| 일축배향 기공채널과 향상된 압축강도를 갖는 다공질 알루미나/뮬라이트 층상 복합체 |
| 김규헌, 김태림, 김동현, 윤석영, 박홍채 |
| 부산대학교 재료공학부 |
| Porous Alumina/Mullite Layered Composites with Unidirectional Pore Channels and Improved Compressive Strength |
| Kyu Heon Kim, Tae Rim Kim, Dong Hyun Kim, Seog Young Yoon, Hong Chae Park |
| School of Materials Science and Engineering, Pusan National University |
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| ABSTRACT |
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Three-layer porous alumina-mullite composites with a symmetric gradient porosity are prepared using a controlled freeze/gel-casting method. In this work, tertiary-butyl alcohol (TBA) and coal fly ash with an appropriate addition of $Al_2O_3$ were used as the freezing vehicle and the starting material, respectively. When sintered at $1300-1500^{circ}C$, unidirectional macro-pore channels aligned regularly along the growth direction of solid TBA were developed. Simultaneously, the pore channels were surrounded by less porous structured walls. A high degree of solid loading resulted in low porosity and a small pore size, leading to higher compressive strength. The sintered porous layered composite exhibited improved compressive strength with a slight decrease in its porosity. After sintering at $1500^{circ}C$, the layered composite consisting of outer layers with a 50 wt% solid loading showed the highest compressive strength ($90.8{pm}3.7MPa$) with porosity of approximately 26.4%. |
| Key words:
Porous materials, Layered ceramics, Pores/porosity, Microstructure, Strength |
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