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

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15 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

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Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Liu, J. X., Zhang, G. J., Xu, F. F., Wu, W. W., Liu, H. T., Sakka, Y., Nishimura, T., Suzuki, T., Ni, D. W., & Zou, J. (2015). Densification, microstructure evolution and mechanical properties of WC doped HfB2-SiC ceramics. Journal of the European Ceramic Society, 35(10), 2707-2714. https://doi.org/10.1016/j.jeurceramsoc.2015.04.009