Fabrication of High Porous Ceramic with Mullite Whisker from Fly Ash

Cheol Shin; Kwang-Taek Hwang; Ung-Soo Kim; Kyu-Sung Han; Jung-Hoon Choi; Jin-Ho Kim

doi:10.3740/MRSK.2022.32.5.258

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Fabrication of High Porous Ceramic with Mullite Whisker from Fly Ash 석탄재를 이용한 뮬라이트 휘스커 고다공성 세라믹 제작

May 2022. pp. 258-263

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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

MoO₃

porous ceramic

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 32
No :5
Pages :258-263
Received Date : 2022-03-04
Revised Date : 2022-04-19
Accepted Date : 2022-04-19
DOI :https://doi.org/10.3740/MRSK.2022.32.5.258

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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