Assembling unidirectionally frozen alumina/camphene bodies for aligned porous alumina ceramics with larger dimensions

作者：Soon Young Mi; Shin Kwan Ha; Koh Young Hag^*; Choi Won Young; Kim Hyoun Ee

来源：Journal of the European Ceramic Society, 2011, 31(3): 415-419.

DOI：10.1016/j.jeurceramsoc.2010.09.019

• Suspensions
• Porosity
• Mechanical properties
• Apatite
• Biomedical applications

This paper proposes a novel way of producing aligned porous alumina ceramics with larger dimensions by assembling unidirectionally frozen alumina/camphene bodies, particularly those containing polystyrene (PS) polymer as the binder. The compressive strength of the samples sintered at 1450 degrees C for 3 h increased remarkably from 2 +/- 0.1 to 16 +/- 2 MPa with increasing PS content from 5 to 20 vol.% due to the prevention of cracks generally caused by drying shrinkage. In addition, frozen samples with a PS content of 20 vol.% could be assembled into larger dimensions without difficulty. The height of the assembled sample produced with a lamination number of 5 could be increased to similar to 24 mm without a severe decrease in compressive strength (16 +/- 3 MPa at a porosity of similar to 79 vol.%) due to the maintenance of an aligned porous structure with good interfacial bonding between the laminations.

• 出版日期2011-3