Characterization of ZrB2–TiC composites reinforced with short carbon fibers

Hamid Istgaldi, Behzad Nayebi*, Zohre Ahmadi, Peyman Shahi, Mehdi Shahedi Asl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Solid solution formation, phase evolution, microstructure development, and mechanical behavior of ZrB2–TiC composites with/without carbon fiber additive were investigated. Fully dense composites were manufactured by spark plasma sintering route under 40 MPa load at 1900 °C for 420 s. FESEM and XRD studies were carried out to unveil the densification and toughening mechanisms in the sintered specimens. Results showed that the addition of only 1 wt% short carbon fibers increased the hardness from 21.8 GPa to 23.5 GPa. Moreover, a 3 % enhancement in the indentation fracture toughness was also observed due to the incorporation of short carbon fibers. The in-situ formation of ZrC and TiB2 phases were identified and related to a chemical reaction between the ZrB2 and TiC constituents. The solid solution development between the ZrB2 matrix and the in-situ formed TiB2 was also proved by the microstructural observation and the shifted peaks of ZrB2 in the XRD patterns.

Original languageEnglish
Pages (from-to)23155-23164
Number of pages10
JournalCeramics International
Volume46
Issue number14
DOIs
Publication statusPublished - 1 Oct 2020
Externally publishedYes

Keywords

  • Carbon fiber
  • Solid solution
  • Spark plasma sintering
  • ZrB–TiC

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