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Development of bondcoat layer for long lifetime suspension plasma sprayed thermal barrier coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-2857-0975
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
Siemens Industrial Turbomachinery, Finspång, Sweden.
GKN Aerospace, Trollhättan, Sweden.
2017 (English)In: ISTC 2017: International Thermal Spray Conference & Exposition: abstracts (including proceedings on USB stick), Düsseldorf: DVS Media , 2017, p. 70-Conference paper, Published paper (Refereed)
Abstract [en]

Development of thermal barrier coatings (TBCs) manufactured by suspension plasma spraying (SPS) is of high commercial interest as SPS has been shown capable to produce columnar microstructures similar to the conventionally used electron beam – physical vapour deposition (EB-PVD) process. Moreover, SPS is a significantly cheaper process and can also produce more porous coatings than EB-PVD. However, lifetime of SPS coatings needs to be improved further for them to be applicable in commercial applications.The bondcoat microstructure as well as topcoat-bondcoat interface topography affect the TBC lifetime significantly. The objective of this work was to investigate the feasibility of different bondcoat deposition process for SPS TBCs. In this work, a NiCoCrAlY bondcoat deposited by high velocity air fuel (HVAF) was compared to commercial NiCoCrAlY and PtAl bondcoats. All bondcoat variations were prepared with and without grit blasting the bondcoat surface. SPS was used to deposit the topcoats on all samples using the same spray parameters. Lifetime of these samples was examined by thermal cyclic fatigue and thermal shock testing. The effect of bondcoat deposition process and interface topography on lifetime in each case has been discussed. The results show that HVAF could be a suitable process for bondcoat deposition in SPS TBCs.

Place, publisher, year, edition, pages
Düsseldorf: DVS Media , 2017. p. 70-
Series
DVS Berichte, ISSN 0418-9639 ; 336
Keywords [en]
Thermal barrier coatings (TBCs), plasma spraying (SPS)
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11939ISBN: 978-3-96144-000-9 (print)OAI: oai:DiVA.org:hv-11939DiVA, id: diva2:1167967
Conference
International Thermal Spray Conference 2017, June 7-9, Dusseldorf, Germany
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-08-12Bibliographically approved

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Gupta, Mohit KumarMarkocsan, Nicolaie

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