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Adhesion of Hydrated Silicate Films

Published online by Cambridge University Press:  25 February 2011

Terry A. Michalské  and
Keith D. Keefer
Terry A. Michalské
Affiliation:
Sandia National Labs., P. O. Box 5800, Albuquerque, NM 87185
Keith D. Keefer
Affiliation:
Sandia National Labs., P. O. Box 5800, Albuquerque, NM 87185
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Abstract

We used fracture mechanics test techniques to measure the adhesive bond energy formed between hydrated silica glass surfaces and silicate species deposited from solution. In the case of silicate surfaces hydrated in room temperature water vapor, intermolecular bonding between hydrated surfaces can be attributed to either hydrogen bonding interactions between adsorbed water molecules (0.15 J/m2) or electrostatic bonds formed between adsorbed cations and anionie-nonbridging surface oxygen groups (2.0 J/m2). The bonding interaction observed at room temperature depends upon the glass surface composition and the degree of surface hydration. When hydrated silicate solution species are added to the interface and heat treated, adhesion energies as large as the cohesive energy of silica glass can be obtained with heat treatments as low as 200 C. The adhesion of the silicate interfacial film produced by the addition of solution species is greatest for silicate precursors showing a low degree of molecular crosslinking. In addition, the presence of alkali in the silicate solution greatly enhances interface adhesion for heat treatments below 200 C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 187
Copyright
Copyright © Materials Research Society 1988

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References

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