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Share iron-based nanocrystalline alloys

by:Catech      2023-04-20

Iron-based nanocrystalline alloy is an amorphous material formed by a rapid solidification process of an alloy composed of iron as the main element and a small amount of Nb, Cu, Si, and B elements. After heat treatment, the amorphous material It can be obtained with a diameter of nanometer level and dispersedly distributed on the amorphous matrix, which is called microcrystalline and nanocrystalline materials.

Nanocrystalline materials have excellent comprehensive magnetic properties: high saturation magnetic induction (1.2T), high initial magnetic 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 permalloy (50-60μΩ/cm), and high Br (0.9) or low Br value (1000Gs) can be obtained by longitudinal or transverse magnetic field treatment ). It is the material with the best comprehensive performance on the market at present, and the best 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 core, current transformer core, leakage protection switch, common mode inductor core.

The magnetic permeability and Hc value of nanocrystalline alloy are close to crystalline high permalloy and cobalt-based amorphous, and the saturation magnetic induction Bs is equivalent to that of medium nickel permalloy, and the heat treatment process is simple. It is an ideal low-cost high-performance soft magnetic Material; Although the Bs value of nanocrystalline alloy is lower than that of iron-based amorphous and silicon steel, its high-frequency loss under high magnetic induction is much lower than them, and it has 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 when it is lower than 50kHz, and the magnetic core volume can be more than doubled.

In an age when FE based amorphous ribbon is increasingly important, the researchers believe manufacturers should pay close attention to their results.
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