Mechanism of vertical crack formation in Yb2SiO5 coatings deposited via plasma spray-physical vapor deposition

Xiaofeng Zhang; Chao Wang; Ruijun Ye; Chunming Deng; Xinghua Liang; Ziqian Deng; Shaopeng Niu; Jinbing Song; Guo Liu; Min Liu; Kesong Zhou; Jian Lu; Junli Feng

doi:10.1016/j.jmat.2020.01.002

Mechanism of vertical crack formation in Yb₂SiO₅ coatings deposited via plasma spray-physical vapor deposition

Xiaofeng Zhang^*
, Chao Wang
, Ruijun Ye
, Chunming Deng
, Xinghua Liang^*
, Ziqian Deng
, Shaopeng Niu
, Jinbing Song
, Guo Liu
, Min Liu
, Kesong Zhou
, Jian Lu
, Junli Feng

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

46 Citations (Scopus)

98 Downloads (CityUHK Scholars)

Abstract

Plasma spray-physical vapor deposition (i.e., PS-PVD) is a promising method for obtaining advanced environmental barrier coatings (EBCs). The EBCs must meet some requirements in the application, in which the thermal cycle performance affects the service lifetime. The preparation of artificial vertical cracks in Yb₂SiO₅ coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain tolerance. To clarify the formation mechanism of vertical cracks during the PS-PVD, the effects of coating thickness and substrate temperature on the formation of vertical cracks were investigated. In addition, the interactions of spray powder and plasma flame during coating deposition were also characterized by optical spectroscopy. It is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb₂SiO₅ and mullite coating, transient cooling after deposition and the nucleation of evaporated Yb₂SiO₅ as well.

Original language	English
Pages (from-to)	102-108
Journal	Journal of Materiomics
Volume	6
Issue number	1
Online published	16 Jan 2020
DOIs	https://doi.org/10.1016/j.jmat.2020.01.002
Publication status	Published - Mar 2020

Research Keywords

Environmental barrier coatings
PS-PVD
Vertical crack
Yb2SiO5 coating

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@article{7bc8a20ae79b47ee8a4833fa03635620,

title = "Mechanism of vertical crack formation in Yb2SiO5 coatings deposited via plasma spray-physical vapor deposition",

abstract = "Plasma spray-physical vapor deposition (i.e., PS-PVD) is a promising method for obtaining advanced environmental barrier coatings (EBCs). The EBCs must meet some requirements in the application, in which the thermal cycle performance affects the service lifetime. The preparation of artificial vertical cracks in Yb2SiO5 coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain tolerance. To clarify the formation mechanism of vertical cracks during the PS-PVD, the effects of coating thickness and substrate temperature on the formation of vertical cracks were investigated. In addition, the interactions of spray powder and plasma flame during coating deposition were also characterized by optical spectroscopy. It is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb2SiO5 and mullite coating, transient cooling after deposition and the nucleation of evaporated Yb2SiO5 as well.",

keywords = "Environmental barrier coatings, PS-PVD, Vertical crack, Yb2SiO5 coating",

author = "Xiaofeng Zhang and Chao Wang and Ruijun Ye and Chunming Deng and Xinghua Liang and Ziqian Deng and Shaopeng Niu and Jinbing Song and Guo Liu and Min Liu and Kesong Zhou and Jian Lu and Junli Feng",

year = "2020",

month = mar,

doi = "10.1016/j.jmat.2020.01.002",

language = "English",

volume = "6",

pages = "102--108",

journal = "Journal of Materiomics",

issn = "2352-8478",

publisher = "Chinese Ceramic Society",

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TY - JOUR

T1 - Mechanism of vertical crack formation in Yb2SiO5 coatings deposited via plasma spray-physical vapor deposition

AU - Zhang, Xiaofeng

AU - Wang, Chao

AU - Ye, Ruijun

AU - Deng, Chunming

AU - Liang, Xinghua

AU - Deng, Ziqian

AU - Niu, Shaopeng

AU - Song, Jinbing

AU - Liu, Guo

AU - Liu, Min

AU - Zhou, Kesong

AU - Lu, Jian

AU - Feng, Junli

PY - 2020/3

Y1 - 2020/3

N2 - Plasma spray-physical vapor deposition (i.e., PS-PVD) is a promising method for obtaining advanced environmental barrier coatings (EBCs). The EBCs must meet some requirements in the application, in which the thermal cycle performance affects the service lifetime. The preparation of artificial vertical cracks in Yb2SiO5 coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain tolerance. To clarify the formation mechanism of vertical cracks during the PS-PVD, the effects of coating thickness and substrate temperature on the formation of vertical cracks were investigated. In addition, the interactions of spray powder and plasma flame during coating deposition were also characterized by optical spectroscopy. It is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb2SiO5 and mullite coating, transient cooling after deposition and the nucleation of evaporated Yb2SiO5 as well.

AB - Plasma spray-physical vapor deposition (i.e., PS-PVD) is a promising method for obtaining advanced environmental barrier coatings (EBCs). The EBCs must meet some requirements in the application, in which the thermal cycle performance affects the service lifetime. The preparation of artificial vertical cracks in Yb2SiO5 coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain tolerance. To clarify the formation mechanism of vertical cracks during the PS-PVD, the effects of coating thickness and substrate temperature on the formation of vertical cracks were investigated. In addition, the interactions of spray powder and plasma flame during coating deposition were also characterized by optical spectroscopy. It is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb2SiO5 and mullite coating, transient cooling after deposition and the nucleation of evaporated Yb2SiO5 as well.

KW - Environmental barrier coatings

KW - PS-PVD

KW - Vertical crack

KW - Yb2SiO5 coating

UR - https://www.scopus.com/pages/publications/85079287105

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85079287105&origin=recordpage

U2 - 10.1016/j.jmat.2020.01.002

DO - 10.1016/j.jmat.2020.01.002

M3 - RGC 21 - Publication in refereed journal

SN - 2352-8478

VL - 6

SP - 102

EP - 108

JO - Journal of Materiomics

JF - Journal of Materiomics

IS - 1

ER -