Effect of order-disorder transition on magnetic properties of rapidly soldified high silicon-iron ribbons
The effect of ordering on the soft magnetic properties of 6.5% silicon-iron ribbons obtained by rapid solidification is studied. The atomic order cannot be prevented by the fast cooling. It is shown that isothermal aging at 700 degrees C induces a small decrease in coercive force and hysteresis losses, while aging at 500 degrees C induces an increase in these parameters. The magnetic evolutions are corroborated by Lorentz microscopy observations. The values obtained and the observations suggest a weak individual interaction, which may be due to local variation of exchange and anisotropy energy. >
Purity influence on the magnetic properties of Fe-6.5 wt% Si melt-spun ribbons
Abstract Two kinds of ribbons of Fe-6.5 wt% Si, with different residual impurity contents have been obtained by the planar-flow method. In the as-cast state, high-purity ribbons show magnetic properties twice as favourable as the electrolytic ribbons. After recrystallization at 1050°C, the magnetic properties of the two ribbon grades are practically the same. This behaviour difference is discussed in terms of the establishment of grain size and crystalline texture.
Magnetic Properties of Rapidly Quenched Fe–Al Alloys
Abstract Static and high-frequency magnetic properties of rapidly quenched 3.7–7.5 wt% Si—Fe ribbons, about 22–32 μm in thickness and 2 mm in width, have been studied. After annealing at 1200°C for 1 h, the magnetic properties for these alloys are much improved in regard to soft magnetic characteristics. The values of coercive force, initial and maximum permeabilities measured at 1 kHz and core loss measured at 0.1 T and 10 kHz are 55 A/m, 1.4 X 10 -3 H/m, 7 x 10 -3 H/m and 4.3 W/kg, respectively, in the optimum composition range 5–6 wt% Si.