Computational modelling of constrained sintering in EB-PVD thermal barrier coatings

Kumar, S. and Cocks, A.C.F. (2013) Computational modelling of constrained sintering in EB-PVD thermal barrier coatings. Modelling and Simulation in Materials Science and Engineering, 21, 065008. (doi: 10.1088/0965-0393/21/6/065008)

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Abstract

A micromechanical model is developed to simulate the evolution of microstructure during in-service sintering and eventual inter-columnar cracking in coatings made using electron beam vapour deposition (EB-PVD) route. The coating is idealized with a discrete distribution of axisymmetric asperities across interfaces between columnar grains. The model assumes that inter-columnar sintering is driven by changes in interface free energy of columns and the potential energy of the applied stress. Much faster diffusion that occurs over the free surfaces of the asperities is neglected. It is further assumed that the rate of sintering of the contacting asperities is determined by diffusion along the interface between the contacting asperities. Time evolution of contact modulus of the coating is accounted for as a function of sintering strain. The developed macroscopic constitutive model is employed to evaluate the sensitivity of the sintering response to imperfections and examine the conditions under which inter-columnar cracks can develop within the coating.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Shanmugam, Dr Kumar
Authors: Kumar, S., and Cocks, A.C.F.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Modelling and Simulation in Materials Science and Engineering
Publisher:IOP Publishing
ISSN:0965-0393
ISSN (Online):1361-651X

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