Crystallization of Inviscid Melt Spun (IMS) Calcia-Alumina (CA) Eutectic Fibers

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• 作者：Sung ; Yun-Mo ; Dunn ; Stanley A. ; Koutsky ; James A.
• 刊名：Ceramics International
• 出版年：1995
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：1995
• 卷：21
• 期：3
• 页码：169-172
• 文件大小：339 K

摘要

Crystallization behavior of vitreous calcia-alumina (CA) fibers of eutectic composition (46·5 wt%CaO-53·5 wt%Al₂O₃) was studied by differential thermal analysis (DTA), scanning electron microscopy (SEM) and X-ray diffraction (XRD). From DTA results, crystallization temperature of the CA fibers ranges from 948 to 1034°C according to DTA heating rates. The activation energy value for crystallization of the CA fibers was determined as 490 kJ/mol and 477 kJ/mol via Kissinger and Augis-Bennett methods, respectively. SEM for crystallized CA fibers showed surface roughness, whereas that for vitreous CA fibers showed typical glassy fracture. Wide angle X-ray diffractometer analysis on CA fibers which were crystallized by the DTA scans showed Ca₁₂Al₁₄O₃₃ formation as a major phase and CaAl₂O₄ formation as a minor phase.