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

Dmytro Demirskyi, Toshiyuki Nishimura, Yoshio Sakka, Oleg Vasylkiv

研究成果: Article査読

37 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1298-1306
ページ数9
ジャーナルCeramics International
42
1
DOI
出版ステータスPublished - 2016 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • プロセス化学およびプロセス工学
  • 表面、皮膜および薄膜
  • 材料化学

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