Porous alumina ceramics with highly aligned pores by heat-treating extruded alumina/camphene body at temperature near its solidification point |
| |
Authors: | Young-Wook MoonKwan-Ha Shin Young-Hag Koh Won-Young ChoiHyoun-Ee Kim |
| |
Affiliation: | a Department of Dental Laboratory Science and Engineering, Korea University, Seoul, 136-703, Republic of Korea b Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Republic of Korea |
| |
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. |
| |
Keywords: | A Extrusion C Mechanical properties D Al2O3 E Biomedical applications Porous ceramics |
本文献已被 ScienceDirect 等数据库收录! |
|