Structure and energetics of SiOC and SiOC-modified carbon-bonded carbon fiber composites

Min Niu, Hongjie Wang, Jiewei Chen, Lei Su, Di Wu, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The incorporation of SiOC polymer-derived ceramics into porous carbon materials could provide tailored shapeable, mechanical, electrical, and oxidation-resistant properties for high-temperature applications. Understanding the thermodynamic and kinetic stability of such materials is crucial for their practical application. We report here the dependence of structures and energetics of SiOC and SiOC-modified carbon-bonded carbon fiber composites (CBCFs) on the pyrolysis temperature using spectroscopic methods and high-temperature oxide melt solution calorimetry. The results indicate that a SiOC ceramic pyrolyzed at 1200°C and 1600°C is energetically stable with respect to an isocompositional mixture of cristobalite, silicon carbide, and graphite by 4.9 and 10.3 kJ/mol, respectively, and more energetically stable than that pyrolyzed at 1450°C. Their thermodynamic stability is related to their structural evolution. SiOC-modified CBCFs become energetically less stable with increasing preparation temperature and concomitant increase in excess carbon content.

Original languageEnglish (US)
Pages (from-to)3693-3702
Number of pages10
JournalJournal of the American Ceramic Society
Volume100
Issue number8
DOIs
StatePublished - Aug 2017
Externally publishedYes

Keywords

  • silicon oxycarbide
  • structure
  • thermodynamics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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