Development of bondcoat layer for long lifetime suspension plasma sprayed thermal barrier coatings
2017 (English)In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc , 2017, Vol. 2, p. 1158-1163Conference 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
New York: Curran Associates, Inc , 2017. Vol. 2, p. 1158-1163
Keywords [en]
Thermal barrier coatings (TBCs), plasma spraying (SPS)
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11939Scopus ID: 2-s2.0-85047484405ISBN: 9781510858220 (print)OAI: oai:DiVA.org:hv-11939DiVA, id: diva2:1167967
Conference
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Note
STC 2017: International Thermal Spray Conference & Exposition abstracts (including proceedings on USB stick)
2017-12-192017-12-192019-01-29Bibliographically approved