Ferrite: A non-metallic magnetic material sintered from a composite oxide composed of one or more metal oxides (such as barium ferrite, strontium ferrite, manganese zinc ferrite, and nickel zinc ferrite).
Ferrite magnetic materials can be divided into soft magnetic, hard magnetic, rotational magnetic, moment magnetic, piezoelectric magnetic, and other ferrite materials. Their main characteristics are: high magnetic permeability, low coercive force, and low loss of soft magnetic materials; The coercivity Hc and magnetic energy product (BH) m of hard magnetic materials are high; Rotational magnetic materials have rotational magnetic properties, which means that electromagnetic waves propagate along a constant magnetic field direction. Rotational magnetic materials are mainly used in microwave communication devices. Moment magnetic materials have rectangular B-H hysteresis loops, mainly used for computer storage magnetic cores.
The main application fields of ferrite include: computer, microwave communication, television, automatic control, aerospace, instrumentation, medical, automotive industry, etc. Among them, the largest amount is used in hard and soft magnetic ferrite materials.
Process flow: batching → pre firing → crushing → ball milling → powder making → dry pressure magnetic field forming/dry pressure forming/wet pressure magnetic field forming → sintering → processing → inspection.
Disadvantages: the saturation magnetization is low, generally only 1/3~ ¼ This indicates that the magnetic energy stored in a unit volume of material is relatively low and cannot be applied in low-frequency, strong current, and high-power fields with high magnetic energy density.