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(11) | EP 0 254 932 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Heat treatment of rapidly quenched Fe-6.5 wt si ribbon |
| (57) A rapidly quenched Fe-Si alloy containing 6 to 7 wt% Si is heat treated to promote
and control any order-disorder reaction, thereby improving its ac core loss and exciting
power at induction levels above B=1.2 T. The alloy has a substantially <100> texture,
a grain size of about 1 to 2 mm, a B2 domain size of 100 to 850 nm, a DO3 domain size
of about 5 to 25 nm, an ac core loss of about 1.2 to 1.6 W/kg and an exciting power
of about 15 to 46 VA/kg, the core loss and exciting power being measured at an induction
level of B=1.4 T and a frequency of f=60 Hz. |