Patent ID: 7004228
Filing Date: 2006-02-28
Classification: B22D,B82Y,C21D,C22C,H01F

Abstract:
1. A method of making a raw alloy for a magnet, the method comprising the steps of: preparing a molten alloy represented by Fe obtaining a thin-strip alloy, including an amorphous structure, by a strip casting process, in which the molten alloy is brought into contact with a chill roller within a vacuum or in a reduced pressure atmosphere so as to have a predetermined contact width in an axial direction of the chill roller and in which the molten alloy is moved along an outer circumference of the chill roller and cooled by rotating the chill roller; wherein the chill roller is rotated at a peripheral velocity of 3 m/s to less than 20 m/s, and wherein the molten alloy is continuously fed onto the chill roller at a feeding rate per unit contact width of 0.2 kg/min/cm to 5.2 kg/min/cm.