Columnar and DVC-structured thermal barrier coatings deposited by suspension plasma spray: high-temperature stability and their corrosion resistance to the molten salt

Xiaolong Chen, Takuma Ohnuki, Seiji Kuroda, Maciej Gizynski, Hiroshi Araki, Hideyuki Murakami, Makoto Watanabe, Yoshio Sakka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

High-temperature stability of SPS YSZ coatings with the columnar and deep vertically cracked (DVC) structures and their corrosion resistance to 56 wt% V2O5+44 wt% Na2SO4 molten salt mixture were investigated. Both the columnar and DVC-structured YSZ coatings were sintered at 1000 °C, but a significant increase in porosity in combination with significant reductions in Vickers’ hardness and Young's modulus were observed at the temperatures from 1200 °C to 1400 °C. The DVC-structured YSZ coating exhibited superior corrosion resistance against the molten salt mixture attack to the columnar-structured one due to its higher density behaving as a sealing protective top layer at 950 °C.

Original languageEnglish
Pages (from-to)16822-16832
Number of pages11
JournalCeramics International
Volume42
Issue number15
DOIs
Publication statusPublished - 2016 Nov 15
Externally publishedYes

Keywords

  • Corrosion
  • Plasma spraying
  • Suspension
  • Thermal barrier coating
  • YSZ

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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