Chemical durability of silicon oxycarbide glasses

Gian Domenico Sorarù, Stefano Modena, Emanuel Guadagnino, Paolo Colombo, James Egan, Carlo Pantano

Research output: Contribution to journalArticle

179 Scopus citations

Abstract

Silicon oxycarbide (SiOC) glasses with controlled amounts of Si-C bonds and free carbon have been produced via the pyrolysis of suitable preceramic networks. Their chemical durability in alkaline and hydrofluoric solutions has been studied and related to the network structure and microstructure of the glasses. SiOC glasses, because of the character of the Si-C bonds, exhibit greater chemical durability in both environments, compared with silica glass. Microphase separation into silicon carbide (SiC), silica (SiO2), and carbon, which usually occurs in this system at pyrolysis temperatures of > 1000°-1200°C, exerts great influence on the durability of these glasses. The chemical durability decreases as the amount of phase separation increases, because the silica/silicate species (without any carbon substituents) are interconnected and can be easily leached out, in comparison with the SiOC phase, which is resistant to attack by OH- or F- ions.

Original languageEnglish (US)
Pages (from-to)1529-1536
Number of pages8
JournalJournal of the American Ceramic Society
Volume85
Issue number6
DOIs
StatePublished - Jun 2002

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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