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J. Korean Ceram. Soc. > Volume 50(2); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(2): 93.
doi: https://doi.org/10.4191/kcers.2013.50.2.093
Processing of Porous Ceramics by Direct Foaming: A Review
Ashish Pokhrel, Dong Nam Seo, Seung Taek Lee, Ik Jin Kim
Institute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University
ABSTRACT
Macro porous ceramics possessing controlled microstructures and chemical compositions have increasingly proven useful in the industrial sphere. Their sintered structures have found application in both established and emerging, areas such as thermal insulation in buildings, filtration of liquids and molten materials, refractory insulation, bone scaffolds and tissue engineering. Stable ceramic foams can be formed by wet chemical methods using inorganic particles(e.g., $Al_2O_3$ or $SiO_2$). The wet foams are dried and sintered with improved porosity and mechanical properties. This review examines the different techniques used to prepare porous ceramics from ceramic foams, focusing on the explanation of this versatile method of direct foaming from the past to the present. Comparisons of the processes and the processing parameters are explained with the produced microstructures.
Key words: Porous ceramics, Direct foaming, In-situ hydrophobization, Wet foam stability
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