Effects of discrete and simultaneous addition of SiC and Si3N4 on microstructural development of TiB2 ceramics

Van Huy Nguyen*, Seyed Ali Delbari, Zohre Ahmadi, Abbas Sabahi Namini*, Quyet Van Le*, Mohammadreza Shokouhimehr, Mehdi Shahedi Asl*, Mohsen Mohammadi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The impact of Si3N4 and SiC additives incorporation in the microstructure and sintering behavior of TiB2-based composites were studied. Three ceramic composites including TiB2–Si3N4, TiB2–SiC, and TiB2–SiC–Si3N4 were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffractometry and scanning electron microscopy. In addition, the sintering thermodynamic was investigated using the HSC Chemistry package. X-ray diffraction patterns of the prepared ceramics revealed the in-situ formation of graphite and boron nitride in the final composites initiated from SiC and Si3N4, respectively. The thermodynamic assessments proved the role of liquid phase sintering on the sinterability enhancement of all composite samples. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy verified the in-situ formation of both BN and graphite components in the sample containing SiC and Si3N4 additives. Finally, the fractographical investigations clarified the transgranular breakage as the main fracture mode in the TiB2-based ceramics.

Original languageEnglish
Pages (from-to)3520-3528
Number of pages9
JournalCeramics International
Volume47
Issue number3
DOIs
Publication statusPublished - 1 Feb 2021
Externally publishedYes

Keywords

  • Microstructure
  • SiN
  • SiC
  • Spark plasma sintering
  • TiB
  • UHTCs

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