Glass and glass-ceramic coatings on ceramic tiles have been manufactured by plasma-spraying high-performance CAS (in wt%-SiO2, 60%; Al2O3, 15%; CaO, 23%; others, traces) and CZS (in Wt%-SiO2, 50%; CaO, 31%; ZrO2, 16.5%; Al2O3, 2%; others, traces) glass frits. The CZS system has a surface crystallization at about 1050 degrees C. Such behaviour would not easily allow to obtain a fully crystalline bulk glass-ceramic, but the defectiveness of the plasma-sprayed coating supplies many nucleation sites. Thus, it becomes completely crystalline and well sintered after a 850 degrees C for 30 min + 1050 degrees C for 15 min treatment. The CAS frit, designed not to produce significant crystallization, is well sintered after a 850 degrees C for 30 min + 950 degrees C for 30 min thermal treatment, but remains too brittle due to its glassy nature. A 1050 degrees C treatment allows a few pseudowollastonite crystals to form in a glassy matrix; their formation also hinders sintering. Thus, mechanical properties are inferior to heat-treated plasma-sprayed CZS. (c) 2006 Elsevier Ltd. All rights reserved.
Devitrification behaviour of plasma-sprayed glass coatings / Bolelli, Giovanni; Lusvarghi, Luca; Siligardi, Cristina; Manfredini, Tiziano. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - STAMPA. - 27(2007), pp. 623-628.
Data di pubblicazione: | 2007 |
Titolo: | Devitrification behaviour of plasma-sprayed glass coatings |
Autore/i: | Bolelli, Giovanni; Lusvarghi, Luca; Siligardi, Cristina; Manfredini, Tiziano |
Autore/i UNIMORE: | |
Rivista: | |
Volume: | 27 |
Pagina iniziale: | 623 |
Pagina finale: | 628 |
Codice identificativo ISI: | WOS:000243265100034 |
Codice identificativo Scopus: | 2-s2.0-33751019944 |
Citazione: | Devitrification behaviour of plasma-sprayed glass coatings / Bolelli, Giovanni; Lusvarghi, Luca; Siligardi, Cristina; Manfredini, Tiziano. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - STAMPA. - 27(2007), pp. 623-628. |
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