Hydration of Cab>7b>ZrAlb>6b>Ob>18b> phase

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• 作者：Dominika Madej ; ^{dmadej@agh.edu.pl} ; Jacek Szczerba ; Wiesł ; awa Nocuń ; -Wczelik ; Ryszard Gajerski
• 关键词：B. X-ray methods ; B. Microstructure-final ; Ca7ZrAl6O18 ; Hydration ; Unshaped refractories (castables)
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3821-3827
• 文件大小：1372 K

摘要

The hydraulic properties of the Cab>7b>ZrAlb>6b>Ob>18b> (Cb>7b>Ab>3b>Z) phase as well as the hydration products and thermal decomposition mechanism of this hydrated phase were studied. Microcalorimetric analysis has shown that the Cb>7b>Ab>3b>Z phase reacts with water very quickly, especially in the first 2 h after the start of the experiment. Hydration of calcium zirconium aluminate proceeds with the formation of high refractory calcium zirconate (with melting point 2345 掳C), apart from the hydrated, nearly amorphous material. According to the DTA-TG-EGA, FT-IR and SEM/EDS examinations it has been found that not only the hydrates CAHb>10b>, Cb>2b>AHb>8b> and Cb>4b>AHb>19b> are present, but also Cb>3b>AHb>6b> (C = CaO, A = Alb>2b>Ob>3b>, H = Hb>2b>O), the only hydrated calcium aluminate which is a thermodynamically stable phase above 40 掳C. Unhydrated Cab>7b>ZrAlb>6b>Ob>18b> and CaZrOb>3b> phases have been found by XRD, but crystalline hydrates have not been detected.