Fabrication and Microstructure Control of Continuously Porous Ceramics with Al2O3-(m-ZrO2) and t-ZrO2 Multilayer Shell
Novel continuously porous alumina (25%monoclinic-Zirconia) (Al2O3-(m-ZrO2)) and tetragonal Zirconia (t-ZrO2) composites were fabricated with concentric multilayer shells of Al2O3-(m-ZrO2) and t-ZrO2 by the multi-pass extrusion process. Nanocrystaline Al2O3-(m-ZrO2)/ t-ZrO2 powders and graphite powder as a pore forming agent were mixed with polymer in extrudable form. The microstructure was tailored in the green bodies by the extrusion process with high flexibility of control. The green body was burnt-out and sintered to obtain the continuously porous ceramics. The pore diameter and pore frame thickness were around 198±10.5 μm and 158.5±10.2 μm, respectively. The pore frame region was furnished with 9 alternating shells of Al2O3-(m-ZrO2) and t-ZrO2 with uniform thickness of about 17.6±1.1 μm. The interfaces of the alternate layers were designed corrugated shape. The detailed microstructure of the porous bodies was characterized by SEM techniques.
Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
S. K. Sarkar et al., "Fabrication and Microstructure Control of Continuously Porous Ceramics with Al2O3-(m-ZrO2) and t-ZrO2 Multilayer Shell", Solid State Phenomena, Vols. 124-126, pp. 1113-1116, 2007