Freeze Cast Porous Mullite Ceramics and Recycling of Coal Fly Ash

Kyu Heon Kim; Seog Young Yoon; Hong Chae Park

doi:10.3740/MRSK.2016.26.2.61

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2016 Vol.26, Issue 2 Next Page

Freeze Cast Porous Mullite Ceramics and Recycling of Coal Fly Ash 동결주조 다공질 뮬라이트 세라믹스의 제조와 석탄회의 재활용

February 2016. pp. 61-66

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Abstract

In order to fabricate porous mullite ceramics with controlled pore structure and improved mechanical strength, a freeze casting route has been processed using camphene mixed with tertiary-butyl alcohol (TBA) and coal fly ash/alumina as the solvent and the ceramic material, respectively. After sintering, the solidification characteristics of camphene and TBA solvent were evident in the pore morphology, i.e., dendritic and straight pore channels formed along the solidification directions of camphene and TBA ice, respectively, after sublimation. Also, the presence of microcracks was observed in the bodies sintered at 1500 °C, mainly due to the difference in solidification volume change between camphene and TBA. The compressive strength of the sintered bodies was found generally to be dependent, in an inverse manner, on the porosity, which was mainly determined by the processing conditions. After sintering at 1300~1500 °C with 30~50 wt% solid loading, the resulting mullite ceramics showed porosity and compressive strength values in ranges of 83.8~43.1% and 3.7~206.8 MPa, respectively.

Keywords

mullite ceramics

camphene

TBA

freeze casting

coal fly ash

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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 : 26
No :2
Pages :61-66
Received Date : 2015-10-02
Revised Date : 2015-12-23
Accepted Date : 2015-12-28
DOI :https://doi.org/10.3740/MRSK.2016.26.2.61

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

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