Comparative Properties of Porous Phyllosilicate-Based Ceramics Shaped by Freeze-Tape Casting

Porous phyllosilicate-based ceramics were manufactured by freeze-tape casting from clays of different particle size and morphology in order to characterize their microstructure stress rupture changes before after firing. Three raw selected: HCR (77% Halloysite–10Å), KORS (29% kaolinite), KCR kaolin (98% kaolinite). These exhibited a monomodal distribution used prepare four slurries, three with each clay material one consisting mixture labeled KHCR. After shaping casting, the porosity obtained biaxial flexural test collected for disk-like samples drying sintering at 1200 °C. Results showed that ceramic materials had highest bending strength (70 ± 1.1 MPa) those value (80 1%). SEM observation revealed difference texture porous materials. In disks, flattened pores appeared more textured, primary mullite crystallites formed rigid skeleton within amorphous phase. small quantity secondary needles which randomly dispersed vitreous The relatively important phase led bulk formation particles. values related presence mullite, as well (volume, morphology, pores) sintering.