carried out with intertwined wire under a directional spraying device in atmospheric Ar ambience. Two load systems of Fe-Ni and Fe-Ni-Co were considered in this work. Electrical parameters and high-speed camera images were obtained to reveal the physical mechanism and dynamic process of explosive spraying. The morphologic and crystallographic results were characterized by SEM and XRD. The magnetic properties were measured via VSM equipment, and the parameters of saturation magnetization , residual magnetization , and coercivity were emphasized in the hysteresis loop pattern. The experimental results indicate that a dense coating was prepared with extremely low porosity, and the morphology of the coating surface shows different regions characterized by solidified chunks and loose particles. XRD patterns showed that crystalline structures were discrepant under two load systems with different Ni weight proportions. Magnetic measurements gave a thin and narrow hysteresis loop, which represents loops with good soft magnetic properties. Quantitatively, coercivity decreased from 59.3 to 52.6 and from 121.0 to 49.9 for the coatings not containing and containing Co under parallel and perpendicular fields, respectively.
具有独特磁性能的铁镍基纳米晶涂层作为软磁材料被广泛应用，通常用作电子设备的核心部件。纳米晶颗粒和薄膜已成为当代热门的研究方向。电爆炸以超快的雾化和淬火速率（d/d ~ 10-10 K/s）为材料特征，是一种快速“一步法”合成纳米材料和涂层的独特方法。在本研究中，在大气氩气氛下的定向喷涂装置下，使用交织线进行了实验。本工作考虑了铁镍和铁镍钴两种负载系统。获取了电参数和高速相机图像，以揭示爆炸喷涂的物理机制和动态过程。通过扫描电子显微镜（SEM）和X射线衍射仪（XRD）对形貌和晶体结构结果进行了表征。通过振动样品磁强计（VSM）设备测量磁性能，并在磁滞回线图中强调了饱和磁化强度、剩余磁化强度和矫顽力等参数。实验结果表明，制备出了孔隙率极低的致密涂层，涂层表面形貌呈现出以凝固块和松散颗粒为特征的不同区域。XRD图谱表明，在两种不同镍重量比例的负载系统下，晶体结构存在差异。磁测量给出了细窄的磁滞回线，这代表具有良好软磁性能的回线。定量地说，对于不含钴和含钴的涂层，在平行和垂直场下，矫顽力分别从59.3降至52.6以及从121.0降至49.9。
