Enhanced electrical conductivity of silicon carbide ceramics by addition of graphene nanoplatelets

Benito Román-Manso, Eddy Domingues, Filipe M. Figueiredo*, Manuel Belmonte, Pilar Miranzo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

The paper describes the fabrication by liquid-phase spark plasma sintering (SPS) of composites of dense silicon carbide (SiC) with up to 20vol.% graphene nanoplatelets (GNPs), and discusses the relationships between composition, microstructure and electrical conductivity. The structural integrity of the GNPs is preserved during the whole process, as observed by Raman spectroscopy. The effects of the applied pressure (50MPa) during SPS result in the preferential orientation of the GNPs perpendicular to the pressing axis and anisotropic electrical behaviour. The electrical conductivity measured in the direction perpendicular to the SPS pressing axis is 4 to 6 times higher than the parallel counterpart. The conductivity increases up to three orders of magnitude with increasing GNPs fraction, reaching values of 4380Sm-1 at room temperature for materials with 20vol.% GNPs. The conduction mechanism of the composite is analysed as a function of the GNPs content.

Original languageEnglish (US)
Pages (from-to)2723-2731
Number of pages9
JournalJournal of the European Ceramic Society
Volume35
Issue number10
DOIs
StatePublished - Sep 1 2015

Keywords

  • Composites
  • Electrical conductivity
  • Graphene nanoplatelets
  • SiC
  • Spark plasma sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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