(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics with low thermal conductivity

Xueliang Yan, Loic Constantin, Yongfeng Lu, Jean François Silvain, Michael Nastasi, Bai Cui

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

A novel high-entropy carbide ceramic, (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C, with a single-phase rock salt structure, was synthesized by spark plasma sintering. X-ray diffraction confirmed the formation of a single-phase rock salt structure at 26-1140°C in Argon atmosphere, in which the 5 metal elements may share a cation position while the C element occupies the anion position. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C exhibits a much lower thermal diffusivity and conductivity than the binary carbides HfC, ZrC, TaC, and TiC, which may result from the significant phonon scattering at its distorted anion sublattice. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C inherits the high elastic modulus and hardness of the binary carbide ceramics.

Original languageEnglish (US)
Pages (from-to)4486-4491
Number of pages6
JournalJournal of the American Ceramic Society
Volume101
Issue number10
DOIs
StatePublished - Oct 2018

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Keywords

  • high-entropy ceramics
  • microstructure
  • spark plasma sintering
  • thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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