Abstract
The relationship between magnetic properties and particle size in nanocrystalline Fe 73.5 Cu 1 Nb 3 Si 15.5 B 7 alloy powder cores prepared by using a rotor mill and cold press was investigated. The powder cores having large particles of 250-850 pm exhibited stable permeability of 100 up to 500 kHz, a maximum level of 50 of quality factor at 50 kHz, and 360 mW/cm 3 core loss at 50 kHz and 0.1 T of induction. However the powder cores with small particles lower than 250 pm showed low permeability and high core loss as compared to large particle cores. Additionally the large particle cores have homogeneous and well-aligned microstructure leading to high density state. On the contrary, the powder cores composed of small magnetic particles showed irregular and complex distribution of magnetic powders, and the density seems rather low. The enhanced magnetic properties of powder cores with large particles were attributed to the particle size dependence of compressed state of powders.
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