Novel thermal barrier coatings based on rare-earth zirconates/YSZ double-ceramic-layer system deposited by plasma spraying

Zhan Guo Liu; Wei Heng Zhang; Jia Hu Ouyang; Yu Zhou

doi:10.1016/j.jallcom.2015.05.189

Novel thermal barrier coatings based on rare-earth zirconates/YSZ double-ceramic-layer system deposited by plasma spraying

Zhan Guo Liu^*
, Wei Heng Zhang
, Jia Hu Ouyang
, Yu Zhou

^*Corresponding author for this work

Harbin Institute of Technology

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

56 Scopus citations

Abstract

Sm₂Zr₂O₇ and (Sm_2/3Yb_1/3)₂Zr₂O₇ feedstocks prepared by spray drying have been used to produce ceramic thermal barrier coatings. Double-ceramic-layer thermal barrier coatings with an under-layer of 8 wt.% yttria-stabilized zirconia (YSZ) and a top-layer of Sm₂Zr₂O₇ or (Sm_2/3Yb_1/3)₂Zr₂O₇ were deposited by plasma spraying. Plasma sprayed Sm₂Zr₂O₇ coatings are composed of a pyrochlore-type phase and a t-ZrO₂ phase, while (Sm_2/3Yb_1/3)₂Zr₂O₇ coatings exhibit a defect fluorite-type structure. The number of thermal shock failure at 1250 °C is 52 and 33 for Sm₂Zr₂O₇/YSZ and (Sm_2/3Yb_1/3)₂Zr₂O₇/YSZ coatings, respectively. The thermal shock failure of zirconates/YSZ double-ceramic-layer coatings mainly occurs inside ceramic layers, and is not caused by the thermal grown oxide layer from the bond coat.

Original language	English
Pages (from-to)	438-444
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	647
DOIs	https://doi.org/10.1016/j.jallcom.2015.05.189
State	Published - 1 Jul 2015
Externally published	Yes

Keywords

Microstructure
Plasma spraying
Thermal barrier coatings
Thermal shock
Zirconate

Access to Document

10.1016/j.jallcom.2015.05.189

Cite this

@article{ecb84ea751d24d238ff9d0f080094c55,

title = "Novel thermal barrier coatings based on rare-earth zirconates/YSZ double-ceramic-layer system deposited by plasma spraying",

abstract = "Sm2Zr2O7 and (Sm2/3Yb1/3)2Zr2O7 feedstocks prepared by spray drying have been used to produce ceramic thermal barrier coatings. Double-ceramic-layer thermal barrier coatings with an under-layer of 8 wt.\% yttria-stabilized zirconia (YSZ) and a top-layer of Sm2Zr2O7 or (Sm2/3Yb1/3)2Zr2O7 were deposited by plasma spraying. Plasma sprayed Sm2Zr2O7 coatings are composed of a pyrochlore-type phase and a t-ZrO2 phase, while (Sm2/3Yb1/3)2Zr2O7 coatings exhibit a defect fluorite-type structure. The number of thermal shock failure at 1250 °C is 52 and 33 for Sm2Zr2O7/YSZ and (Sm2/3Yb1/3)2Zr2O7/YSZ coatings, respectively. The thermal shock failure of zirconates/YSZ double-ceramic-layer coatings mainly occurs inside ceramic layers, and is not caused by the thermal grown oxide layer from the bond coat.",

keywords = "Microstructure, Plasma spraying, Thermal barrier coatings, Thermal shock, Zirconate",

author = "Liu, \{Zhan Guo\} and Zhang, \{Wei Heng\} and Ouyang, \{Jia Hu\} and Yu Zhou",

year = "2015",

month = jul,

day = "1",

doi = "10.1016/j.jallcom.2015.05.189",

language = "英语",

volume = "647",

pages = "438--444",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Novel thermal barrier coatings based on rare-earth zirconates/YSZ double-ceramic-layer system deposited by plasma spraying

AU - Liu, Zhan Guo

AU - Zhang, Wei Heng

AU - Ouyang, Jia Hu

AU - Zhou, Yu

PY - 2015/7/1

Y1 - 2015/7/1

N2 - Sm2Zr2O7 and (Sm2/3Yb1/3)2Zr2O7 feedstocks prepared by spray drying have been used to produce ceramic thermal barrier coatings. Double-ceramic-layer thermal barrier coatings with an under-layer of 8 wt.% yttria-stabilized zirconia (YSZ) and a top-layer of Sm2Zr2O7 or (Sm2/3Yb1/3)2Zr2O7 were deposited by plasma spraying. Plasma sprayed Sm2Zr2O7 coatings are composed of a pyrochlore-type phase and a t-ZrO2 phase, while (Sm2/3Yb1/3)2Zr2O7 coatings exhibit a defect fluorite-type structure. The number of thermal shock failure at 1250 °C is 52 and 33 for Sm2Zr2O7/YSZ and (Sm2/3Yb1/3)2Zr2O7/YSZ coatings, respectively. The thermal shock failure of zirconates/YSZ double-ceramic-layer coatings mainly occurs inside ceramic layers, and is not caused by the thermal grown oxide layer from the bond coat.

AB - Sm2Zr2O7 and (Sm2/3Yb1/3)2Zr2O7 feedstocks prepared by spray drying have been used to produce ceramic thermal barrier coatings. Double-ceramic-layer thermal barrier coatings with an under-layer of 8 wt.% yttria-stabilized zirconia (YSZ) and a top-layer of Sm2Zr2O7 or (Sm2/3Yb1/3)2Zr2O7 were deposited by plasma spraying. Plasma sprayed Sm2Zr2O7 coatings are composed of a pyrochlore-type phase and a t-ZrO2 phase, while (Sm2/3Yb1/3)2Zr2O7 coatings exhibit a defect fluorite-type structure. The number of thermal shock failure at 1250 °C is 52 and 33 for Sm2Zr2O7/YSZ and (Sm2/3Yb1/3)2Zr2O7/YSZ coatings, respectively. The thermal shock failure of zirconates/YSZ double-ceramic-layer coatings mainly occurs inside ceramic layers, and is not caused by the thermal grown oxide layer from the bond coat.

KW - Microstructure

KW - Plasma spraying

KW - Thermal barrier coatings

KW - Thermal shock

KW - Zirconate

UR - https://www.scopus.com/pages/publications/84933526840

U2 - 10.1016/j.jallcom.2015.05.189

DO - 10.1016/j.jallcom.2015.05.189

M3 - 文章

AN - SCOPUS:84933526840

SN - 0925-8388

VL - 647

SP - 438

EP - 444

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Novel thermal barrier coatings based on rare-earth zirconates/YSZ double-ceramic-layer system deposited by plasma spraying

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this