Effects of thermal exposure on Ir-based alloys with and without Pt coating

Z. B. Bao, H. Murakami, Y. Yamabe-Mitarai

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Isothermal oxidation tests were performed on Ir, Ir-3Hf, Ir/Pt, and Ir-3Hf/Pt in static air at 1100°C for 200h. The microstructural evolution and changes in the composition of the alloys were characterisation by performing scanning electron microscopy (SEM) and field-emission electron probe microanalysis (FE-EPMA). The results indicated that the specimens of all the Ir-based alloys exhibited linear mass loss due to the formation/evaporation of gaseous Ir oxide species (mainly IrO3). The oxidation behaviour, including mass change kinetics, evaporation of gaseous IrO3, and the role of Hf and Pt are discussed.

Original languageEnglish
Pages (from-to)1224-1229
Number of pages6
JournalCorrosion Science
Volume53
Issue number4
DOIs
Publication statusPublished - 2011 Jan 31
Externally publishedYes

Keywords

  • A. Alloy
  • A. Platinum
  • B. EPMA
  • B. Weight loss
  • C. Oxidation

ASJC Scopus subject areas

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

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