交替复合磁场去除铝熔体中夹杂物的研究

Investigation on the Removal of Inclusions Form Aluminum Melt Using Alternating Combined Magnetic Field

摘要:

本文将铝硅过共晶合金凝固过程中析出的初生硅颗粒视为铝熔体中的夹杂物颗粒，研究了由交替旋转磁场和下行波磁场组成的交替复合磁场对铝熔体中夹杂物的去除效果。结果表明，在交替复合磁场作用下，夹杂物颗粒发生了明显的聚合并迁移至顶部被除去。对比发现交替复合磁场的除杂效果要优于单向旋转磁场和下行波磁场组成的单向复合磁场。随着交替复合磁场中的交替旋转磁场的频率和电流的增加，磁场除杂效果显著上升。交替时间为10s时磁场除杂效果最佳。

Abstract:

In this study, the effect of alternating combined magnetic field composed (CMF) of downward travelling magnetic field (TMF) and alternating rotating magnetic field (RMF) to remove the inclusions from aluminum melt was investigated and primary silicon particles precipitating from the solidification of Al-Si hypereutectic alloy were regarded as inclusions need removing. Inclusions particles agglomerated into clusters and migrated to the top of the melt under alternating CMF. It was found alternating CMF had a better removing effect than oriented CMF composed of oriented RMF and downward TMF. The removing effect of alternating CMF increased when the current and frequency of alternating RMF consisting of alternating CMF increased. Alternating CMF had the best removing effect when the alternating time was at 10s.