Plasma-sprayed La2Ce2O7 thermal barrier coatings against calcium-magnesium-alumina-silicate penetration

Lihua Gao; Hongbo Guo; Shengkai Gong; Huibin Xu

doi:10.1016/j.jeurceramsoc.2014.02.031

Plasma-sprayed La₂Ce₂O₇ thermal barrier coatings against calcium-magnesium-alumina-silicate penetration

Lihua Gao
, Hongbo Guo^*
, Shengkai Gong
, Huibin Xu

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University

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

137 Scopus citations

Abstract

As one of promising thermal barrier coating (TBC) candidates, La₂Ce₂O₇ (LC) has attracted increasing attention because of its low thermal conductivity and potential capability to be operated above 1250°C. In this paper, the microstructure evolution and mechanical properties of the plasma-sprayed LC TBC with calcium-magnesium-alumina-silicate (CMAS) glassy deposits at 1250°C were investigated. Due to chemical reaction between the CMAS deposits and LC coating, a dense sealing layer, mainly composed of Ca₂(La_xCe_1-x)₈(SiO₄)₆O_6-4x and CeO₂, was formed on the coating after heat-treatment at 1250°C and effectively prevented CMAS from further penetration. The interaction layer had the micro-hardness of ~10-12GPa, relatively harder than the LC coating.

Original language	English
Pages (from-to)	2553-2561
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	34
Issue number	10
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2014.02.031
State	Published - Sep 2014

Keywords

Calcium-magnesium-alumina-silicate (CMAS)
Microstructure
Thermal barrier coatings (TBCs)
Yttria stabilized zirconia (YSZ)

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10.1016/j.jeurceramsoc.2014.02.031

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title = "Plasma-sprayed La2Ce2O7 thermal barrier coatings against calcium-magnesium-alumina-silicate penetration",

abstract = "As one of promising thermal barrier coating (TBC) candidates, La2Ce2O7 (LC) has attracted increasing attention because of its low thermal conductivity and potential capability to be operated above 1250°C. In this paper, the microstructure evolution and mechanical properties of the plasma-sprayed LC TBC with calcium-magnesium-alumina-silicate (CMAS) glassy deposits at 1250°C were investigated. Due to chemical reaction between the CMAS deposits and LC coating, a dense sealing layer, mainly composed of Ca2(LaxCe1-x)8(SiO4)6O6-4x and CeO2, was formed on the coating after heat-treatment at 1250°C and effectively prevented CMAS from further penetration. The interaction layer had the micro-hardness of \textasciitilde{}10-12GPa, relatively harder than the LC coating.",

keywords = "Calcium-magnesium-alumina-silicate (CMAS), Microstructure, Thermal barrier coatings (TBCs), Yttria stabilized zirconia (YSZ)",

author = "Lihua Gao and Hongbo Guo and Shengkai Gong and Huibin Xu",

year = "2014",

month = sep,

doi = "10.1016/j.jeurceramsoc.2014.02.031",

language = "英语",

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pages = "2553--2561",

journal = "Journal of the European Ceramic Society",

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TY - JOUR

T1 - Plasma-sprayed La2Ce2O7 thermal barrier coatings against calcium-magnesium-alumina-silicate penetration

AU - Gao, Lihua

AU - Guo, Hongbo

AU - Gong, Shengkai

AU - Xu, Huibin

PY - 2014/9

Y1 - 2014/9

N2 - As one of promising thermal barrier coating (TBC) candidates, La2Ce2O7 (LC) has attracted increasing attention because of its low thermal conductivity and potential capability to be operated above 1250°C. In this paper, the microstructure evolution and mechanical properties of the plasma-sprayed LC TBC with calcium-magnesium-alumina-silicate (CMAS) glassy deposits at 1250°C were investigated. Due to chemical reaction between the CMAS deposits and LC coating, a dense sealing layer, mainly composed of Ca2(LaxCe1-x)8(SiO4)6O6-4x and CeO2, was formed on the coating after heat-treatment at 1250°C and effectively prevented CMAS from further penetration. The interaction layer had the micro-hardness of ~10-12GPa, relatively harder than the LC coating.

AB - As one of promising thermal barrier coating (TBC) candidates, La2Ce2O7 (LC) has attracted increasing attention because of its low thermal conductivity and potential capability to be operated above 1250°C. In this paper, the microstructure evolution and mechanical properties of the plasma-sprayed LC TBC with calcium-magnesium-alumina-silicate (CMAS) glassy deposits at 1250°C were investigated. Due to chemical reaction between the CMAS deposits and LC coating, a dense sealing layer, mainly composed of Ca2(LaxCe1-x)8(SiO4)6O6-4x and CeO2, was formed on the coating after heat-treatment at 1250°C and effectively prevented CMAS from further penetration. The interaction layer had the micro-hardness of ~10-12GPa, relatively harder than the LC coating.

KW - Calcium-magnesium-alumina-silicate (CMAS)

KW - Microstructure

KW - Thermal barrier coatings (TBCs)

KW - Yttria stabilized zirconia (YSZ)

UR - https://www.scopus.com/pages/publications/84899129819

U2 - 10.1016/j.jeurceramsoc.2014.02.031

DO - 10.1016/j.jeurceramsoc.2014.02.031

M3 - 文章

AN - SCOPUS:84899129819

SN - 0955-2219

VL - 34

SP - 2553

EP - 2561

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 10

ER -

Plasma-sprayed La₂Ce₂O₇ thermal barrier coatings against calcium-magnesium-alumina-silicate penetration

Abstract

Keywords

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