Experimental study on surface quality of silicon ingots prepared by electromagnetic continuous casting

摘要

The effects of technical parameters on the forming of surface defects of the silicon ingots prepared by electromagnetic continuous casting were investigated by the orthogonal experiment, and the corresponding defect formation mechanisms were discussed and established. The results indicate that the forming of the ripple and lap are mainly caused by the shrinkage of shell and controlled by the electromagnetic pressure, and the unmelted granules are those moving from the center to the edge on the liquid surface, which was directly cooled by the cold crucible wall and kept as unmelted state. The surface quality was shown to be significantly improved by increasing the input power, pulling velocity and the heat preservation time, and among them, the input power is the most important one.