Seedless crystal casting technique requires high precision in the early growth and controlling process of crystal nucleus. One way to do it is to use the crucible which has slot at its bottom. The essentials of such an approach is to accurately control the temperature gradient during the directional solidification and the crystal growth rate to increase the size of polycrystalline grain, the dimension of the slot and the solidification rate determines the size of the crystal grain, the wider the slot is, the bigger the grain will be. Because there are too many parameters need to be controlled, the seedless crystal ingot process is particularly difficult.


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