Abstract
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.
Original language | English |
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Pages (from-to) | 169-172 |
Number of pages | 4 |
Journal | Ceramics International |
Volume | 21 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1995 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry