Inhibited grain growth in hydroxyapatite-graphene nanocomposites during high temperature treatment and their enhanced mechanical properties

Yi Liu, Jing Huang, Mitsuo Niinomi, Hua Li

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Nanostructured hydroxyapatite (HA)-graphene nanosheet (GN) composites have been fabricated by spark plasma sintering consolidation. Nanostructual evolution of the bioceramic-based composites during further high temperature heat treatment is characterized and enhanced mechanical strength is assessed. GN keeps intact after the treatment and its presence at HA grain boundaries effectively inhibits HA grain growth by impeding interconnection of individual HA grains. Microstructural characterization discloses strong coherent interfaces between GN and the (300) plane of HA crystals. This particular matching state in the composites agrees well with the competitive theoretical pull-out energy for single graphene sheet being departed from HA matrix. The toughening regimes that operate in HA-GN composites at high temperatures give clear insight into potential applications of GN for ceramic matrix composites.

Original languageEnglish
Pages (from-to)11248-11255
Number of pages8
JournalCeramics International
Volume42
Issue number9
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • Annealing
  • Ceramic matrix composites
  • Grain growth
  • Graphene nanosheet
  • Hydroxyapatite
  • Interfaces

ASJC Scopus subject areas

  • Ceramics and Composites
  • Process Chemistry and Technology
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry

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