View Item 

Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings

Access Status
Open access
Authors
Yao, W.
Dai, C.
Mao, W.
Lu, Chungsheng
Yang, L.
Zhou, Y.
Date
2012
Type
Journal Article

Metadata
Show full item record
Citation
Yao, W.B. and Dai, C.Y. and Mao, W.G. and Lu, C. and Yang, L. and Zhou, Y.C. 2012. Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings. Surface & Coatings Technology. 206 (18): pp. 3803-3807.
Source Title
Surface & Coatings Technology
DOI
ISSN
School
Department of Mechanical Engineering
Remarks

This is the author’s version of a work in which changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.

URI
Collection
Abstract

An acoustic emission technique was used to monitor the cracking behavior and fracture process of thermal barrier coatings subjected to tensile loading. Acoustic emission signals were extracted and preformed by fast Fourier transform, and their characteristic frequency spectrums and dominant bands were obtained to reveal fracture modes. Three different characteristic frequency bands were confirmed, corresponding to substrate deformation, surface vertical cracking and interface delamination, with the aid of scanning electronic microscopy observations. A map of the tensile failure mechanism of air plasma-sprayed thermal barrier coatings was established. The fracture strength and interfacial shear strength were estimated as 45.73 ± 3.92 MPa and 20.51 ± 1.74 MPa, respectively, which are well in agreement with available results. Highlights: We established several good correlations between AE data and fracture modes. The correlations can be utilized to reveal cracking profile and coating failure. A tensile failure mechanism of coating system was established. Fracture strength of thermal barrier coating has been obtained by this method. The method has a large advantage to study the failure of coating/film materials.