Thick films of cordierite-based glass ceramics were prepared by aqueous tape casting from suspensions containing 80-wt% solids. The weight proportions of cordierite/glass ranged from 70/30 to 30/70 in order to investigate the effect of glass content on the rheological behaviour and on the microstructures and properties of the green tapes. Suspensions with 50 to 60-wt% glass content exhibited the lowest viscosity values among all the slurries investigated, while the green tape containing 30-wt% glass presented homogenous microstructures at both top and bottom surfaces, contrarily to the observations for the other compositions. The green densities increased with glass content. The sintered tapes (1150°C, 2h) containing 50 to 60-wt% glass exhibited the lowest values for the dielectric constant (∼5.2) and dielectric loss (∼0.002) at 1MHz.
|Number of pages||4|
|Journal||Materials Science Forum|
|Publication status||Published - 2004|
|Event||II International Materials Symposium: Materials 2003 and XI Encontro da Sociedade Portuguesa de Materiais, 2003 MATERIAIS - Caparica, Portugal|
Duration: 14 Apr 2003 → 16 Apr 2003
- Rheological behaviour
- Tape casting