Authors
Department of Materials Engineering, Engineering Faculty, Tabriz University, Tabriz, Iran
Abstract
In this work, different composition of lithium aluminosilicate; Li2O-Al2O3-SiO2 (LAS) glass–ceramics was researched to achieve low–expansion glass ceramics. Nucleation and crystallization behavior of the base glass was studied with selection of the nucleating agents; TiO2, ZrO2, P2O5, Y2O3 and CeO2 were used in single, twin, triples and foursome composition by differential thermal analysis (DTA). In optimized samples, nucleation and crystallization temperature was determined by Day and Ray procedure. Phase analysis and Microstructure studies were done by X-ray diffractometry (XRD) and scanning electron microscopy (SEM), respectively. The composition that containing twin TiO2 and ZrO2 nucleating agents and triple nucleating agents; TiO2, ZrO2 and Y2O3 also TiO2, ZrO2 and CeO2 were shown lower crystallization temperature and sharper peak. XRD analysis of optimized samples was resulted h–Quartz as final phase, that by attention to coefficient of thermal expansion characteristic of this phase, recent products utilize as the thermal shock resistance glass–ceramic dishes.
Keywords
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