Highly Electrically Conducting Glass-Graphene Nanoplatelets Hybrid Coatings

E. Garcia, A. Nistal, A. Khalifa, Y. Essa, F. Martín De La Escalera, M. I. Osendi, P. Miranzo*

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Hybrid coatings consisting of a heat resistant Y2O3-Al2O3-SiO2 (YAS) glass containing 2.3 wt % of graphene nanoplatelets (GNPs) were developed by flame spraying homogeneous ceramic powders-GNP granules. Around 40% of the GNPs survived the high spraying temperatures and were distributed along the splat-interfaces, forming a percolated network. These YAS-GNP coatings are potentially interesting in thermal protection systems and electromagnetic interference shields for aerospace applications; therefore silicon carbide (SiC) materials at the forefront of those applications were employed as substrates. Whereas the YAS coatings are nonconductive, the YAS-GNP coatings showed in-plane electrical conductivity (∼102 S·m-1) for which a low percolation limit (below 3.6 vol %) is inferred. Indentation tests revealed the formation of a highly damaged indentation zone showing multiple shear displacements between adjacent splats probably favored by the graphene sheets location. The indentation radial cracks typically found in brittle glass coatings are not detected in the hybrid coatings that are also more compliant.

Original languageEnglish
Pages (from-to)17656-17662
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number32
Early online date29 Jul 2015
DOIs
Publication statusPublished - 19 Aug 2015
Externally publishedYes

Keywords

  • electrical conductivity
  • electromagnetic interference shielding
  • graphene nanoplatelets
  • heat resistant glass
  • hybrid coatings
  • strain tolerance
  • thermal protection
  • thermal spraying

ASJC Scopus subject areas

  • Materials Science(all)

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