Formation of Mixed-Powder composites with improved magnetic properties by adding carbonyl iron powders to FeSiCrB amorphous powder

• Published in: Journal of magnetism and magnetic materials Vol. 565; p. 170181
• Main Authors: Jun Woo, Hyuk, Woo Kim, Sang, Paul Kim, Choongnyun, Hyeok Choi, Dong, Kim, Sumin, Wha Lee, Bo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023
• Subjects: Amorphous; CIP; Core loss; Packing fraction; Permeability; Soft magnetic composites (SMCs); Amorphous; Packing fraction; CIP; Permeability; Core loss; Soft magnetic composites (SMCs)
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.170181

•According to a previous study [29], the best particle-size group of FeSiCrB amorphous was selected.•Packing fraction greatly affect permeability and core losses.•Using two-particle method, the packing fraction as well as magnetic properties can be increased.•With CIP addition to SMCs, the target magnetic properties can be satisfied. We investigated the changes in the magnetic properties of FeSiCrB amorphous powder because of the addition carbonyl iron powder (CIP) with different contents. With addition of CIP, the magnetization saturation value of the FeSiCrB amorphous powder effectively increased, and thus, an excellent DC-bias characteristic was expected. As the CIP content was increased to 20 wt%, the maximum packing fraction was obtained, and with further CIP addition, the packing fraction decreased. According to the Ollendorff formula, a higher packing fraction results in a higher permeability is obtained, and the composite with a CIP content of 20 wt% showed about 50 % higher permeability than that of the single-FeSiCrB amorphous powder composite. However, the core loss of the composite with a CIP content of 30 wt% was 69.77 kW/m3, which was the best value. Thus, it was confirmed that the magnetic properties could be selectively changed by adding CIP as a fine powder.