Study of Novel Fe-Based Amorphous/Nanocrystalline Soft Magnetic Powder Cores with NiCuZnFe2O4 Coating Layer

• Published in: Journal of superconductivity and novel magnetism 2021-09, Vol.34 (9), p.2389-2396
• Main Authors: Zhang, Chaohan, Tao, Pingjun, Zhu, Kunsen, Chen, Yugan, Zhang, Weijan, Yang, Yuanzheng
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-021-05920-z

The FeSiBCuNb amorphous powder prepared by the ball mill crushing was used as the raw material, and the FeSiBCuNb/NiCuZnFe 2 O 4 core–shell structure was prepared by chemical coprecipitation. The soft magnetic powder cores (SMPCs) were then produced from the mixture of the qualified powders with 1 wt% epoxy resin as bonding materials by cold pressing under a compact pressure of 1600 MPa. The evolution of the high-frequency properties for the SMPCs with respect to the annealing temperature was systematically studied. The results show that the prepared NiCuZnFe 2 O 4 were evenly coated on the surface of FeSiBCuNb amorphous powder, forming a fine insulating layer. After annealing at the optimal temperature, the SMPCs exhibit excellent magnetic properties: high effective permeability of 80.6 with high-frequency stability up to 2000 kHz; low core loss of 78.18 W/kg at 100 kHz for Bm = 0.1 T, which effectively reduces the high-frequency loss of the SMPCs. The research results are of great significance for the development and performance optimization of the amorphous/nanocrystalline SMPCs.