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Physical Properties of Dried Na2O-SiO2 Monoliths

Published online by Cambridge University Press:  25 February 2011

Rounan Li  and
L. L. Hench
Rounan Li
Affiliation:
Advanced Materials Research Center, University of Florida, One Progress Blvd., #14, Alachua, FL 32615
L. L. Hench
Affiliation:
Advanced Materials Research Center, University of Florida, One Progress Blvd., #14, Alachua, FL 32615
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Abstract

Dried monolithic gels of compositions XNa2O-(1-X)SiO2 (with X from 0 mol% to 7 mol%) were obtained by acid catalyzed sol-gel processing using tetramethylorthosilicate and NaNO3. Optically clear monoliths in the range of 20 to 90 mm diameter by 3 to 20 mm thickness were routinely produced by controlling the processing schedule. Complete drying in air without cracking was achieved at 180°C from 10–14 days. The bulk density and optical properties of the gels, characterized by UV/VIS/NIR transmission, IR reflection and index of refraction, showed a compositional dependence on Na2O similar to melt glasses of the same Na2O content. However, the true density and microhardness decreased with Na2O content in contrast to melt glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 589
Copyright
Copyright © Materials Research Society 1988

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References

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