Oxidation and self-healing behaviour of spark plasma sintered Ta2AlC

Ann Sophie M Farle, Julia Stikkelman, Sybrand van der Zwaag, Willem G. Sloof

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Self-healing and oxidation of spark plasma sintered Ta2AlC was investigated using a newly developed wedge loaded compact specimen to determine strength recovery in a single specimen. Previous work had predicted dominant Al oxidation leading to dense and strong reaction products to result in favourable healing properties. However, crack-gap filling and strength recovery of Ta2AlC were not achieved by oxidation at 600 °C. Oxidation below 900 °C in synthetic and atmospheric air resulted in porous Ta-oxides, with no Al2O3 formation. DTA up to 1200 °C revealed a two-step reaction process with the final products Ta2O5 and TaAlO4. The study shows that the kinetics may overrule the self-healing MAX-phase design criteria based on thermodynamics.

Original languageEnglish
Pages (from-to)1969-1974
JournalJournal of the European Ceramic Society
Volume37
Issue number5
DOIs
Publication statusPublished - 2017

Keywords

  • Oxidation
  • Self-healing
  • Spark plasma sintering
  • TaAlC MAX phase

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