Texture and microstructure of ZrO2-4mol% Y2 O3 layers obliquely deposited by EB-PVD

Kunihiko Wada, Masato Yoshiya, Norio Yamaguchi, Hideaki Matsubara

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Observing texture and microstructure growth in coating layers during oblique deposition provides the most fundamental information to optimize the process parameters of the deposition process. In this study, the columnar structure of 4 mol% Y2O3 partially stabilized ZrO2 (YSZ) coating layers produced by electron beam physical vapor deposition (EB-PVD) process was experimentally investigated. Most results could be summarized as a function of vapor incident angle (VIA), α. While a mixture of 〈110〉 and 〈111〉 textured columns was observed in the samples deposited at a low α less than 30°, single 〈110〉 textured columns were observed at a high α (> 30°). Therefore, the 〈110〉 was the preferential crystallographic growth direction under oblique deposition. However, the direction of 〈110〉 did not accord with the geometric growth direction of the columns, which is approximately predicted based on so-called the tangent rule. It is likely that the mismatch between these directions results in the formation of feather-like structure, which has been commonly reported. In addition to crystallographic observation, the porosities in the coating layers were investigated. The tendency of the porosity with the change of VIA qualitatively agreed with the previously reported prediction based on the Monte Carlo simulation method.

Original languageEnglish
Pages (from-to)2725-2730
Number of pages6
JournalSurface and Coatings Technology
Volume200
Issue number8
DOIs
Publication statusPublished - 2006 Jan 24

Keywords

  • Electron beam evaporation
  • Monte Carlo simulation
  • Scanning electron microscopy (SEM)
  • Thermal barrier coatings
  • X-ray diffraction
  • Zirconium oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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