Fracture toughness measurements of plasma-sprayed thermal barrier coatings using a modified four-point bending method
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Fracture toughness measurements of plasma-sprayed thermal barrier coatings using a modified four-point bending method
- 发表刊物：
- Surface & Coatings Technology
- 摘要：
- In this study, the adhesion strength of thermal barrier coatings 8YSZ (ZrO2+8 wt.% Y2O3) deposited on
NiCrAlY bond coats by atmospheric plasma spraying is investigated experimentally. A modified four-point
bending specimen that can generate a single interface crack to facilitate the control of crack growth was
adopted for testing. The fracture surfaces were examined using a scanning electron microscope. Images show
that cracks are initiated along YSZ/NiCrAlY interfaces, then kink and grow uniformly within the YSZ layer.
The load–displacement curves obtained indicate three distinct stages in crack initiation and stable crack
growth. Based on a microstructural model, finite element analyses were performed to extract the bonding
strength of the thermal barrier coatings. The fracture toughness of the plasma-sprayed 8YSZ coatings, in
terms of critical strain energy release rate Gc, can be reliably obtained from an analytical solution or from a
numerical simulation of the cracking process using compliance methods.
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- 合写作者：
- P.F. Zhao, C.A. Sun, X.Y. Zhu, F.L. Shang, C.J. Li
- 卷号：
- 204 (2010)
- 页面范围：
- 4066–4074
- 是否译文：
- 否
- 发表时间：
- 2010-09-06