Physicochemical and Accelerated Aging Tests of Metglas 2605SA1 and Metglas 2605HB1 Amorphous Ribbons for Power Applications

To evaluate the physicochemical compatibility of rapidly solidified ribbons with transformer insulating fluids, isothermal heating process was carried out in order to prove the sustainability of these materials. Fe-based amorphous ribbons were immersed in mineral and vegetable transformer oils for a period of 580 hours at 110 and 140°C. Chemical analyses of oils after experimentation have shown absence of amorphous alloys' components such as Fe, Si and B. In addition, a stability of magnetic properties is witnessed via the measurements of iron losses. Moreover, X-ray diffraction patterns of ribbons after aging experiments reveal a fully amorphous structure. Calculated lifetimes from accelerated aging test show a good stability of amorphous ribbons in field conditions.