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

Journal of Materiomics (Mar 2020)

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

Affiliations

Xiaofeng Zhang: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China; Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Corresponding author. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China.
Chao Wang: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Ruijun Ye: Shenzhen Customs Industrial Products Inspection Technology Center, Shenzhen, 518067, China
Chunming Deng: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Xinghua Liang: Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science & Technology, Liuzhou, 545000, China; Corresponding author.
Ziqian Deng: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Shaopeng Niu: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Jinbing Song: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Guo Liu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Min Liu: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Kesong Zhou: National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510650, China
Jian Lu: Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
Junli Feng: Shenzhen Customs Industrial Products Inspection Technology Center, Shenzhen, 518067, China

Journal volume & issue: Vol. 6, no. 1
pp. 102 – 108

Abstract

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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, Yb2SiO5 coating, Vertical crack, PS-PVD

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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