Microstructural evolution during spark plasma sintering of TiC–AlN–graphene ceramics

Van Huy Nguyen*, Mehdi Shahedi Asl, Seyed Ali Delbari, Quyet Van Le, Abbas Sabahi Namini, Joo Hwan Cha, Sea Hoon Lee, Ho Won Jang, Mazli Mustapha, Mohsen Mohammadi, Mohammadreza Shokouhimehr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This examination intended to evaluate the synergic influence of graphene nano-platelets (GNPs) and AlN on the microstructure and consolidation behavior of TiC. The spark plasma sintering (SPS) method was employed as the manufacturing process under the sintering circumstances of 40 MPa, 10 min, and 1900 °C. The simultaneous incorporation of AlN and GNPs could improve the relative density of TiC more than 4%, reaching a fully dense ceramic. According to the X-ray diffraction (XRD) spectrum, thermodynamic study, as well as the microstructural assessments, i.e., scanning electron microscopy (SEM), Electron probe micro-analyzer (EPMA), scanning transmission electron microscopy (STEM) and transmission electron microscopy (TEM), the TiN and Al2OC ingredients were produced over the SPS process as the in-situ phases. Although Al2OC remained in the microstructure as an amorphous-like phase, the in-situ produced TiN dissolved into the TiC matrix, creating a Ti(C,N) solid solution. A chemical reaction between AlN and the surface oxide of TiC, namely TiO2, was found to be responsible for the in-situ generation of the TiN compound. Thanks to the formation of the solid solution, strong interfaces were created amongst the matrix grains, promoting the transgranular fracture mode. Moreover, some dislocations and distorted atomic planes were seen in the microstructure, derived from the thermal expansion coefficients' inconsistency between the different phases over the cooling stage.

Original languageEnglish
Article number105496
JournalInternational Journal of Refractory Metals and Hard Materials
Volume96
DOIs
Publication statusPublished - Apr 2021
Externally publishedYes

Keywords

  • AlN
  • Graphene
  • Microstructure
  • SPS
  • TiC
  • UHTCs

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