| Preparation and characterization of SiO2 non-catalytic nucleation coating for the solidification of undercooled melt |
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| 作者姓名： | XI Zengzhe YAO Xi ZHANG Liangying |
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| 作者单位： | Functional Materials Research Laboratory of Tongji University, Shanghai 200092, China,Functional Materials Research Laboratory of Tongji University, Shanghai 200092, China,Functional Materials Research Laboratory of Tongji University, Shanghai 200092, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 59995520) and the University Key Studies Project of Shanghai |
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| 摘 要： | SiO2 non-catalytic nucleation films were coated onto a ceramic substrate and the inner surface of a ceramic crucible by the Sol-Gel method. The surface morphology of the coatings was characterized with an atomic force microscope and a scanning electronic microscope. The non-catalytic effect of the coating on the heterogeneous nucleation of metal melts was tested through measuring the nucleation undercooling. Investigation results indicated that the prepared coating could act as a baffle-wall to prevent the metal melt from nucleating heterogeneously on the inner surface of the crystalline crucible. The tiny holes with a diameter below 2 μm and heaves on the coating surface have no evident effect on the undercooling of metal melts. For a poly-layer coating, the super-layer can cover the cracks in the sub-layers, which prevents the cracks in the coating from spreading in the direction vertical to the coating layers and thus eliminates the effect of cracks on the coating.
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| 关 键 词： | high undercooling catalytic nucleation non-crystalline coating sol-gel bismuth atomic force mic |
Preparation and characterization of SiO2 non-catalytic nucleation coating for the solidification of undercooled melt |
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| XI Zengzhe,YAO Xi,ZHANG Liangying.Preparation and characterization of SiO2 non-catalytic nucleation coating for the solidification of undercooled melt[J].Progress in Natural Science,2003,13(2):125-129. |
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| Authors: | XI Zengzhe YAO Xi ZHANG Liangying |
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| Institution: | Functional Materials Research Laboratory of Tongji University, Shanghai 200092, China |
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| Abstract: | SiO2 non-catalytic nucleation films were coated onto a ceramic substrate and the inner surface of a ceramic crucible by the Sol-Gel method. The surface morphology of the coatings was characterized with an atomic force microscope and a scanning electronic microscope. The non-catalytic effect of the coating on the heterogeneous nucleation of metal melts was tested through measuring the nucleation undercooling. Investigation results indicated that the prepared coating could act as a baffle-wall to prevent the metal melt from nucleating heterogeneously on the inner surface of the crystalline crucible. The tiny holes with a diameter below 2 μm and heaves on the coating surface have no evident effect on the undercooling of metal melts. For a poly-layer coating, the super-layer can cover the cracks in the sub-layers, which prevents the cracks in the coating from spreading in the direction vertical to the coating layers and thus eliminates the effect of cracks on the coating. |
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| Keywords: | high undercooling catalytic nucleation non-crystalline coating sol-gel bismuth atomic force mic |
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