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http://dx.doi.org/10.3740/MRSK.2022.32.5.258

Fabrication of High Porous Ceramic with Mullite Whisker from Fly Ash  

Shin, Cheol (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Hwang, Kwang-Taek (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Kim, Ung-Soo (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Han, Kyu-Sung (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Choi, Jung-Hoon (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Kim, Jin-Ho (Ceramic Ware Materials Center, Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Korean Journal of Materials Research / v.32, no.5, 2022 , pp. 258-263 More about this Journal
Abstract
Porous ceramics have the advantages of low density, low thermal conductivity, and excellent mechanical properties. Among porous ceramic manufacturing methods, the replica template method allows the easy manufacturing of porous filters with the highest porosity and pores of the desired size, but it also has the disadvantage that the resulting filters have low mechanical strength. To overcome this shortcoming, mullite (3Al2O3·2SiO2) whiskers, which have excellent thermal stability and high mechanical strength, were introduced in porous ceramic structure. The mullite whiskers were synthesized using a composition of Al2O3, flyash and MoO3. The morphologies and crystal structures of the mullite whiskers with MoO3 contents were investigated in detail. When the porous ceramic with mullite whiskers was fabricated using 20 wt% MoO3 catalyst the most uniform microstructure was obtained, and the mullite whiskers showed the highest aspect ratio of 47.03. The porosity and compressive strength of the fabricated porous ceramic were 82.12 % and 0.83 MPa, respectively.
Keywords
fly ash; mullite whiskers; $MoO_3$; porous ceramic;
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