On the one hand, the eddy current can be isolated, and the material is suitable for higher frequencies; on the other hand, due to the gap effect between the particles, the material has low magnetic permeability and constant magnetic permeability; and due to the small size of the particles, basically no aggregation occurs. skin phenomenon, the change of magnetic permeability with frequency is relatively stable; in addition, the powder core can be prepared into various shapes of special-shaped parts for different fields; finally, the industrially damaged strip can be pulverized into magnetic powder, and then made into magnetic powder. A magnetic powder core can be used to reduce losses and improve the use value of materials. The magnetoelectric properties of the magnetic powder core mainly depend on the magnetic permeability of the powder material, the size and shape of the powder, the filling factor, the content of the insulating medium, the molding pressure and the heat treatment process. In the future, the soft magnetic powder core will continue to follow high Bs, high μ, high Tc and low Pc. The magnetic powder core is a soft magnetic material
made by mixing ferromagnetic powder and insulating medium. Since the ferromagnetic particles are very small (0.55 μm used at high frequencies) and separated by non-magnetic electrical insulating film materials. Low Hc and high frequency, miniaturization and thinning are developing to meet the increasing thinning and thinning of magnetic components. The trend of miniaturization and even integration.
Characteristics and applications of nanocrystalline core
High permeability, nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy has high saturation magnetic induction. It has the characteristics of good stability, and the material becomes brittle after heat treatment, and it is easy to process into alloy powder. The alloy powder can be used to make a new type of ultra-microcrystalline magnetic powder core. Compared with the nanocrystalline magnetic core wound with tape, the magnetic permeability of the nanocrystalline magnetic powder core is still very low, and the soft magnetic performance is unstable. Problems that need to be solved urgently at present: 1. Effectively control the growth of nanocrystals during heat treatment; 2. Forming problems of magnetic powder cores; 3. Influence of heat treatment specifications on the soft magnetic properties of magnetic powder cores.
Application fields of nanomagnetic cores
Noise is the main source of circuit interference in many power electronic devices. It is necessary to use various filter components to reduce noise. As the main component of the differential mode inductor, the magnetic powder core plays a key role in the filter. In order to obtain a better filtering effect, the magnetic powder core material is required to have the following performance characteristics: high saturation magnetic induction, wide constant magnetic permeability, good frequency characteristics, good AC and DC superposition characteristics and low loss characteristics. In response to the above requirements, soft magnetic materials for inductors such as iron powder cores, notched amorphous alloy iron cores, and iron-nickel-aluminum powder cores (MPP powder cores) have been successively developed. These materials have exerted their respective advantages and effect. At present, UP powder cores occupy a major share in the high-end market, but due to the complex manufacturing process of M, namely powder cores, and the high price of raw materials, the price of powder cores remains high, and the scope of application is restricted to a certain extent. In recent years, iron-based nanocrystalline soft magnetic powder cores have attracted much attention due to their low price, simple preparation process, and excellent performance, and their research is quite active. It is expected to replace the local use of UP powder cores and be applied in high-frequency fields. .
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