| Title |
Research Paper - Transformations - : Effect of Process Variables on Formation of Amorphous Wires in Fe77.5Si7.5B15 Alloy |
| Authors |
고흥석(Hung Suk Ko); 문인기(In Ge Moon); 최종술(Chong 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. |