Anisotropic particle geometry effect on magnetism and microwave absorption of carbonyl iron/polyimide composites

Dong, Jie; Zhou, Wancheng; Wang, Chun‐Hai; Lu, Linlin; Luo, Fa; Zhu, Dongmei

doi:10.1016/j.jmmm.2019.165643

Cited by 13 publications

(1 citation statement)

References 34 publications

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“…However, FSC exhibit high hardness and brittleness leading to difficulties to consolidate to full density. Carbonyl iron powder (CIP) exhibits many advantages, such as low cost, high saturation magnetization, and low coercivity [ 14 , 15 , 16 ]. CIP is also extensively used in molding coils [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

FeSiCr Alloy Powder to Carbonyl Iron Powder Mixing Ratio Effects on the Magnetic Properties of the Iron-Based Alloy Powder Cores Prepared Using Screen Printing

2021

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A screen printing process was used to substitute dry molding to solve the uneven compaction problem in the coil center column during molding in this study. FeSiCr alloy powders (FSC) with a large particle size were mixed with fine spherical carbonyl iron powder to increase the compaction density. FSC to carbonyl iron powder (CIP) mixing ratio effects on magnetic paste rheological behaviors and magnetic properties of the molding coil prepared using screen printing were investigated. A magnetic paste with the lowest viscosity can be obtained using 3C7F (30% CIP + 70% FSC) due to the small-sized CIP adsorbed onto the FSC surface. This process reduces the interlocked network formation resulting from the CIP. The toroidal core with 3C7F exhibited the highest relative density and highest inductance. The coils with pure CIP and higher CIP content exhibited the better DC superposition characteristic. The toroidal core loss increased rapidly as the FSC content was increased. A proper trade-off between the inductance, DC-bias superposition characteristic, and magnetic core loss can be reached by choosing a suitable powder mixing ratio.

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