Abstract
This study reports a novel way of increasing the pore size of highly aligned porous alumina ceramics by heat-treating an extruded alumina/camphene body at a temperature near its solidification point. The pore size obtained increased remarkably from 51 ± 8 to 125 ± 27 μm with increasing heat-treatment time from 1 to 24. h, due to the continuative overgrowth of the camphene dendrites during heat-treatment, while a highly aligned porous structure was preserved. In addition, interestingly, this heat-treatment enabled alumina walls to be densified quite well, whereas porous walls were observed in the sample produced without heat-treatment, which led to a considerable increase in compressive strength. The sample produced with a heat-treatment time of 12. h showed a high compressive strength of 11.6 ± 1.2. MPa at a porosity of approximately 84. vol%, which was much higher than that (0.28 ± 0.1. MPa) of the sample produced without heat-treatment.
Original language | English |
---|---|
Pages (from-to) | 1029-1034 |
Number of pages | 6 |
Journal | Journal of the European Ceramic Society |
Volume | 32 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2012 May |
Keywords
- A. Extrusion
- C. Mechanical properties
- D. Al O
- E. Biomedical applications
- Porous ceramics
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry