Research on Preparation and Properties of Fe-Si-Al Soft Magnetic Composites

Qing Da Li; X.W. Dong; T.X. Liu; Jun Hua You; Fa Zeng Lian

doi:10.4028/www.scientific.net/AMR.298.173

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Synthetic Technology and Performance of a Novel Fatty Alcohol Polyoxyethylene Carboxylate Surfactants
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Effect of Binder Materials on Magnetic Properties of Amorphous Fe₇₈Si₉B₁₃ Powder Core
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Research on Preparation and Properties of Fe-Si-Al Soft Magnetic Composites
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A Novel Model for Predicting Iron Losses of Electrical Steels Fed by PWM Inverter
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The Estimation for Position and Velocity of Moving Ball from Single Linear Array Image
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Synthesis, Characterization and Photocatalytic Property of Magnetic Titania Hollow Sphere Composite
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The Equivalent Proving of Two Typical Vector Composing PM Circuits and their Characteristic Analysis
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Research on Preparation and Properties of Fe-Si-Al Soft Magnetic Composites

Abstract:

The Fe-Si-Al soft magnetic composites were produced by cold pressing of water-atomized Fe-Si-Al powder using organic binder. The effect of shaping pressure, annealing temperature, magnetic annealing and dielectric content on properties of Fe-Si-Al soft magnetic composites was investigated. The results showed that increasing shaping pressure increases density and radial crushing strength of Fe-Si-Al soft magnetic cores, and decreases coercivity and total loss. Increasing annealing temperature can increase effective permeability and decrease total loss owing to decreasing hysteresis loss, and over-annealing (＞660°C) can deteriorate magnetic properties. The magnetic annealing can decrease total loss of Fe-Si-Al magnetic powder core. Increasing dielectric content can reduce the eddy current loss of Fe-Si-Al magnetic powder core and decrease the real part of permeability. Fe-Si-Al magnetic powder core with shaping pressure of 1800 MPa, annealing temperature of 660 °C and dielelctric content of 0.7% presented the optimum magnetic properties with an effective permeability of 127, a total loss of 78mW/cm3 and a radial crushing strength of 18MPa.