Surface nucleation and cellular growth kinetics of cordierite glass ceramics containing 3 mol % Y2O3-ZrO2 |
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Authors: | Yuan -Jang Sue San -Yuan Chen Hong -Yang Lu Pouyan Shen |
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Affiliation: | (1) Institute of Materials Science and Engineering, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan;(2) Materials Research Laboratories, Industrial Technology Research Institute, 31015 Chutung, Taiwan |
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Abstract: | Cordierite-based glass ceramics of the 2MgO2Al2O35SiO2 composition with t-ZrO2 (3 mol% Y2O3-ZrO2) and P2O5 addition, was heat-treated isothermally and isochronically for crystallization studies. Major crystalline phases incurred by the heat treatment were t-ZrO2 and -cordierite. Surface nucleation predominated when edge and corner nucleation in these samples were suppressed regardless of their radii of curvature. Crystallization began with the formation of -quartz S.S. and its transformation to -cordierite was followed by prolonged heating. Cellular growth of -cordierite on the surface of the quenched glass plates, gave a linear kinetics. The activation energy for cellular growth was 410 kJ mol–1. |
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