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Chemical composition of ferrite cores

2024-11-09

Ferrite is also called iron oxide or magnetic porcelain. For a class of non-metallic magnetic materials. It is a composite oxide (or ferrite) of magnetic ferric oxide and one or more other metal oxides. Ferrite is magnetic and has a higher permeability at high frequencies (higher than metal magnetic materials); its resistivity is much larger than metal magnetic materials, and it has higher dielectric properties.

Ferrite magnetic materials can be divided into soft magnetic, hard magnetic, spin magnetic, moment magnetic and pressure magnetic five categories according to their coercivity (to make the magnetized ferromagnetic lose magnetism and must be added to the external magnetic field strength opposite to the original magnetization direction) and use. Soft magnetic ferrite is easy to magnetize and demagnetize under weak magnetic field, such as Manganese zinc ferriteMn-ZnFe2O4 and nickel-zinc ferrite Ni-ZnFe2O4, the structure is spinel type; mainly for various inductive components, such as filters, transformers, antennas, etc. The magnetic core and the magnetic head of the recording and video recorder. Hard magnetic ferrite is not easy to demagnetize after magnetization, can retain magnetism for a long time, such as barium ferrite BaFe12O17, the structure is mostly magnetic plumbite type; mainly used as a constant magnetic source, in telecommunications, electroacoustics, electricity meters, motor industry can replace aluminum nickel cobalt hard magnetic metal materials. Rotary magnetic ferrite is also called microwave ferrite, such as nickel copper ferrite Ni-CuFe2O4 and yttrium garnet ferrite 3M2O3 · 5Fe2O3(M is trivalent yttrium, samarium, yttrium and other earth ions), used in radar, navigation, remote control and other electronic equipment. Moment magnetic ferrite has a rectangular hysteresis loop, such as lithium manganese ferrite Li-MnFe2O4, etc., generally used as memory components, used in electronic computer memory. Pressure magnetic ferrite magnetization, can be in the direction of the magnetic field for mechanical extension or compression, such as nickel-zinc ferrite Ni-ZnFe2O4, nickel-copper ferrite Ni-CuFe2O4, generally as magnetostrictive components, for ultrasonic transducers.

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