Devitrification behaviour of CaO−MgO(Y2O3)−SiO2 glasses |
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| Authors: | F Branda A Costantini A Buri A Tomasi |
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| Institution: | (1) Dipartimento di Ingegneria dei Materiali e della Produzione, Università di Napoli Federico II, Piazzale Tecchio, Napoli, Italy;(2) Istituto per la Ricerca Scientifica e Tecnologica, Trento, Italy |
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| Abstract: | In this paper a thermoanalytical study of the kinetic parameters and mechanism of the devitrification process of CaO·SiO2, 1.6CaO·0.4MgO·2SiO2 and 1.4CaO·(0.6/3)Y2O3·2SiO2 is reported. The experimental results suggest that, in the studied glasses, a surface nucleation process is operative; however, in finely powdered samples, that soften and efficiently sinter before devitrifying, surface nuclei behave as bulk nuclei. In this case lamellar crystalline structures are obtained. |
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| Keywords: | devitrification glasses kinetics wollastonite |
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