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http://dx.doi.org/10.4191/kcers.2014.51.1.019

Porous Alumina/Mullite Layered Composites with Unidirectional Pore Channels and Improved Compressive Strength  

Kim, Kyu Heon (School of Materials Science and Engineering, Pusan National University)
Kim, Tae Rim (School of Materials Science and Engineering, Pusan National University)
Kim, Dong Hyun (School of Materials Science and Engineering, Pusan National University)
Yoon, Seog Young (School of Materials Science and Engineering, Pusan National University)
Park, Hong Chae (School of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.1, 2014 , pp. 19-24 More about this Journal
Abstract
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%.
Keywords
Porous materials; Layered ceramics; Pores/porosity; Microstructure; Strength;
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Times Cited By KSCI : 3  (Citation Analysis)
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