A new spallation mechanism of thermal barrier coatings on aero-engine turbine blades

Bo Yuan; Christopher M. Harvey; Rachel C. Thomson; Gary W. Critchlow; Simon Wang

Theoretical and Applied Mechanics Letters (Jan 2018)

A new spallation mechanism of thermal barrier coatings on aero-engine turbine blades

Bo Yuan,
Christopher M. Harvey,
Rachel C. Thomson,
Gary W. Critchlow,
Simon Wang

Affiliations

Bo Yuan: Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
Christopher M. Harvey: Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
Rachel C. Thomson: Department of Materials Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
Gary W. Critchlow: Department of Materials Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
Simon Wang: Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK; School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China; Corresponding author

Journal volume & issue: Vol. 8, no. 1
pp. 7 – 11

Abstract

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ABSTRACT: Laboratory experiments were conducted to study the spallation behaviour of thermal barrier coatings (TBCs) on aero-engine turbine blades manufactured by the electron-beam physical vapour deposition technique (EB-PVD). Intact blades were heated at temperature 1135°C in a furnace for certain time and then cooled to the room temperature in the laboratory condition. It was found that no spallation occurred during cooling, but spallation happened at constant room temperature after cooling. The spallation mechanism is studied by using the mechanical model developed (Harvey 2017 and Wang 2017), which are based on the hypothesis of pockets of energy concentration (PECs). Some observations of the spallation behaviour are well predicted by the model. Keywords: Thermal barrier coating, Interface fracture, Spallation, Pockets of energy concentration, Buckling

Published in Theoretical and Applied Mechanics Letters

ISSN: 2095-0349 (Print)
Publisher: Elsevier
Country of publisher: China
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/theoretical-and-applied-mechanics-letters/

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