Details of Grant 

EPSRC Reference:	GR/R48056/01
Title:	The Generation of Delamination Stresses in Thermal Barrier Coating Systems
Principal Investigator:	Busso, Professor E
Other Investigators:
Researcher Co-Investigators:	Dr M Taylor
Project Partners:	Alstom Group Chromalloy (Uk)ltd
Department:	Mechanical Engineering
Organisation:	Imperial College London
Scheme:	Standard Research (Pre-FEC)
Starts:	04 March 2002	Ends:	03 March 2005	Value (£):	163,393
EPSRC Research Topic Classifications:	Materials Characterisation Materials testing & eng.
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine Manufacturing Energy
Related Grants:
Panel History:
Summary on Grant Application Form
This project, undertaken jointly by the University of Birmingham and Imperial College, will examine the relatively neglected behaviour of thermal barrier coating systems under conditions of low frequency thermal cycling, i.e. of relevance to industrial gas turbines, rather than the high frequency cycling associated with aeroengine operation. Under such conditions, the oxidation performance of the bond coat will be a critical issue and delamination stresses and cracking are expected to develop isothermally as a consequence of a spatial variation in oxidation rates across the bond coat surface. This intrinsic variation will be studied in this research and also simulated in a controlled manner so that the variation in upward displacement rates within the partially-stabilised zirconia top coat can be measured using markers. In this context, particular attention will be given to a TBC system consisting of a Ptaluminide bond coat and EB-PVD top coat and, for the first time, an attempt will be made to evaluate the creep properties of this bond coat. These creep properties will be incorporated into finite-element models that can also allow for the dilatation associated with the spatial variation of oxidation growth rates. The predictions of deformation rates within the top coat will be validated against experimental measurements and will form the basis of a quantitative delamination model. This collaborative, multidisciplinary project is designed to be highly complementary in that the experimental activity will be centred at Birmingham and the modelling activity at Imperial. The project is supported by in-kind contributions from Alstom Power and Chromalloy.
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Organisation Website:	http://www.imperial.ac.uk