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J. Korean Ceram. Soc. > Volume 51(1); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(1): 19-24.
doi: https://doi.org/10.4191/kcers.2014.51.1.019
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
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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