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Solid particle erosion of thermal spray and physical vapour deposition thermal barrier coatings
RSE – Ricerca per il Sistema Energetico, Via Rubattino, 54, 20134 Milano.
RSE – Ricerca per il Sistema Energetico, Via Rubattino, 54, 20134 Milano.
RSE – Ricerca per il Sistema Energetico, Via Rubattino, 54, 20134 Milano.
RSE – Ricerca per il Sistema Energetico, Via Rubattino, 54, 20134 Milano.
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2011 (English)In: Wear, Vol. 271, no 11-12, 2909-2918 p.Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBC) are used to protect hot path components of gas turbines from hot combustion gases. For a number of decades, in the case of aero engines TBCs are usually deposited by electron beam physical vapour deposition (EB-PVD). EB-PVD coatings have a columnar microstructure that guarantees high strain compliance and better solid particle erosion than PS TBCs. The main drawback of EB-PVD coating is the deposition cost that is higher than that of air plasma sprayed (APS) TBC. The major scientific and technical objective of the UE project TOPPCOAT was the development of improved TBC systems using advanced bonding concepts in combination with additional protective functional coatings. The first specific objective was to use these developments to provide a significant improvement to state-of-the-art APS coatings and hence provide a cost-effective alternative to EB-PVD. In this perspective one standard porous APS, two segmented APS, one EB-PVD and one PS-PVD™ were tested at 700°C in a solid particle erosion jet tester, with EB-PVD and standard porous APS being the two reference systems.Tests were performed at impingement angles of 30° and 90°, representative for particle impingement on trailing and leading edges of gas turbine blades and vanes, respectively. Microquartz was chosen as the erodent being one of the main constituents of sand and fly volcanic ashes. After the end of the tests, the TBC microstructure was investigated using electron microscopy to characterise the failure mechanisms taking place in the TBC.It was found that PS-PVD™ and highly segmented TBCs showed erosion rates comparable or better than EB-PVD samples. © 2011 Elsevier B.V.

Place, publisher, year, edition, pages
2011. Vol. 271, no 11-12, 2909-2918 p.
Keyword [en]
Electron microscopy, High temperature, Solid particle erosion, Thermal spray coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-3554DOI: 10.1016/j.wear.2011.06.013ISBN: 00431648 (ISSN) OAI: oai:DiVA.org:hv-3554DiVA: diva2:437311
Available from: 2011-08-29 Created: 2011-08-29 Last updated: 2016-02-11Bibliographically approved

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