Degradation of EB-PVD ZrO2-4 mol%Y2O3 thermal barrier coatings by volcanic ash deposits

Byung Koog Jang, Seongwon Kim, Yoon Suk Oh, Sung Min Lee, Hyung Tae Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This work describes the degradation of ZrO2-4 mol%Y2O3 (YSZ) coatings obtained by EB-PVD. YSZ coatings were exposed at 1200°C for 10 min-50 hr by isothermal heat treatment in the presence of an erosive impurity of volcanic ash. At the interface between the YSZ coatings and volcanic ash, the coatings were partially dissolved in the volcanic ash, resulting in the degradation of coatings by the formation of the reacted region. A ZrSiO4 or glassy phase is formed by the chemical reaction between YSZ coatings and volcanic ash at 1200°C. The chemically reacted region from the top surface of the YSZ coatings showed a tendency for increased degradation depth with an increase in isothermal heat-treatment time.

Original languageEnglish
Pages (from-to)886-889
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume124
Issue number9
DOIs
Publication statusPublished - Sep 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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