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首页> 外文期刊>Journal of Crystal Growth >Silicon crystal morphologies during solidification refining from Al-Si melts
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Silicon crystal morphologies during solidification refining from Al-Si melts

机译：Al-Si熔体凝固精炼过程中的硅晶体形态

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To obtain a sound basis for further development of a refining process in which Si is precipitated from aluminium melts, a series of experiments have been performed in a Bridgman furnace. Compositions studied are in the range of 17-38% Si, and experiments have been carried out with the hot zone up and with the hot zone down to study the effects of flotation and sedimentation as well as those of different convection conditions on silicon precipitation. The similarity in density between liquid aluminium and silicon crystals implies that the melt convection is important forthe possible separation of the crystals in a gravity field, but the crystal morphologies also have to be controlled to avoid aluminum inclusions.At lower silicon contents the silicon morphologies have a fish-bone or star-like shape but as the Si content increases the morphology changes to a plate-like structure, which becomes coarser with increasing Si concentration. The growth pattern for coarse plates growing as (111) platelets tend to form pockets of aluminium, which will end up as inclusions during dissolution of the matrix.
机译：为了为进一步开发从铝熔体中析出Si的精炼工艺奠定良好的基础，已经在Bridgman炉中进行了一系列实验。所研究的成分在17-38％的Si范围内，并进行了热区向上和热区向下的实验，以研究浮选和沉降以及不同对流条件对硅沉淀的影响。液态铝和硅晶体之间密度的相似性表明，熔体对流对于重力场中晶体的可能分离很重要，但是还必须控制晶体形态以避免铝夹杂。在硅含量较低时，硅形态具有呈鱼骨状或星形，但随着Si含量的增加，其形态会转变为板状结构，并随着Si浓度的增加而变得更粗糙。随着（111）血小板的生长，粗板的生长方式趋于形成铝的囊袋，铝的囊袋最终会在基质溶解过程中以夹杂物的形式出现。

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