Ultra-high temperature oxidation of a hafnium carbide-based solid solution ceramic composite

David W. Lipke, Sergey V. Ushakov, Alexandra Navrotsky, Wesley P. Hoffman

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Hafnium carbide-based solid solution ceramics with yttria additions were consolidated via hot pressing utilizing chromium carbide as a transient liquid sintering agent. Selected samples were oxidized at temperatures exceeding 2200. °C under high velocity airflow to determine their potential for service in ultra-high temperature environments. Cross-sectional examination revealed a complex multi-layer scale comprising a highly porous exterior region, a dense multi-phase interior region, and an oxygen- and carbon-containing interlayer consisting of nanocrystalline graphite in an amorphous or nanocrystalline oxide matrix. Outward diffusion of mobile cations is speculated to play an important role in establishing the observed scale morphology.

Original languageEnglish (US)
Pages (from-to)402-407
Number of pages6
JournalCorrosion Science
Volume80
DOIs
StatePublished - Mar 2014
Externally publishedYes

Keywords

  • A. Ceramic
  • C. High temperature corrosion
  • C. Oxidation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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