Development of porous ceramic layers through sublimation of metal phases in multiphase alloys

Nobuaki Sekido, Yoko Mitarai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Here described is a procedure for the fabrication of porous ceramic layers onto metallic substrates. Porous ceramic layers with submicron sized pores can readily develop by taking advantage of eutectic solidification and sublimation of a metallic phase upon high temperature exposure. The material in the present study is based on the Ir-Y system, where two-phase microstructures comprised of Ir and Ir3Y are formed through solidification process. A eutectic solidification yields submicron-scaled Ir particles within the Ir3Y matrix. Upon air-exposure at 1373 K, the Ir phase forms volatile oxides and the Ir3Y phase transforms into Y2Ir2O7, by which porous ceramic layers develop on the surface of the base materials.

Original languageEnglish
Pages (from-to)907-911
Number of pages5
JournalInternational Journal of Refractory Metals and Hard Materials
Volume27
Issue number5
DOIs
Publication statusPublished - 2009 Sep 1
Externally publishedYes

Keywords

  • Eutectic solidification
  • Iridium oxides
  • Porous oxides
  • YIrO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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