Comparison of Magnetic Properties of Surface-Treated and Untreated Fe and FeNiMo Powders
Source abstract
Abstract
An innovative preparation route for iron-based soft magnetic materials is presented, focusing on the influence of the mechanical surface treatment of powder particles on their structural and magnetic properties. High-purity Fe (99.98% purity) and FeNiMo (supermalloy) powders were mechanically milled (ball-to-powder ratio of 6:1; 120 min), surface-treated by controlled milling, coated with an inorganic SiO2 insulating layer, and subsequently compacted into ring-shaped specimens. Structural characterization was carried out using optical microscopy and scanning electron microscopy. Magnetic properties were evaluated by hysteresis loop measurements, initial magnetization curves, and coercivity analysis at 200 K. The results demonstrate that mechanical surface treatment improves the homogeneity and continuity of the SiO2 insulating layer. This improvement leads to reduced coercivity from 2100 to 1980 A·m−1 for Fe powders, while FeNiMo powders showed a decrease from 1990 to 1910 A·m−1, along with lower energy losses. The proposed method provides a laboratory-scale approach for studying the influence of powder surface treatment on the magnetic behavior of Fe-based soft magnetic composites.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Magnetic Properties of Alloys · Magnetic Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Process Engineering, Faculty of Manufacturing Technologies, Technical University of Košice, Bayerova 1, 08001 Prešov, Slovakia
Department of Science, Art, Sport and Accreditation, Faculty of Humanities and Natural Sciences, University of Prešov, 17. Novembra 15, 08001 Prešov, Slovakia
Funding
Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Science · Slovak Research and Development Agency · Next Generation EU project
References (32)
Show source-provided references
1. Soft magnetic materials for a sustainable and electrified world10.1126/science.aao0195 ↗
2. Magnetic Soft Materials and Robots10.1021/acs.chemrev.1c00481 ↗
3. Soft magnetic materials and their applications in transformers10.1016/j.jmmm.2021.168210 ↗
4. Ordering kinetics of chemically synthesized FePt nanoparticles10.1016/j.jmmm.2007.02.072 ↗
5. Systematic investigation of particle size dependence of magnetic properties in soft magnetic composites10.1016/j.jmmm.2008.02.072 ↗
6. Correlating the Coating Cycles, Integrity and Magnetic Properties of Fe-Ni-Mo Soft Magnetic Composites by a Powder Atomic Layer Deposition Method10.1016/j.ceramint.2024.05.231 ↗
7. Advances in powder metallurgy soft magnetic composite materials10.1515/amm-2017-0168 ↗
8. Past, present, and future of soft magnetic composites10.1063/1.5027045 ↗
9. Soft magnetic composite materials (SMCs)10.1016/j.jmatprotec.2007.02.034 ↗
10. The Effect of Magnetization on the Production Process of Soft Magnetic Composite Stators of Axial Flux Motors10.1109/ACCESS.2025.3532207 ↗
11. Magnetic properties and power losses of inorganic, organic and hybrid based soft magnetic composites10.1016/j.ceramint.2024.10.362 ↗
12. Effects of compaction and heat treatment on the soft magnetic properties of iron based soft magnetic composites10.1088/2053-1591/ab6acc ↗
13. Eco friendly soft magnetic composites of iron coated by sintered ferrite via mechanofusion10.1016/j.jmmm.2021.168627 ↗
14. Pošković, E., Franchini, F., Ferraris, L., Fracchia, E., Bidulska, J., Carosio, F., Bidulsky, R., and Actis Grande, M. (2021). Recent advances in multi-functional coatings for soft magnetic composites. Materials, 14.10.3390/ma14226844 ↗
15. A new approach in the implementation of insulating layers in soft magnetic composite materials10.1016/j.jmmm.2024.171984 ↗
16. Microstructure Evolution and Soft Magnetic Properties of Fe-Based Nanocrystalline Soft Magnetic Composites Coated with Lubricant10.1016/j.apt.2023.104024 ↗
17. Preparation of iron oxide nanoparticles by mechanical milling10.1016/j.mineng.2010.08.025 ↗
18. Preparation of FeNiMo/SiO2 Composite Core and Regulation of Soft Magnetic Properties10.7498/aps.71.20212317 ↗
19. Bor, A., Jargalsaikhan, B., Lee, J., and Choi, H. (2020). Effect of different milling media for surface coating on the copper powder using two kinds of ball mills with discrete element method simulation. Coatings, 10.10.3390/coatings10090898 ↗
20. Effects of different mechanical and chemical surface post-treatments on mechanical and surface properties of as-built laser powder bed fusion AlSi10Mg10.1016/j.surfcoat.2022.128391 ↗
21. Olekšáková, D., Kollár, P., Neslušan, M., Jakubčin, M., Füzer, J., Bureš, R., and Fáberová, M. (2022). Impact of the surface irregularities of NiFeMo compacted powder particles on irreversible magnetization processes. Materials, 15.10.3390/ma15248937 ↗
22. Rudeichuk, T., Olekšáková, D., Maciaszek, R., Matysiak, W., and Kollár, P. (2024). Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties. Materials, 17.10.3390/ma17040862 ↗
23. Preparation and magnetic properties of NiFeMo powdered compacts of powder elements with smoothed surfaces10.1016/j.jmmm.2019.165770 ↗
24. Mechanical surface smoothing of micron-sized iron powder for improved silica coating performance as soft magnetic composites10.1016/j.apsusc.2020.147340 ↗
25. Research of Magnetic Properties of Spolic Technosols (Alcalic/Hyperartefactic) on the Landfill of Industrial Waste from Nickel Production10.2478/jee-2018-0083 ↗
26. The influence of mechanical milling on structure and soft magnetic properties of NiFe and NiFeMo alloys10.1016/j.jmmm.2007.03.111 ↗
27. Low Frequency Core Losses Components of FeNiMo Powder Compacted Materials10.12693/APhysPolA.133.639 ↗
28. Microstructure and magnetic properties of Fe–79%Ni–4%Mo alloy fabricated by metal injection molding10.1016/j.powtec.2013.11.011 ↗
29. Effect of Mo in-situ alloying on microstructure and magnetic properties of (NiFeMo)\100−xMo\x alloy10.1016/j.jallcom.2023.173012 ↗
30. Effect of Mo addition on AC soft magnetic property, hardness and microstructure of FeCoNiMox (0 ≤ x ≤ 0.25) medium entropy alloys10.1016/j.matchar.2023.113435 ↗
31. Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO2 insulation layer10.1039/D3RA01523H ↗
32. Effects of particle surface modification on magnetic behavior of soft magnetic Fe@SiO2 composites and Fe compacts10.1007/s10853-024-09881-1 ↗