Amorphous and nanocrystalline alloys

- Apr 01, 2018 -

Iron-based amorphous alloys are competing with silicon steel in the industrial and intermediate frequency fields. Compared with silicon steel, iron-based amorphous alloys have the following advantages and disadvantages:

The iron-based amorphous alloy core filling factor is 0.84-0.86, compared with the silicon steel filling factor 0.90-0.95, the same weight of iron-based amorphous alloy core volume than the silicon steel core.

The saturation magnetic flux density Bs of iron-based amorphous alloys is lower than that of silicon steels, but at the same Bm, the loss of iron-based amorphous alloys is lower than that of 0.23 mm thick 3% silicon steels. Alloy strips are thin and have high resistivity. This is only one aspect. The more important reason is that the iron-based amorphous alloy is amorphous, the atomic arrangement is random, there is no magnetocrystalline anisotropy resulting from the orientation of atoms, and there are no crystals with local deformation and compositional shift. Grain boundaries. Therefore, an energy barrier that impedes domain wall motion and magnetic moment rotation is very small and has unprecedented soft magnetic properties, so the magnetic permeability is high, the coercive force is small, and the loss is low.