Papers
Release Time: 2025-04-30Hits:
- Date:2025-04-30
- Title of Paper:Fracture toughness measurements of plasma-sprayed thermal barrier coatings using a modified four-point bending method
- Journal:Surface & Coatings Technology
- Summary: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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如果您需要全文，请email我！ - Co-author:P.F. Zhao, C.A. Sun, X.Y. Zhu, F.L. Shang, C.J. Li
- Volume:204 (2010)
- Page Number:4066–4074
- Translation or Not:No
- Date of Publication:2010-09-06
