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CLC number: O34

On-line Access: 2010-10-05

Received: 2010-04-16

Revision Accepted: 2010-07-05

Crosschecked: 2010-09-06

Cited: 3

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.10 P.794-803


Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures

Author(s):  Peng-fei Zhao, Fu-lin Shang

Affiliation(s):  Department of Engineering Mechanics, School of Aerospace, Xian Jiaotong University, Xian 710049, China

Corresponding email(s):   zhaopengfei@stu.xjtu.edu.cn, shangfl@mail.xjtu.edu.cn

Key Words:  Thermal barrier coating (TBC), Three-point bending test, Finite element analysis, Delamination toughness

Peng-fei Zhao, Fu-lin Shang. Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures[J]. Journal of Zhejiang University Science A, 2010, 11(10): 794-803.

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%T Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures
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%A Fu-lin Shang
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000173

T1 - Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures
A1 - Peng-fei Zhao
A1 - Fu-lin Shang
J0 - Journal of Zhejiang University Science A
VL - 11
IS - 10
SP - 794
EP - 803
%@ 1673-565X
Y1 - 2010
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1000173

The failure mode and adhesion of thermal barrier coating (TBC) 8YSZ (ZrO2+8% (w/w) Y2O3) deposited on NiCoCrAlTaY bond coat by atmospheric plasma spraying were investigated. A grooved modified three-point bending specimen that can generate a single interface crack to facilitate the control of crack growth was adopted for testing, which was conducted at the ambient temperature of 100 °C. The morphology and composition of fractured surfaces were examined by means of a scanning electron microscopy (SEM) and an energy disperse spectroscopy (EDS). Images and spectrum show that cracks are initiated and propagated exclusively within YSZ layer adjacent to top/bond coat interface. The load-displacement curves obtained exhibit similar shapes that indicate two distinct stages in crack initiation and stable crack growth. Finite element analyses were performed to extract the adhesion strength of the TBCs. The delamination toughness of the plasma-sprayed 8YSZ coatings at 100 °C, in terms of critical strain energy release rate Gc, can be reliably obtained from an analytical solution.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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