Thermo – mechanical properties of SPS produced self-healing thermal barrier coatings containing pure and alloyed MoSi2 particles

Justyna Kulczyk-Malecka, Xun Zhang, James Carr, Franck Nozahic, Claude Estournès, Daniel Monceau, Alexandra L. Carabat, Willem G. Sloof, Sybrand van der Zwaag, Philip J. Withers, Ping Xiao

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Yttria – partially stabilised zirconia (YPSZ) MoSi2 composites have been designed to prolong the lifetime of the matrix by self – healing cracks during thermal cycling. The healing reaction at high temperatures is based on the decomposition of MoSi2, leading to a volumetrically expanding reaction product, which seals the crack. In this work, coefficient of thermal expansion (CTE) and the fracture toughness of composites containing MoSi2 particles, produced by spark plasma sintering (SPS) have been compared to conventional YPSZ. The CTE mismatch between YPSZ and MoSi2 was found to be small, implying that thermally induced mismatch stresses will be small and the composites have a similar CTE to conventional YPSZ. Fracture toughness was found not to be affected by the particles and showed similar values to unreinforced YPSZ. Cracks introduced by indentation have been shown neither to prefer, or avoid, the particles suggesting that such a composite system is capable of autonomously activating the self – healing reaction.

Original languageEnglish
Pages (from-to)4268-4275
JournalJournal of the European Ceramic Society
Volume38
Issue number12
DOIs
Publication statusPublished - 2018

Keywords

  • Ceramic composites
  • Life time extension
  • Mechanical properties
  • Self – repairing materials
  • Thermal barrier coatings (TBC)

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