doiSerbia

Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique

Obradović Nina (Institute of Technical Sciences of SASA, Belgrade)
Filipović Suzana (Institute of Technical Sciences of SASA, Belgrade)
Đorđević Nataša (Institute for Technology of Nuclear and Other Raw Mineral Materials, Belgrade)
Kosanović Darko (Institute of Technical Sciences of SASA, Belgrade)
Pavlović Vladimir (Institute of Technical Sciences of SASA, Belgrade)
Olćan Dragan (School of Electrical Engineering, Belgrade)
Đorđević Antonije (School of Electrical Engineering, Belgrade + Serbian Academy of Sciences and Arts, Belgrade)
Kachlik Martin (CEITEC BUT, Brno University of Technology, Brno, Czech Republic)
Maca Karel (CEITEC BUT, Brno University of Technology, Brno, Czech Republic)

Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The mixtures of MgO-Al2O3-SiO2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of time of mechanical treatment.

Keywords: mechanical activation, two-step sintering, microstructure, electrical properties, cordierite