Magnetic penetration investigation on the bands made of amorphous magnetically soft (CoFe)75Si10B15 alloys under the thermal processing

Abstract

The effect of isothermal storage temperature and cooling rate on thermal processing on the maximum magnetic penetration in amorphous bands of magnetically soft [Formula: see text] alloys was studied. The dependence of maximum magnetic penetration on the isothermal storage temperature is determined using diffusion processes which occur during thermal processing at the certain isothermal storage temperatures. It is clear that increase of cooling rate directly impacts on the magnetic properties. Magnetic properties have been approached after thermal treatment of the surface when the surface is amorphous and at a certain optical thickness during formation of the amorphous-crystalline layer due to the increasing cooling speed.

Prospects to Use Amorphous Fe–Ni–Si–B Ribbons in Contactor Cores

“…However, there is a dependence of the microcrystallisation degree on the annealing time. The growth rate of microcrystals formed during the annealing with and without magnetic field also decreases [17]. Based on the obtained results, we can define the experimental modes for a complex processing of materials as follows: keeping the amorphous specimen containing Fe 39 Ni 39 Si 9 B 13 at 240 ∘ C for 90 min in order to reduce stresses after a plastic deformation under the pressure of 75-125 kPa, then performing the thermal processing at a temperature of 360 ∘ C, where the atomic pair ordering processes are activated due to the diffusion, below the Curie temperature, for 200 min in a magnetic field.…”