Porosity and pore space characteristics of starch-processed porous ceramics
In the last few years starch has gained remarkable popularity as a pore-forming agent in ceramic technology [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], obviously due to the absence of hygiene and ecological concerns, easy handling and processing (including defect-free burnout), the easy commercial availability in arbitrary amounts, low cost and controlled quality, the rounded shape with well defined aspect ratio (usually close to unity, without large scatter) and the well-defined size distribution for each starch type . Apart from its universal function as a pore-forming agent, starch can serve as a body-forming agent in a new shaping technique called starch consolidation casting (SCC), due to its ability to swell in water at elevated temperatures, thus enabling ceramic green bodies to be fabricated by slip-casting of suspensions with starch into non-porous molds (e.g. metal molds) [16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30].
In this paper we report on new...
KeywordsStarch Percolation Threshold Total Porosity Linear Shrinkage Volumetric Shrinkage
This work was part of the joint project “Characterization of Anisometric Particles and the Microstructure of Heterogeneous Materials” (DAAD and Academy of Sciences of the Czech Republic Grant D2-CZ 21/06-07) and of the research programme “Preparation and Research of Functional Materials and Material Technologies using Micro- and Nanoscopic Methods”, supported by the Ministry of Education, Youth and Sports of the Czech Republic (Grant No. MSM 6046137302). The support is gratefully acknowledged. Further we are indebted to the Almatis GmbH (Germany) and the National Starch & Chemical (UK) for granting free samples of their products.
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