Origins of high fracture toughness and glass-like thermal conductivity in Zr–Ta–O composites

Lin Chen, Baihui Li, Keren Luo, Hao Xu, Mingyu Hu*, Hongxia Li, Gang Wang, Shixian Zhao, Jing Feng*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

4 Citations (Scopus)

Abstract

Screening multifunctional thermal/environmental barrier coatings (T/EBCs) for ceramic matrix composites (CMCs) and alloys contribute to developing highly efficient hypersonic vehicles and aeroengines. This work elucidates that Zr–Ta–O composites are T/EBCs for Al2O3 fiber-reinforced Al2O3 (Al2O3f/Al2O3) CMCs and alloys. Zr–Ta–O composites have superiorities of glass-like thermal conductivity (1.4 W m–1 K–1), thermal expansion coefficients (8.6–12.3 × 10–6 K–1) matching to Al2O3f/Al2O3 and alloys, and high toughness (3.4 MPa m1/2). The origins of high toughness are elucidated from crack-propagation models and formation of micro-cracks, which consume lots of crack fracture energy and relieve the stress concentration of indentation tips. The long-range-ordered and short-range-disordered arrangements of cations and the highly twisting lattices of Ta2Zr6O17 significantly contribute to their glass-like thermal conductivity. This work motivates upcoming study and application of Zr–Ta–O composites as T/EBCs with working temperature reaching 1500°C.

Original languageEnglish
Pages (from-to)6508-6516
Number of pages9
JournalJournal of the American Ceramic Society
Volume105
Issue number11
Early online date12 Jun 2022
DOIs
Publication statusPublished - Nov 2022

Scopus Subject Areas

  • Ceramics and Composites
  • Materials Chemistry

User-Defined Keywords

  • fracture toughness
  • microstructures
  • nano-indentation
  • T/EBCs
  • thermal conductivity

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