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

Abstract

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.