Thermal cycle resistance of yttria stabilized zirconia coatings prepared by MO-CVD

Rong Tu, Takashi Goto

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Yttria stabilized zirconia (YSZ) coatings containing 0 to 9.5 mol% Y 2O3 were prepared on Hastelloy-XR alloys by metal-organic chemical vapor deposition (MO-CVD), and the effect of Y2O 3 content on thermal cycle resistance was investigated in the temperature intervals from 600 to 1273 K and from 600 to 1373 K in air. In the 600-1273 K interval, delamination after 1200 cycles had not occurred for any of the Y2O3 contents of YSZ coatings. In the 600-1373 K interval, the YSZ coatings containing 0, 0.5 and 9.5 mol% Y2O 3 suffered partial delamination after 1200 cycles, while no delamination was observed for the YSZ coatings containing 4 mol% Y 2O3. During the thermal cycles, thermally grown oxide (TOO) layers consisting of inner Cr2O3 and outer (Ni,Mn,Fe)(Fe,Cr)2O4 spinel were formed at the YSZ coating/Hastelloy-XR substrate alloy interface. The delamination of YSZ coatings occurred at the alloy side near the TOO layer/Hastelloy-XR alloy interface.

Original languageEnglish
Pages (from-to)1318-1323
Number of pages6
JournalMaterials Transactions
Volume46
Issue number6
DOIs
Publication statusPublished - 2005 Jun

Keywords

  • Hastelloy-XR alloy
  • Metal-organic chemical vapor deposition (MO-CVD)
  • Thermal cycle resistance
  • Thermally grown oxide (TGO) layer
  • Yttria stabilized zirconia (YSZ) coatings

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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