期刊
ADVANCES IN APPLIED CERAMICS
卷 110, 期 4, 页码 244-250出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743676111Y.0000000011
关键词
Coal fly ash; TBA; Freeze-gel casting; Porous; Mullite-alumina composite
资金
- Ministry of Knowledge and Economy (MKE) [2008-E-AP-HM-P-04-0000]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2008-E-AP-HM-P-04-0000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A freeze-gel casting method has been proposed to fabricate porous mullite-alumina composite with controlled 'designer' pore structure and improved compressive strength. In this work, a tertiary butyl alcohol-coal fly ash slurry system with appropriate addition of Al2O3 was used. Unidirectional aligned macropore channels were developed by controlling the solidification direction of the tertiary butyl alcohol solvent. Simultaneously, microsized pores formed in the walls of the pore channels; consequently, the inner section of the walls of the pore channels exhibited a more porous structure than the outer walls. The compressive strength of the sintered porous composite increased as the porosity decreased, i.e. the low porosity gave a high compressive strength. After sintering at 1500 degrees C with 40 wt-% solid loading, the mullite-alumina composite with a porosity of 61.2% exhibited a compressive strength of similar to 64.3 MPa.
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