Amorphous alloy ribbon and method of manufacturing the same

摘要

A method of making an amorphous alloy ribbon according to the present disclosure includes: preparing an amorphous alloy ribbon having a composition composed of Fe, Si, B, C and inevitable impurities (hereinafter, "alloy ribbon"); and, in a state in which the alloy ribbon is tensioned with a tensile stress of 20 MPa to 80 MPa, increasing a temperature of the alloy ribbon to a maximum target temperature which is in a range of 410 ° C to 480 ° C with an average temperature increase rate from 50 ° C / s to less than 800 ° C / s, and lowering a temperature of the alloy strip thus heated from the maximum target temperature to a temperature of a heat transfer medium for temperature reduction with an average temperature reduction rate of 120 ° C / s to less than 600 ° C / s, and producing an alloy ribbon having a composition of FeBSiC (a, b: atomic part in the composition, c: atomic part of C with respect to a total of 100.0 atomic% of Fe, Si and B, 13.0 Atom% ≤ a ≤ 16.0 atom%, 2.5 atom% ≤ b ≤ 5.0 atom%, 0.20 atom% ≤ c ≤ 0.35 atom% and 79.0 atom% % ≤ (100-ab) ≤ 83.0 atomic%).