AMORPHOUS FE-B-SI ALLOYS EXHIBITING ENHANCED AC MAGNETIC PROPERTIES AND HANDLEABILITY

摘要

This invention is directed to metallic alloyconsisting essentially of iron, boron and siliconand having a composition in the region A, B, C,D, E, F, A of figure 1, said alloy having a crys-tallization temperature of at least about 490 °C,a saturation magnetization value of at leastabout 174.emu/g at 25ÀC, a core loss not greaterthan about 0.3 W/kg, measured at 25ÀC, 60 Hzand 1.4 T after having been annealed at 360ÀCfor about 2000 seconds, a core loss not greaterthan about 0.3 W/kg, measured at 25ÀC, 60 Hzand 1.4 T after having been annealed at about380ÀC for a time ranging from about 1000 toabout 2000 seconds, an exciting power require-ment not greater than about 1 VA/kg, measuredat 25ÀC, 60 Hz and 1.4 T after having been an-nealed at 360ÀC for about 2000 seconds, an ex-citing power requirement not greater than about1 VA/kg, measured at 25ÀC,.60 Hz and 1.4 T af-ter having been annealed at 380ÀC for about1000 seconds, a fracture strain of at least about.03, measured at 25ÀC for the alloy after havingbeen annealed at about 360ÀC for about 1.5hours, and a fracture strain of at least about .03,measured at 25ÀC for the alloy after havingbeen annealed at about 380ÀC for about 1.5 hours. The alloys exhibit improvedutility and handleability in the production ofmagnetic cores used in the manufacture of electric distribution and powertransformers.