Densification, microstructure evolution and mechanical properties of WC doped HfB2-SiC ceramics

Ji Xuan Liu, Guo Jun Zhang, Fang Fang Xu, Wen Wen Wu, Hai Tao Liu, Yoshio Sakka, Toshiyuki Nishimura, Tohru Suzuki, De Wei Ni, Ji Zou

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Despite of good oxidation resistance and ablation resistance, challenge to densify and tendency to loss high temperature (H.T.) strength have limited its potential applications in aerospace for HfB2-SiC ceramic. In this work, dense HfB2-SiC ceramic with improved H.T. flexural strength was prepared using WC as sintering aid. Pure HfB2-SiC ceramic exhibited creep deformation at 1600°C with measured strength value of 389±82MPa, whereas WC doped sample showed much higher flexural strength of 658±69MPa with linear elastic behavior prior to fracture. In addition to clean grain boundary, the addition of 5vol.%WC into HfB2-SiC ceramic promoted the formation of fine (Hf,W)B2, (Hf,W)C and WB precipitates. This combinative effect is responsible for its excellent H.T. mechanical property of WC doped HfB2-SiC ceramic.

Original languageEnglish
Pages (from-to)2707-2714
Number of pages8
JournalJournal of the European Ceramic Society
Volume35
Issue number10
DOIs
Publication statusPublished - 2015 Sep 1
Externally publishedYes

Fingerprint

Densification
Bending strength
Mechanical properties
Microstructure
Oxidation resistance
Ablation
Temperature
Precipitates
Creep
Grain boundaries
Sintering

Keywords

  • Ceramic
  • Hafnium diboride
  • High-temperature properties
  • Sintering
  • UHTCs

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Densification, microstructure evolution and mechanical properties of WC doped HfB2-SiC ceramics. / Liu, Ji Xuan; Zhang, Guo Jun; Xu, Fang Fang; Wu, Wen Wen; Liu, Hai Tao; Sakka, Yoshio; Nishimura, Toshiyuki; Suzuki, Tohru; Ni, De Wei; Zou, Ji.

In: Journal of the European Ceramic Society, Vol. 35, No. 10, 01.09.2015, p. 2707-2714.

Research output: Contribution to journalArticle

Liu, Ji Xuan ; Zhang, Guo Jun ; Xu, Fang Fang ; Wu, Wen Wen ; Liu, Hai Tao ; Sakka, Yoshio ; Nishimura, Toshiyuki ; Suzuki, Tohru ; Ni, De Wei ; Zou, Ji. / Densification, microstructure evolution and mechanical properties of WC doped HfB2-SiC ceramics. In: Journal of the European Ceramic Society. 2015 ; Vol. 35, No. 10. pp. 2707-2714.
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