Dense bulk silicon oxycarbide glasses obtained by spark plasma sintering

M. Alejandra Mazo*, Cristina Palencia, Andrés Nistal, Fausto Rubio, Juan Rubio, José Luis Oteo

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Dense silicon oxycarbide glasses (SiOC) have been produced by spark plasma sintering (SPS) of SiOC powders. Raw powders were obtained by pyrolysis under nitrogen at 1100°C of tetraethylorthosilcate/polydimethylsiloxane (TEOS/PDMS) hybrids. SPS experiments were carried out at 1300 and 1500°C at 10 and 80MPa and then were studied by chemical analysis, 29Si and 13C MAS NMR, ATR, Raman, XRD, FE-SEM, density, porosity, microhardness (H v) and thermal conductivity (K). The SiOC materials are formed by Si xOC 4-x units within a silica matrix where silicon carbide and graphite nanodomains are also present. After the SPS treatment the silicon carbide crystallite size is close to 2.5nm. At 1300°C and 1500°C the carbon nanodomain size is close to 3nm and 2nm, respectively. H v values vary from 3.4 to 9.15GPa, for 30% and 1% of porosity, respectively. Finally, K is always close to 1.38Wm -1K -1.

Original languageEnglish
Pages (from-to)3369-3378
Number of pages10
JournalJournal of the European Ceramic Society
Volume32
Issue number12
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Keywords

  • Hardness
  • Nanocomposite
  • Sintering
  • Spark plasma sintering
  • Thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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