Preparation and thermophysical properties of (La0.4Sm 0.5Yb0.1)2(Zr0.7Ce 0.3)2O7 ceramic for thermal barrier coatings

Ling Liu; Qiang Xu; Fuchi Wang; Hongsong Zhang

doi:10.4028/0-87849-473-1.1334

Preparation and thermophysical properties of (La_0.4Sm _0.5Yb_0.1)₂(Zr_0.7Ce _0.3)₂O₇ ceramic for thermal barrier coatings

Ling Liu, Qiang Xu^*, Fuchi Wang, Hongsong Zhang

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

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

1 Citation (Scopus)

Abstract

A complex rare-earth zirconate (La_0.4Sm_0.5Yb _0.1)₂(Zr_0.7Ce_0.3)₂O ₇ powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation method. The phase composition, microstructure and the thermophysical properties were investigated. XRD results revealed that single phase (La_0.4Sm_0.5Yb_0.1)₂(Zr _0.7Ce_0.3)₂O₇ with pyrochlore structure was prepared and the SEM result showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramic increased, while the thermal conductivity decreased. The results indicated that CTE of the ceramic was slightly higher than that of La₂Zr ₂O₇ and the thermal conductivity of the ceramic was lower than that of La₂Zr₂O₇. These results imply that (La_0.4Sm_0.5Yb_0.1)₂(Zr _0.7Ce_0.3)₂O₇ can be explored as the candidate material for the ceramic layer in TBCs system.

Original language	English
Pages (from-to)	1334-1336
Number of pages	3
Journal	Key Engineering Materials
Volume	368-372 PART 2
DOIs	https://doi.org/10.4028/0-87849-473-1.1334
Publication status	Published - 2008

Keywords

Complex rare-earth zirconate
Coprecipitation
Thermophysical properties

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title = "Preparation and thermophysical properties of (La0.4Sm 0.5Yb0.1)2(Zr0.7Ce 0.3)2O7 ceramic for thermal barrier coatings",

abstract = "A complex rare-earth zirconate (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.3)2O 7 powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation method. The phase composition, microstructure and the thermophysical properties were investigated. XRD results revealed that single phase (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 with pyrochlore structure was prepared and the SEM result showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramic increased, while the thermal conductivity decreased. The results indicated that CTE of the ceramic was slightly higher than that of La2Zr 2O7 and the thermal conductivity of the ceramic was lower than that of La2Zr2O7. These results imply that (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 can be explored as the candidate material for the ceramic layer in TBCs system.",

keywords = "Complex rare-earth zirconate, Coprecipitation, Thermophysical properties",

author = "Ling Liu and Qiang Xu and Fuchi Wang and Hongsong Zhang",

year = "2008",

doi = "10.4028/0-87849-473-1.1334",

language = "English",

volume = "368-372 PART 2",

pages = "1334--1336",

journal = "Key Engineering Materials",

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T1 - Preparation and thermophysical properties of (La0.4Sm 0.5Yb0.1)2(Zr0.7Ce 0.3)2O7 ceramic for thermal barrier coatings

AU - Liu, Ling

AU - Xu, Qiang

AU - Wang, Fuchi

AU - Zhang, Hongsong

PY - 2008

Y1 - 2008

N2 - A complex rare-earth zirconate (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.3)2O 7 powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation method. The phase composition, microstructure and the thermophysical properties were investigated. XRD results revealed that single phase (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 with pyrochlore structure was prepared and the SEM result showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramic increased, while the thermal conductivity decreased. The results indicated that CTE of the ceramic was slightly higher than that of La2Zr 2O7 and the thermal conductivity of the ceramic was lower than that of La2Zr2O7. These results imply that (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 can be explored as the candidate material for the ceramic layer in TBCs system.

AB - A complex rare-earth zirconate (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.3)2O 7 powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation method. The phase composition, microstructure and the thermophysical properties were investigated. XRD results revealed that single phase (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 with pyrochlore structure was prepared and the SEM result showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramic increased, while the thermal conductivity decreased. The results indicated that CTE of the ceramic was slightly higher than that of La2Zr 2O7 and the thermal conductivity of the ceramic was lower than that of La2Zr2O7. These results imply that (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.3)2O7 can be explored as the candidate material for the ceramic layer in TBCs system.

KW - Complex rare-earth zirconate

KW - Coprecipitation

KW - Thermophysical properties

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DO - 10.4028/0-87849-473-1.1334

M3 - Article

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SN - 1013-9826

VL - 368-372 PART 2

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ER -

Preparation and thermophysical properties of (La_0.4Sm _0.5Yb_0.1)₂(Zr_0.7Ce _0.3)₂O₇ ceramic for thermal barrier coatings

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