Influence of Spray Angle on Microstructure and Lifetime of Suspension Plasma-Sprayed Thermal Barrier CoatingsShow others and affiliations
2022 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, no 31, p. 2068-2090Article in journal (Refereed) Published
Abstract [en]
Thermal barrier coatings (TBCs) are widely utilized in gas turbine engines for power generation. In recent years, the application of TBCs in automotive has been introduced to improve engine efficiency. Low thermal conductivity and high durability are desired coating properties for both gas turbine engines and automotive. Also, suspension plasma spraying (SPS) permits a columnar microstructure that combines both properties. However, it can be challenging to deposit a uniform columnar microstructure on a complex geometry, such as a gas turbine component or piston head, and achieve similar coating characteristics on all surfaces. This work’s objective was to investigate the influence of spray angle on the microstructure and lifetime of TBCs produced by SPS. For this purpose, SPS TBCs were deposited on specimens using different spray angles. The microstructures of the coatings were analyzed by image analysis for thickness, porosity, and column density. Thermal and optical properties were evaluated on each TBC. Lifetime tests, specifically designed for the two applications, were performed on all investigated TBCs. The lifetime results were analyzed with respect to the TBC microstructure and thermal and optical properties. This investigation showed that there is a limit to the spray angle that achieves the best compromise between TBC microstructure, thermal properties, optical properties, and lifetime. © 2022, The Author(s).
Place, publisher, year, edition, pages
Springer, 2022. no 31, p. 2068-2090
Keywords [en]
Gas turbines; Geometry; Microstructure; Optical properties; Plasma jets; Plasma spraying; Sprayed coatings; Thermal conductivity; Automotives; Coating microstructures; Columnar microstructures; Complex geometries; Complex geometry substrate; Gas turbine engine; Plasma-sprayed thermal barrier coating; Power- generations; Spray angle; Suspension plasma spraying; Thermal barrier coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-19178DOI: 10.1007/s11666-022-01436-7ISI: 000825229000002Scopus ID: 2-s2.0-85133597109OAI: oai:DiVA.org:hv-19178DiVA, id: diva2:1715508
Note
The optical properties measurement wassupported by ERDF project ‘‘LABIR-PAV / Pre-application research of infrared technologies’’ reg. no. CZ.02.1.01/0.0/0.0/18_069/0010018.
This article is licensed under a Creative CommonsAttribution 4.0 International License
2022-12-022022-12-022022-12-02Bibliographically approved