Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Porous Alumina/Mullite Layered Composites with Unidirectional Pore Channels and Improved Compressive Strength

일축배향 기공채널과 향상된 압축강도를 갖는 다공질 알루미나/뮬라이트 층상 복합체

  • 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)
  • Received : 2014.01.06
  • Accepted : 2014.01.20
  • Published : 2014.01.31
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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

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