Microstructural characterization and mechanical behaviours of TiN-graphite composites fabricated by spark plasma sintering

Ojo Jeremiah Akinribide, Babatunde Abiodun Obadele, Samuel Olukayode Akinwamide, Olusola Olaitan Ayeleru, Mehdi Eizadjou, Simon P. Ringer, Peter Apata Olubambi

Research output: Contribution to journalArticle

Abstract

The effects of milling time on the particle size distribution (PSD), densification, microstructure, hardness and fracture toughness of spark plasma sintered (SPS) TiN+graphite ceramic were studied. TiN with varying amount of graphite (1, 3, and 5 wt%) were milled at different milling time (8, 24 and 40 h), thereafter sintered at sintering temperature of 1800 °C, holding time of 10 min and pressure of 50 MPa. The relative density and hardness increased as milling time progressed from 24 to 40 h, however, the relative density, hardness, and particle size decreased after 8 h of milling. The microstructural analyses showed that a fully sintered TiN+graphite compact could be achieved at sintering temperature of 1800 °C, with no significant grain growth. Residual stress effect of TiN+5 wt% graphite composite was analyzed using XRD method and the result indicated that there is no significant residual stress on the sample. The relative density, Vickers hardness and fracture toughness of TiN+ 1 wt% Gr, milled for 40 h were 99.24%, 13.90 GPa and 4.0 MPa.m1/2 respectively.

Original languageEnglish
Article number105253
Number of pages13
JournalInternational Journal of Refractory Metals and Hard Materials
Volume91
DOIs
Publication statusPublished - Sep 2020

All Science Journal Classification (ASJC) codes

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

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