| With the rapid developments of technology and industry, the requirements of high-performance metal and alloy are becoming more and more urgent.In the technology process of soft contact electromagnetic continuous casting of aluminium silicon alloy, compound purification devices of molten aluminium including porous ceramic net filtration device and bubble floating purification device is added to; furthermore the diameter of continuous casting billet is decreased so as to cast high quality aluminium silicon alloy billets.The experiment results show that adding compound purification devices to the electromagnetic continuous casting technology can improve the qualities and properties of aluminium silicon alloy billets. Tensile strength does not change much after purification, but elongation rate is increased obviously. The smaller the billet diameter, the higher elongation rate. The rapture mode of billet unpurified is primarily the mix of micro shrink holes along grain boundaries and through grain boundaries, and that of billet purified is mainly micro shrink holes through grain boundaries. Grain dimension of billet purified is smaller that that unpurified, and distribution of composite phase is more well-proportioned discontinuously along a dendrite boundary, and inclusion quantities on grain boundaries are decreased. When the diameter of billet purified is decreased, grain dimension is decreased too, and distribution of composite phase will be more well-proportioned.Al-Si alloy billets to be used for bonding wire prepared by this technology is compared to that used in production before, tensile strength and donation rate are increased by 30%, breaking diameter appeared in the wire drawing process decreased from 100um to 40um. It makes the productivity and benefit increase greatly.The electromagnetic continuouscasting apparatus of aluminium silicon alloy introduced before has been applied to the experiment of electromagnetic continuous casting of magnesium alloy. |
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