Microstructure and phase stability of suspension high velocity oxy-fuel sprayed yttria stabilised zirconia coatings from aqueous and ethanol based suspensions

M. Bai, H. Maher, Z. Pala, T. Hussain

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)
26 Downloads (Pure)

Abstract

Two commercial 7–8 wt.% Yttria Stabilised Zirconia (YSZ) suspensions were sprayed by Suspension High Velocity Oxy Fuel (SHVOF) thermal spraying for advanced high temperature coatings. Heat treatments of the free-standing coatings were conducted at 800 °C and 1000 °C for 72 h. The SHVOF coatings using two liquid carriers: water and ethanol, behaved differently in terms of micro-structure and phase stability. The ethanol coatings retained a fully tetragonal composition after heat treatments; while the aqueous coatings, however, underwent the undesirable tetragonal to monoclinic phase transformation at 1000 °C, which is lower than previously reported temperatures (>1200 °C) in thermal sprayed YSZ coatings. The heat treatments not only resulted in densification of both coatings, but also caused excessive crystallite growth in aqueous coatings promoting the undesirable phase transformation. On the contrary, the ethanol suspension improved the phase stability by favouring the homogenization of yttrium during spraying.

Original languageEnglish
Pages (from-to)1878-1887
Number of pages10
JournalJournal of the European Ceramic Society
Volume38
Issue number4
Early online date17 Oct 2017
DOIs
Publication statusPublished - 1 Apr 2018
Externally publishedYes

Bibliographical note

This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).T

Keywords

  • Microstructure
  • Phase stability
  • Suspension high velocity oxy fuel (SHVOF)
  • Suspension medium
  • Yttria-stabilised zirconia (YSZ)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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