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

doi:10.1016/j.jeurceramsoc.2017.10.026

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

University of Nottingham

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

70 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 language	English
Pages (from-to)	1878-1887
Number of pages	10
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	4
Early online date	17 Oct 2017
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.10.026
Publication status	Published - 1 Apr 2018
Externally published	Yes

Bibliographical note

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

Funding

This work was supported by the Engineering and Physical Sciences Research Council [grant number EP/M01536X/1 ]. The authors would like to thank Dr. Chun Li from the University of Manchester for the helpful discussion on crystallography and Mr. Rory Screaton for the experimental assistance.

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

Access to Document

10.1016/j.jeurceramsoc.2017.10.026Licence: CC BY

PublishedFinal published version, 4.67 MBLicence: CC BY

Cite this

@article{b191b3fba96a4f20b203d5810e9470a3,

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

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.",

keywords = "Microstructure, Phase stability, Suspension high velocity oxy fuel (SHVOF), Suspension medium, Yttria-stabilised zirconia (YSZ)",

author = "M. Bai and H. Maher and Z. Pala and T. Hussain",

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

year = "2018",

month = apr,

day = "1",

doi = "10.1016/j.jeurceramsoc.2017.10.026",

language = "English",

volume = "38",

pages = "1878--1887",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier B.V.",

number = "4",

}

TY - JOUR

T1 - Microstructure and phase stability of suspension high velocity oxy-fuel sprayed yttria stabilised zirconia coatings from aqueous and ethanol based suspensions

AU - Bai, M.

AU - Maher, H.

AU - Pala, Z.

AU - Hussain, T.

N1 - This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).T

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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.

AB - 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.

KW - Microstructure

KW - Phase stability

KW - Suspension high velocity oxy fuel (SHVOF)

KW - Suspension medium

KW - Yttria-stabilised zirconia (YSZ)

UR - https://www.scopus.com/pages/publications/85031773772

U2 - 10.1016/j.jeurceramsoc.2017.10.026

DO - 10.1016/j.jeurceramsoc.2017.10.026

M3 - Article

AN - SCOPUS:85031773772

SN - 0955-2219

VL - 38

SP - 1878

EP - 1887

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 4

ER -

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

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this