발간논문

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Vol.34, No.10, 1261 ~ 1269, 1996
Title
Research Paper - Transformations - : Effect of Process Variables on Formation of Amorphous Wires in Fe77.5Si7.5B15 Alloy
고흥석Hung Suk Ko, 문인기In Ge Moon, 최종술Chong Sool Choi
Abstract
The effect of process variables on the formation of amorphous wires has been investigated in the Fe_(77. 5)Si_(7. 5)B_(15) alloy. The in-rotating-water spinning process was used for the wire forming method. The longest amorphous wire was made when the V_I/V_w ratio was 0.85, where V_I is the velocity of the melt jet ejected from a nozzle and V_w is the speed of rotating cooling water. The V_I/V_w ratio should be in the range of 0.85±0.02 for the formation of a continuous wire longer than 5 m in length. The velocity of the melt jet increased with the square root of the pressure in a crucible. The stability of the melt jet increased with the pressure and decreased with the melt temperature. The continuity of the jet decreased with the increasing flying distance from a nozzle. Since the jet lost its characteristics of continuous flow at the flying distance of 4∼8 ㎜, the gap between a nozzle and water surface should be kept lower than that distance to obtain a continuous wire. It was found that the optimum melt temperature was 70∼80℃ higher than the melting point of the alloy in this spinning process.
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