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Combustion flame spray of CoNiCrAlY & YSZ coatings

Fanicchia, F.; Axinte, D.; Kell, J.; McIntyre, R.; Brewster, G.; Norton, A.D.

Authors

F. Fanicchia

DRAGOS AXINTE dragos.axinte@nottingham.ac.uk
Professor of Manufacturing Engineering

J. Kell

R. McIntyre

G. Brewster

A.D. Norton



Abstract

The properties of CoNiCrAlY and ∼7–8%YSZ layers, used as thermal barrier coatings (TBC) to protect hot gas paths of power generation and aerospace gas turbines, that have been deposited through the Combustion Flame Spray (CFS) process, are assessed and compared to coatings of the same materials deposited through Atmospheric Plasma Spray (APS). Fuel-to-oxygen equivalence ratio, combustion and carrier gases flows, torch standoff distance and powder feed rate values have been varied during the CFS tests in order to assess their effect on microstructural characteristics, i.e. thickness, total porosity, oxide level and microhardness. Results show that, in CFS-deposited coatings, although a higher content of oxide strings and porosity is observed compared to APS, also comparable phase transformations and a higher thermal cyclic lifetime can be achieved with an appropriate tuning of the deposition parameters. Thus, the study demonstrates the excellent capability of the CFS process in depositing thermal barrier coating systems, providing a viable alternative deposition technology for this class of materials at significant hardware simplicity. As the CFS setup has a simple design, this research stimulates a miniaturisation concept of the combustion flame spray torch for allowing its deployment into highly restricted workspaces.

Citation

Fanicchia, F., Axinte, D., Kell, J., McIntyre, R., Brewster, G., & Norton, A. (in press). Combustion flame spray of CoNiCrAlY & YSZ coatings. Surface and Coatings Technology, https://doi.org/10.1016/j.surfcoat.2017.01.070

Journal Article Type Article
Acceptance Date Jan 19, 2017
Online Publication Date Jan 25, 2017
Deposit Date Feb 8, 2017
Publicly Available Date Feb 8, 2017
Journal Surface and Coatings Technology
Print ISSN 0257-8972
Electronic ISSN 0257-8972
Publisher Elsevier
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1016/j.surfcoat.2017.01.070
Keywords Thermal spray; Combustion Flame Spray; Atmospheric Plasma Spray; Thermal barrier coating; CoNiCrAlY bondcoat; Yttria stabilized zirconia YSZ topcoat
Public URL http://eprints.nottingham.ac.uk/id/eprint/40446
Publisher URL http://www.sciencedirect.com/science/article/pii/S0257897217300701
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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