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Journal of Materials Science

, Volume 16, Issue 7, pp 1980–1988 | Cite as

Conversion of monolithic gels to glasses in a multicomponent silicate glass system

  • C. J. Brinker
  • S. P. Mukherjee
Papers

Abstract

Multicomponent silicate glasses of composition (wt%) 66SiO2-18B2O3-7Al2O3-6Na2O-3BaO were prepared by three sol-gel processes which differed primarily in the extent of hydrolysis of the metal alkoxide precursors. Gels which were prepared from solutions in which a stoichiometric excess of water was added, causing extensive replacement of OR groups (R ≡ (C x H(2x+1))s−1 by hydroxyl groups, were converted to fully dense, organic-free, monolithic glasses at temperatures near the glass transition temperature. Gels containing large numbers of OR groups showed enhanced densification at lower temperatures due to condensation reactions, but these gels could not be converted to fully dense, organic-free glasses. This investigation has shown that at least three possible densification mechanisms might be operative during the gel to glass conversion: volume relaxation, condensation reactions and viscous sintering.

Keywords

Hydrolysis Glass Transition Glass Transition Temperature Alkoxide Condensation Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1981

Authors and Affiliations

  • C. J. Brinker
    • 1
  • S. P. Mukherjee
    • 2
  1. 1.Sandia National LaboratoriesAlbuquerqueUSA
  2. 2.Battelle Columbus LaboratoriesColumbusUSA

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