What are the main applications of ferrite magnetic materials?
Release time: May 28,2024
Soft ferrite
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).
permanent magnet ferrite
With barium ferrite
(BaO·6Fe2O3) and strontium ferrite (SrO·6Fe2O3). It has high resistivity and is a semiconductor type, so it has small eddy current loss and large coercive force. It can be effectively used in large-gap magnetic circuits, and is especially suitable for use as permanent magnets for small generators and motors. It does not contain precious metals such as nickel and cobalt. It has rich sources of raw materials, uncomplicated processes and low cost. It can replace AlNiCo permanent magnets. Its maximum magnetic energy product (B+H)m is lower, so it is larger than a metal magnet with equal magnetic energy. It has poor temperature stability, is brittle and fragile, and is not resistant to shock and vibration. It is not suitable for use as measuring instruments and magnetic devices with precision requirements. Permanent ferrite products are mainly anisotropic series. They can be used to make permanent magnet ignition motors, permanent magnet motors, permanent magnet concentrators, permanent magnet hanging heads, magnetic push bearings, magnetic separators, speakers, microwave devices, magnetic therapy tablets, hearing aids, etc.
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