What are the main applications of ferrite magnetic materials?

There are manganese ferrite (MnO·Fe2O3), zinc ferrite (ZnO·Fe2O3), nickel-zinc ferrite (Ni-Zn·Fe2O4), manganese-magnesium-zinc ferrite (Mn-Mg-Zn·Fe2O4), etc. Single or multi-component ferrites. The resistivity is much larger than that of metallic magnetic materials, and it has higher dielectric properties, so ferrites with both ferromagnetic and ferroelectric properties as well as ferromagnetic and piezoelectric properties appear. It has much higher magnetic permeability than metallic magnetic materials (including iron-nickel alloy, aluminum-silicon ferroalloy) at high frequencies, and is suitable for working at frequencies from several kilohertz to hundreds of megahertz. Processing ferrite is a general ceramic process, so the process is simple, saves a lot of precious metals, and is low cost. The saturation magnetic flux density Bs of ferrite is low, usually only 1/3 to 1/5 of iron. The magnetic energy stored in ferrite per unit volume is low, which limits its application in low-frequency, strong electric and high-power fields that require higher magnetic energy density. It is more suitable for applications in high frequency, low power, and weak current situations. Nickel-zinc ferrite can be used as antenna rods and intermediate frequency transformer cores in radios, and manganese-zinc ferrite can be used as the line output transformer core in television receivers. In addition, soft ferrite is also used in inductors and filter cores in communication lines. In recent years, it has also been used as a high-frequency magnetic recording transducer (magnetic head).

May 28,2024

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