Modelling the EB-PVD thermal barrier coating process: Component clusters and shadow masks

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dc.contributor.authorde Matos Loureiro da Silva Pereira, Vitor Emanuel
dc.contributor.authorNicholls, John R.
dc.contributor.authorNewton, Rachel
dc.date.accessioned2017-01-13T09:50:52Z
dc.date.available2017-01-13T09:50:52Z
dc.date.issued2016-12-18
dc.description.abstractElectron beam-physical vapour deposition (EB-PVD) is a commonly employed process for the production of thermal barrier coatings (TBCs), used in high performance applications such as gas turbines high-pressure aerofoil blades for the aerospace industry. Computer modelling can contribute to improved control of the coating process, important to support a continuous drive for increased efficiency. This paper considers two aspects associated with the EB-PVD coating of TBCs for commercial application: firstly, that clusters of blades are coated simultaneously in commercial coaters and, secondly, that these parts possess a complex geometry, such that shadow masks need to be taken into account. In this context, a computer model that calculates coating thickness distribution along the surface of different engine components, based on the analysis of the vapour deposition flux around complex geometries, is presented. To validate the predictive capability of the computer model two deposition trials were performed. Firstly, a cluster of components was simulated using three rotating cylinders, as a simple representation of coating multiple blades. Secondly, the effect of shadow masks was studied with an arrangement in which flat plates were welded, in the form of a U-shaped component, but with one side shorter than the other. The predicted results generated by the computer model compare favourably with those measured in the experimental runs presented. For the cluster of three cylinders, an error of 4% was obtained whilst the divergence was around 20% for the simulated shadow mask due to the fact that overall coating thickness was significantly reduced. In spite of this, the results obtained from the model were promising with respect to the degree of fit of the inverse square law. It is thought that a virtual source may be responsible for measurements being generally higher than those predicted by the model.en_UK
dc.identifier.citationVitor Emanuel de Matos Loureiro da Silva Pereira, John Rayment Nicholls and Rachel Newton. Modelling the EB-PVD thermal barrier coating process: Component clusters and shadow masks. Surface and Coatings Technology, Volume 311, 15 February 2017, pp. 307-313en_UK
dc.identifier.issn0257-8972
dc.identifier.urihttp://dx.doi.org/10.1016/j.surfcoat.2016.12.054
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/11262
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectThermal barrier coatingen_UK
dc.subjectModellingen_UK
dc.subjectSimulationen_UK
dc.subjectProcess controlen_UK
dc.subjectManufactureen_UK
dc.subjectEB-PVDen_UK
dc.titleModelling the EB-PVD thermal barrier coating process: Component clusters and shadow masksen_UK
dc.typeArticleen_UK

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