https://scholars.lib.ntu.edu.tw/handle/123456789/73423
標題: | Growth of Tabular alpha-Al2O3 Grains on Porous Alumina Substrate | 作者: | 韋文誠 | 關鍵字: | Al2O3, Aluminosilicate, porous, anisotropy, grain growth | 公開日期: | 二月-2008 | 起(迄)頁: | - | 來源出版物: | Journal of the American Ceramic Society | 摘要: | Gradient, porous alumina ceramics were prepared with the characteristics of micro-sized tabular alpha-Al2O3 grains grown on a surface with a fine interlocking feature. The samples were made by spin-coating diphasic aluminosilicate sol on porous alumina substrates. The sol consisted of nano-sized pseudo-boehmite (AlOOH) and hydrolyzed TEOS [Si(OC2H5)4]. After drying and sintering at 1150-1450oC, the crystallographic and chemical properties of the porous structures were investigated by analytical electron microscopy (AEM). The results show that the formation of tabular alpha-Al2O3 grains is controlled by the dissolution of fine Al2O3 in the diphasic material at the interface. The nucleation and growth of tabular alpha-Al2O3 grains proceeds heterogeneously at the Al2O3/glass interface by ripening nano-sized Al2O3 particles. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/64140 |
顯示於: | 材料科學與工程學系 |
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2008-JACerS-Tablular AlO.pdf | 1.08 MB | Adobe PDF | 檢視/開啟 |
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