液硅在耐高温材料上的润湿性对于低成本太阳能电池生产过程中硅的精炼和铸造具有重要的研究意义.为了研究液硅的润湿性,采用座滴法分别研究真空和氩气气氛以及不同温度条件下液硅在高纯石墨以及刚玉基底材料上的接触角.实验结果表明,高纯石墨基底材料表面越粗糙,液硅所形成的接触角越小,从而润湿性越好;真空条件下液硅在刚玉上的接触角并没有随着加热温度的上升呈现下降的趋势,而是在88°～90°的范围内波动,分析图像的过程中可明显看到液硅在刚玉基底材料上左右来回蠕动的现象.
The wetting behavior of molten silicon as a refractory materials is important in the refining and casting of silicon for producing the low-cost solar cells.In order to investigate the wettability,the contact angles of molten silicon dropping on the high-purity graphite and corundum substrates are measured in vacuum and argon atmosphere,respectively,at different temperatures by the sessile drop method.Experimental results show that the rougher the surface of graphite substrate is,the smaller the contact angle is,and then the the wettability becomes better.Moreover,the contact angle of molten silicon on corundum substrate does not decrease but fluctuates within a small range of angle with the increase of time and temperature,because the molten silicon moves back and forth obviously during the process of image analysis.
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