Thermophysical properties of complex rare-earth zirconate ceramic for thermal barrier coatings

Ling Liu; Qiang Xu; Fuchi Wang; Hongsong Zhang

doi:10.1111/j.1551-2916.2008.02433.x

Thermophysical properties of complex rare-earth zirconate 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

23 Citations (Scopus)

Abstract

Two complex rare-earth zirconates (La_0.4Sm_0.5Yb _0.1)₂ (Zr_0.7Ce_0.4)₂O _7.4 and (Sr_0.1La_0.3Sm_0.5Yb _0.1)₂(Zr_0.7Ce_0.4)₂O _7.3 for thermal barrier coatings (TBCs) were synthesized by the coprecipitation method. Their phase composition, microstructure, and thermophysical properties were investigated. X-ray diffractometry results revealed that single-phase (La_0.4Sm_0.5Yb _0.1)₂(Zr_0.7Ce_0.4)₂O _7.4 and (Sr_0.1La_0.3Sm_0.5Yb _0.1)₂(Zr_0.7Ce_0.4)₂O _7.3 with pyrochlore structure were prepared, and the scanning electron microscopy results showed that the microstructures of the products were dense and no other phases existed among the grains. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramics increased, while the thermal conductivity decreased. The results indicated that the CTE of (Sr_0.1La_0.3Sm_0.5Yb_0.1) ₂(Zr_0.7Ce_0.4)₂O_7.3 was slightly higher than that of (La_0.4Sm_0.5Yb _0.1)₂(Zr_0.7Ce_0.4)₂O _7.4 and the thermal conductivity of (Sr_0.1La _0.3Sm_0.5Yb_0.1)₂(Zr _0.7Ce_0.4)₂O_7.3 was lower than that of (La_0.4Sm_0.5Yb_0.1)₂(Zr _0.7Ce_0.4)₂O_7.4. These results imply that the thermophysical properties of (Sr_0.1La_0.3Sm _0.5Yb_0.1)₂(Zr_0.7Ce _0.4)₂O_7.3 are better than that of (La _0.4Sm_0.5Yb_0.1)₂(Zr _0.7Ce_0.4)₂O_7.4 as the material for the ceramic layer in the TBC system.

Original language	English
Pages (from-to)	2398-2401
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	91
Issue number	7
DOIs	https://doi.org/10.1111/j.1551-2916.2008.02433.x
Publication status	Published - Jul 2008

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@article{5f553acde3134183a3ab4fa8e22e9dc2,

title = "Thermophysical properties of complex rare-earth zirconate ceramic for thermal barrier coatings",

abstract = "Two complex rare-earth zirconates (La0.4Sm0.5Yb 0.1)2 (Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 for thermal barrier coatings (TBCs) were synthesized by the coprecipitation method. Their phase composition, microstructure, and thermophysical properties were investigated. X-ray diffractometry results revealed that single-phase (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 with pyrochlore structure were prepared, and the scanning electron microscopy results showed that the microstructures of the products were dense and no other phases existed among the grains. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramics increased, while the thermal conductivity decreased. The results indicated that the CTE of (Sr0.1La0.3Sm0.5Yb0.1) 2(Zr0.7Ce0.4)2O7.3 was slightly higher than that of (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and the thermal conductivity of (Sr0.1La 0.3Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.3 was lower than that of (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4. These results imply that the thermophysical properties of (Sr0.1La0.3Sm 0.5Yb0.1)2(Zr0.7Ce 0.4)2O7.3 are better than that of (La 0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4 as the material for the ceramic layer in the TBC system.",

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

year = "2008",

month = jul,

doi = "10.1111/j.1551-2916.2008.02433.x",

language = "English",

volume = "91",

pages = "2398--2401",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

number = "7",

}

TY - JOUR

T1 - Thermophysical properties of complex rare-earth zirconate ceramic for thermal barrier coatings

AU - Liu, Ling

AU - Xu, Qiang

AU - Wang, Fuchi

AU - Zhang, Hongsong

PY - 2008/7

Y1 - 2008/7

N2 - Two complex rare-earth zirconates (La0.4Sm0.5Yb 0.1)2 (Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 for thermal barrier coatings (TBCs) were synthesized by the coprecipitation method. Their phase composition, microstructure, and thermophysical properties were investigated. X-ray diffractometry results revealed that single-phase (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 with pyrochlore structure were prepared, and the scanning electron microscopy results showed that the microstructures of the products were dense and no other phases existed among the grains. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramics increased, while the thermal conductivity decreased. The results indicated that the CTE of (Sr0.1La0.3Sm0.5Yb0.1) 2(Zr0.7Ce0.4)2O7.3 was slightly higher than that of (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and the thermal conductivity of (Sr0.1La 0.3Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.3 was lower than that of (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4. These results imply that the thermophysical properties of (Sr0.1La0.3Sm 0.5Yb0.1)2(Zr0.7Ce 0.4)2O7.3 are better than that of (La 0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4 as the material for the ceramic layer in the TBC system.

AB - Two complex rare-earth zirconates (La0.4Sm0.5Yb 0.1)2 (Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 for thermal barrier coatings (TBCs) were synthesized by the coprecipitation method. Their phase composition, microstructure, and thermophysical properties were investigated. X-ray diffractometry results revealed that single-phase (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and (Sr0.1La0.3Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.3 with pyrochlore structure were prepared, and the scanning electron microscopy results showed that the microstructures of the products were dense and no other phases existed among the grains. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramics increased, while the thermal conductivity decreased. The results indicated that the CTE of (Sr0.1La0.3Sm0.5Yb0.1) 2(Zr0.7Ce0.4)2O7.3 was slightly higher than that of (La0.4Sm0.5Yb 0.1)2(Zr0.7Ce0.4)2O 7.4 and the thermal conductivity of (Sr0.1La 0.3Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.3 was lower than that of (La0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4. These results imply that the thermophysical properties of (Sr0.1La0.3Sm 0.5Yb0.1)2(Zr0.7Ce 0.4)2O7.3 are better than that of (La 0.4Sm0.5Yb0.1)2(Zr 0.7Ce0.4)2O7.4 as the material for the ceramic layer in the TBC system.

UR - https://www.scopus.com/pages/publications/64549133825

U2 - 10.1111/j.1551-2916.2008.02433.x

DO - 10.1111/j.1551-2916.2008.02433.x

M3 - Article

AN - SCOPUS:64549133825

SN - 0002-7820

VL - 91

SP - 2398

EP - 2401

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 7

ER -

Thermophysical properties of complex rare-earth zirconate ceramic for thermal barrier coatings

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