Microstructural and phase evolution of spark plasma sintering of graphitized Ti (C0.9N0.1) composites

Ojo Jeremiah Akinribide, Gadifele Nicolene Mekgwe, Babatunde Abiodun Obadele, Olawale Olarewaju Ajibola, Samuel Olukayode Akinwamide, Peter Apata Olubambi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Graphite addition on the particle grain sizes, multiple phases and the ultrafine Ti (C0.9, N0.1) composite produced by means of spark plasma sintering (SPS) was examined by means of X-ray diffractometer (XRD), and scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS). From the results analysed, the presence of graphite increased the porosity of sintered Ti (C0.9, N0.1) cermet and thereby crippled the sinterability of Ti (C0.9, N0.1). Significantly, graphite additions had an influence on particle size, morphology, microstructure and phases of ultrafine Ti (C0.9, N0.1) by inhibiting the dissolution of titanium carbonitride, outer rims phases and the inner rim formation, thereby causing grain growth reduction. Because of depressed dissolution and solution precipitate, graphite phase evolution in the composite has reduced. Furthermore, the presence of graphite improved the micro indentation hardness of Ti (C0.9, N0.1) composite and sintered relative density of the cermets.

Original languageEnglish
Pages (from-to)164-169
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume78
DOIs
Publication statusPublished - Jan 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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