Development of cordierite-based glass-ceramics by slip casting through selecting the appropriate sintering conditions

Mohammad Javad Maleki; Hudsa Majidian; Sara Banijamali; Mohammed Zakeri

doi:10.53063/synsint.2022.22116

Mohammad Javad Maleki ¹
Hudsa Majidian ¹
Sara Banijamali ¹
Mohammed Zakeri ¹

¹ Ceramics Department, Materials and Energy Research Center (MERC), Karaj, Iran

https://doi.org/10.53063/synsint.2022.22116

Abstract

The present work aims to prepare a dense cordierite-based glass-ceramic through slip casting and consequent heat treatment procedures. In this regard, sintering conditions were considered as the key variables to improve the properties of the glass-ceramic. For this purpose, glass frit powder was prepared through melting oxide powders (in the system of SiO₂-Al₂O₃-TiO₂-K₂O-CaO-MgO). The mixed powders were then heat treated at 1450 °C for 1 hour and quenched in water. The glass frit powder was slip cast using the appropriate dispersant. Sintering was carried out by one-step, two-step, and three-step procedures. Specimens were characterized in terms of various analysis techniques including dilatometry, X-ray diffractometry, scanning electron microscopy, and mechanical strength measurement. Among the examined specimens, the sample sintered by a three-step approach was considered the optimized one which attained zero porosity. According to the obtained results, cordierite crystals were observable in this glass-ceramic matrix. A low coefficient of thermal expansion and a low dielectric constant were observed for the optimized glass-ceramic sample. The obtained results confirmed that the homogenous distributions of crystalline phases are responsible for the appropriate and desirable properties of the prepared glass-ceramic.

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Keywords: Cordierite, Glass-ceramic, Slip casting, Sintering

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