Iron-based nanocrystalline alloy is an amorphous material formed by the rapid solidification process of an alloy composed of iron elements and a small amount of Nb, Cu, Si, and B elements. It can be obtained with a diameter of nanometer level, which is dispersed and distributed on an amorphous matrix, which is called microcrystalline and nanocrystalline materials.
Nanocrystalline materials have excellent comprehensive magnetic properties: high saturation magnetic induction (1.2T), high initial permeability (8×104), low Hc (0.32A/M), low high frequency loss under high magnetic induction (P0 .5T/20kHz=30W/kg), the resistivity is 80μΩ/cm, which is higher than that of permalloy (50-60μΩ/cm). After longitudinal or transverse magnetic field treatment, high Br (0.9) or low Br value (1000Gs) can be obtained. ). It is a material with better comprehensive performance on the market at present, and the normal frequency range: 20kHz-50kHz. Widely used in high-power switching power supply, inverter power supply, magnetic amplifier, high-frequency transformer, high-frequency converter, high-frequency choke coil core, current transformer core
, leakage protection switch, common mode inductor core.
The magnetic permeability and Hc value of the nanocrystalline alloy are close to the crystalline high permalloy and cobalt-based amorphous, and the saturation magnetic induction Bs is comparable to that of the medium nickel permalloy. The heat treatment process is simple, and it is an ideal low-cost high-performance soft magnetic Material
s; although the Bs value of nanocrystalline alloys is lower than that of iron-based amorphous and silicon steels, their high-frequency losses under high magnetic induction are much lower than those of them, and they have better corrosion resistance and magnetic stability. Compared with ferrite, nanocrystalline alloy has 2 to 3 times higher working magnetic induction on the basis of lower loss at lower than 50kHz, and the magnetic core volume can be more than doubled.