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

Bai, Mingwen; Maher, Harry; Pala, Zdenek; Hussain, Tanvir

Authors

Mingwen Bai

Harry Maher

Zdenek Pala zdenek.pala@nottingham.ac.uk



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.

Citation

Bai, M., Maher, H., Pala, Z., & Hussain, T. (in press). Microstructure and phase stability of suspension high velocity oxy-fuel sprayed yttria stabilised zirconia coatings from aqueous and ethanol based suspensions. Journal of the European Ceramic Society, 38(4), https://doi.org/10.1016/j.jeurceramsoc.2017.10.026

Journal Article Type Article
Acceptance Date Oct 14, 2017
Online Publication Date Oct 16, 2017
Deposit Date Oct 18, 2017
Publicly Available Date Oct 18, 2017
Journal Journal of the European Ceramic Society
Print ISSN 0955-2219
Electronic ISSN 1873-619X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 38
Issue 4
DOI https://doi.org/10.1016/j.jeurceramsoc.2017.10.026
Keywords Suspension high velocity oxy fuel (SHVOF); Yttria-stabilized zirconia (YSZ); Suspension medium; Microstructure; Phase stability
Public URL http://eprints.nottingham.ac.uk/id/eprint/47370
Publisher URL http://www.sciencedirect.com/science/article/pii/S0955221917307045
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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