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Influence of bondcoat surface characteristics on lifetime in suspension plasma sprayed thermal barrier coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-4201-668X
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
Siemens Turbomachinery, Finspång, Sweden.
GKN Aerospace, Trollhättan, Sweden.
2017 (English)In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc , 2017, Vol. 2, p. 883-887Conference paper, Published paper (Refereed)
Abstract [en]

Development of TBCs allowing higher combustion temperatures in gas turbines is of high commercial interest since it results in higher fuel efficiency and lower emissions. It is well known that TBCs produced by suspension plasma spraying (SPS) have lower thermal conductivity as compared to conventional systems due to their very fine porous microstructure. Moreover, columnar structured SPS TBCs are significantly cheaper to produce as compared to the conventionally used electron beam - physical vapour deposition (EB-PVD). However, SPS TBCs have not yet been commercialised due to low reliability and life expectancy of the coatings. Lifetime of a TBC system is significantly dependent on topcoat-bondcoat interface topography. The objective of this work was to study the effect of topcoat-bondcoat interface in SPS TBCs by changing bondcoat spray parameters and bondcoat surface heat treatment High velocity air fuel (HVAF) spraying was used for bondcoat deposition while axial-SPS was used for topcoat deposition. Same topcoat spray parameters were used for all samples. Lifetime was examined by thermal cyclic fatigue and thermal shock testing. The influence of surface roughness on lifetime has been discussed. The results show that HVAF could be a suitable process for bondcoat deposition to achieve long lifetime SPS TBCs. 

Place, publisher, year, edition, pages
New York: Curran Associates, Inc , 2017. Vol. 2, p. 883-887
Keywords [en]
Air, Combustion, Gas emissions, Gas turbines, Phase interfaces, Physical vapor deposition, Plasma jets, Plasma spraying, Shock testing, Sprayed coatings, Surface roughness, Surface treatment, Thermal conductivity, Thermal spraying, Combustion temperatures, High velocity air fuels, Physical vapour deposition, Plasma-sprayed thermal barrier coating, Surface characteristics, Surface heat treatment, Suspension plasma spraying, Thermal cyclic fatigue, Thermal barrier coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-13056Scopus ID: 2-s2.0-85047451266ISBN: 9781510858220 (print)OAI: oai:DiVA.org:hv-13056DiVA, id: diva2:1259069
Conference
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-01-10Bibliographically approved

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Gupta, Mohit KumarMarkocsan, Nicolaie

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