FABRICATION OF POROUS ALUMINA CERAMICS WITH CORN STARCH IN AN EASY AND LOW-COST WAY
Porous alumina ceramics with different porosity were fabricated by combining the starch consolidation process with the gel-casting process using corn starch as a pore-forming agent and a binder. The bulk density, porosity, and microstructure of the obtained alumina ceramics were studied. It was foun...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2015-12-01
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| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: |
http://www.ceramics-silikaty.cz/2015/pdf/2015_04_348.pdf
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| Summary: | Porous alumina ceramics with different porosity were fabricated by combining the starch consolidation process with the
gel-casting process using corn starch as a pore-forming agent and a binder. The bulk density, porosity, and microstructure
of the obtained alumina ceramics were studied. It was found that the total porosity range of sintered samples with contents
varying from 0 to 50 vol. % is 14.8 - 55.3 % and the total porosity increased with the increase of starch content. Moreover,
a relationship between the total porosity of alumina ceramics after sintering and corn starch content was obtained. This
relationship indicates that the total porosity of alumina ceramics fabricated in this work was higher than that of the ceramics
made by traditional slip-casting. The range of total porosity of ceramics in this work was broader than that of the ceramics
produced by starch consolidation casting. The relation between the linear shrinkage of porous alumina ceramics and the
starch content also was discussed. The compressive strength of the sintered samples varied within the range of 5 - 24 MPa,
corresponding to starch content of 50 - 10 vol. %. |
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| ISSN: | 0862-5468 1804-5847 |