A microstructural approach to the chemical reactions during the spark plasma sintering of novel TiC–BN ceramics

Shahrzad Shaddel, Abbas Sabahi Namini, Yaghoub Pazhouhanfar, Seyed Ali Delbari, Mehdi Fattahi*, Mehdi Shahedi Asl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

In this work, the monolithic TiC and h-BN doped ceramics were spark plasma sintered at 1900 °C for 10 min under 40 MPa pressure. The sinterability and physical-mechanical qualifications of as-produced specimens were studied to assess the impacts of the h-BN additive on TiC-based composites. Adding h-BN did not have any evident effect on the relative density so that both series of specimens achieved the same values around 95%. The X-ray diffraction (XRD) and microstructural evaluations proved the in-situ generation of TiB, TiB2, TiC and C phases. Although the monolithic TiC samples reached an average hardness of 3128 HV100 g, this value decreased by ~7% when h-BN was added to TiC. Finally, the monolithic sample showed a higher flexural strength (504 MPa) compared with the doped sample (429 MPa).

Original languageEnglish
Pages (from-to)15982-15990
Number of pages9
JournalCeramics International
Volume46
Issue number10
DOIs
Publication statusPublished - Jul 2020
Externally publishedYes

Keywords

  • Characterization
  • Chemical reaction
  • h-BN
  • Spark plasma sintering
  • TiC

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