| 摘要 |
PURPOSE:To obtain an amorphous alloy thin belt whose plate thickness and width thereof is large and soft magnetic property is excellent, by a method where in melt of Fe-B-Bi-C System alloy is quenched at cooling speed of at least 1,000 deg.C/sec within temp. zone from 500 deg.C-300 deg.C. CONSTITUTION:An amorphous alloy thin belt 1 is obtained by means that melt of an alloy, whose main constituent is Fe and B, Si and C are contained is blasted off from a nozzle 5 to a roll 2 and is quenched and solidified. The composition of the alloy is 70-85a t% Fe, 6-18a t% B, 2-18a t% Si and 0-4a t% C. The nozzle 5, which has plural slot-shape aperture (unshown in figure), is used. The temp. indicator 3, 4 contacting to the roll 2 are quenched so that cooling speed comes to be at least 1,000 deg.C within zone from 500 deg.C to 300 deg.C. In such a manner, an amorphous ally thin belt, whose plate thickness is 65mum or more and width of a plate 20mm or more, also excellent soft magnetic property can be obtained. |
