Refining of Metals and Metalloids by Zone-Melting Method (2nd Report). Zone-Melting in Al-Cu Alloy

Abstract

Some data on zone-melting were deduced with ordinary alloys, such as Al-Cu system, having a segregation coefficient of about 0.15. The results were compared with the theoretical curves obtained from Norman W. Lord’s formula. It was seen that the results greatly deviated from the theoretical curve, i.e. the number of molten-zone passage, the zone length and the rate of moving molten zone remarkably influenced the purification degree. Therefore, a further refining might be achieved by repeating the zone passage, or by moving it slowly, or by making the zone narrow. On the other hand, with increasing number of zone passage, or with decreasing rate of zone moving, the purified range decreased, and the starting edge of the molten-zone was not refined.