Popa Florin, Isnard Olivier, Neamțu Bogdan Viorel, Chicinaș Ionel
Materials Science and Engineering Department, Technical University of Cluj-Napoca, 103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania.
Institut Néel, CNRS/Université de Grenoble Alpes, 25 rue des Martyrs, BP 166, 38042 Grenoble, France.
Materials (Basel). 2023 Jan 7;16(2):592. doi: 10.3390/ma16020592.
Nanocrystalline powders from the Permalloy family, NiFe, NiFeMo, and NiFeCuMo, were obtained by mechanical alloying starting from elemental powders. All compositions were milled for up to 24 h in a high-energy planetary ball mill. The powders were single phase and nanocrystalline as determined by X-ray diffraction studies, with larger flatted particle sizes for NiFe (about 400 μm) and NiFeCuMo (about 470 μm), and smaller particle sizes for NiFeMo (about 170 μm). The homogeneity of the samples was verified by energy-dispersive X-ray spectroscopy (EDX). Soft magnetic composites were obtained by adding 3% of Araldite to the powders, followed by compaction at 700 MPa, and then polymerization. A very good powder covering by the polymer layer was proven by EDX elementals maps. The influence of composition change on the electrical resistivity of the compacts was studied. Hysteresis measurements in static and dynamic fields of up to 10 kHz were recorded, showing the influence of composition and particle size on the compact properties.
通过对元素粉末进行机械合金化，获得了坡莫合金系列的纳米晶粉末，即镍铁合金、镍铁钼合金和镍铁铜钼合金。所有成分在高能行星式球磨机中研磨长达24小时。经X射线衍射研究确定，这些粉末为单相纳米晶，其中镍铁合金（约400μm）和镍铁铜钼合金（约470μm）的扁平颗粒尺寸较大，而镍铁钼合金（约170μm）的颗粒尺寸较小。通过能量色散X射线光谱（EDX）验证了样品的均匀性。通过向粉末中添加3%的双酚A型环氧树脂，然后在700MPa下压实，再进行聚合反应，获得了软磁复合材料。EDX元素分布图证明聚合物层对粉末有很好的包覆效果。研究了成分变化对压块电阻率的影响。记录了高达10kHz的静态和动态场中的磁滞测量结果，显示了成分和颗粒尺寸对压块性能的影响。
