Gel Formation and Drying Characteristics in the Na2O-ZrO2-SiO2 System
Gel formation and drying characteristics in the system aNa2O-bZrO2-(100-a-b) SiO2 (a=0, 7, 13, 18, b=3, 6, 10mol%) were investigated. Gelling time decreased with increasing Na2O content, perhaps due to the catalytic reaction of NaOH released from NaOC2H5. The release of NaOH was confirmed from pH me...
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Veröffentlicht in: | Journal of the Ceramic Society of Japan 1992/07/01, Vol.100(1163), pp.905-911 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng ; jpn |
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Zusammenfassung: | Gel formation and drying characteristics in the system aNa2O-bZrO2-(100-a-b) SiO2 (a=0, 7, 13, 18, b=3, 6, 10mol%) were investigated. Gelling time decreased with increasing Na2O content, perhaps due to the catalytic reaction of NaOH released from NaOC2H5. The release of NaOH was confirmed from pH measurements of sol mixtures with or without water. The weight loss-time curve indicated that the falling rate period decreased with increasing Na2O content, which corresponds to a gel structure with large pore size at high Na2O cocentrations. This was confirmed by measurement of pore size distribution on dried gels. The linear shrinkage of Na2O-containing gels was smaller than that of Na2O free compositions. The tendency of crack formation in gels increased with increasing Na2O content, but decreased with increasing ZrO2 content. It was inferred that this was due to an easy deformable gel structure made up of linear molecules in Na2O-free gels, or to a rigid gel structure made up of particle molecules in Na2O-containing gels. |
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ISSN: | 0914-5400 1882-1022 |
DOI: | 10.2109/jcersj.100.905 |