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Iron silicon aluminum soft magnetic alloy
Iron-silicon-aluminum soft magnetic alloys
A soft magnetic alloy with a high initial permeability, containing about 9.5% of silicon, about 5.6% of aluminum, and Japan's increase in volume in 1931, first studied the magnetic properties of Fe-Si-Al alloys with different silicon-aluminum contents. In 1936 they reported an Fe-Si-Al alloy containing Si9.6% and Al5.4% and named Sendust. This alloy is poor in workability and can only be cast. In 1976, Yamamoto Japan added 2 to 4% of Ni to the alloy and heat-treated by magnetic field to improve the workability and magnetic properties. It was named as super-Fe-Si-Al alloy (super sendust). The cold technology produces a Fe-Si-Al alloy microcrystalline ribbon with a thickness of 20 to 110 m. The magnetic and process properties are improved. The magnetocrystalline anisotropy and the saturation magnetostriction of the Fe-Si-Al alloy are all close to zero, so The initial permeability () and maximum permeability () are high, the coercive force () and hysteresis loss are very low. Because of the high content of silicon and aluminum, the resistivity is high (≈100 μΩ·cm), and the eddy current loss is low. The alloy has good resistance to oxidation and corrosion, high hardness (HV≈500), and magnetic properties are not very sensitive to stress.
Fe-Si-Al alloy is mainly used as a magnetic head in the as-cast state, but it can also be made into a powder to replace the 80Ni-2Mo-Fe magnetic powder to make a high-frequency magnetic core powder core.
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