High-strength TiB2-TaC ceramic composites prepared using reactive spark plasma consolidation

Dmytro Demirskyi, Toshiyuki Nishimura, Yoshio Sakka, Oleg Vasylkiv

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

This study demonstrates that reactive consolidation achieved via spark plasma sintering (SPS) is an effective strategy to enhance the high-temperature flexural strength of TiB2-based ceramics. Monolithic ceramics of TaC and TiB2 were consolidated by non-reactive SPS and were used as reference samples. The microstructural development during room- and high-temperature strength tests was analyzed. The room-temperature strength of TiB2 ceramics was analyzed as a function of the grain size. The high-temperature strength and associated microstructural development of monolithic TaC ceramics are reported for the first time. The TiB2-TaC ceramic system was then consolidated by reactive SPS at 2000 °C. The flexural strength of the 10 wt% TaC-TiB2 ceramic composites reached 533 MPa at room temperature and 480 MPa at 1600 °C. The development of the (Ti,Ta)(C,B) phase was considered the main reason for the preservation of the high strength up to 1600 °C. Both bulk TaC and TiB2 exhibited drastic decreases in their bending strengths at 1600 °C because of the activation of plastic deformation associated with high-temperature creep, and their strength did not exceed 210 MPa.

Original languageEnglish
Pages (from-to)1298-1306
Number of pages9
JournalCeramics International
Volume42
Issue number1
DOIs
Publication statusPublished - 2016 Jan
Externally publishedYes

Keywords

  • High-temperature flexural strength
  • Reaction sintering
  • Spark plasma sintering
  • TaC
  • TiB

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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