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Introduction to the characteristics of nanocrystalline core
On the one hand, it can isolate eddy current, and the data is suitable for higher frequency; On the other hand, due to the gap effect between particles, the data has low permeability and constant permeability; Because the particle size is small, there is basically no scaling phenomenon, and the change of permeability with frequency is relatively stable; In addition, the powder core can be made into special-shaped parts of various shapes for different fields; Finally, the industrial damaged strip is crushed into magnetic powder and then made into magnetic powder core, which can reduce the loss and improve the use value of data. The magnetoelectric properties of magnetic particle core mainly depend on the permeability of powder material, size and shape of powder, filling coefficient, content of insulating medium, forming pressure and heat treatment process. In the future, the soft magnetic particle core will continue to follow the principle of high BS and high μ、 High Tc, low PC. Magnetic powder core is a soft magnetic material made of ferromagnetic powder and insulating medium. Because ferromagnetic particles are very small (0.55 for high frequency) μ m) Therefore, they are separated by a non-magnetic electrical insulating film. Low HC, high frequency, miniaturization and thinness are developing to meet the increasing trend of thin film, miniaturization and even integration of magnetic components.
Characteristics and application of nanocrystalline magnetic core
Nanocrystalline alloys have high saturation magnetic induction. Good stability, brittle after heat treatment, easy to process into alloy powder. It is possible to make a new type of ultramicrocrystalline magnetic powder core with this alloy powder. The magnetic permeability of nanocrystalline magnetic particle core is still very low compared with that of nanocrystalline magnetic core wound with tape, and the soft magnetic performance is unstable. Problems waiting to be solved:
1. Effectively control the growth of nanocrystals during heat treatment;
2. Forming of magnetic particle core;
3. Effect of heat treatment specification on soft magnetic properties of magnetic particle core.
Application field of nano magnetic core
In many power electronic devices, noise is the main interference source of the circuit. Various filters are required to reduce noise. As the main component of differential mode inductance, magnetic particle core plays a key role in filter. In order to obtain better filtering effect, the magnetic particle core material is required to have the following performance characteristics: high saturated magnetic induction, wide constant permeability, good frequency characteristics, good AC / DC superposition characteristics and low loss characteristics. In response to the above requirements, soft magnetic materials for inductors, such as iron powder core, notched amorphous alloy core and iron nickel aluminum powder core (MPP powder core) have been developed one after another. These materials play their respective advantages and roles under different application conditions. At present, up powder core occupies a major share in the high-end market. However, due to the complex manufacturing process of M powder core, the high price of raw materials and the high price of powder core, its scope of application is limited to a certain extent. In recent years, iron-based nanocrystalline soft magnetic powder core has attracted much attention because of its low price, simple preparation process and excellent performance. Its research is quite active and is expected to replace the local use of up powder core and be applied in the field of high frequency.
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