Experimental visualization of microstructure evolution during suspension plasma spraying of thermal barrier coatings |
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| Affiliation: | 1. University West, Trollhättan, Sweden;2. Siemens Turbomachinery AB, Finspång, Sweden;3. GKN Aerospace, Trollhättan, Sweden;1. University West, 461 86 Trollhättan, Sweden;2. Siemens Industrial Turbomachinery AB, 612 83 Finspong, Sweden;3. Linköping University, 581 83 Linköping, Sweden;1. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera, s/n, 46022 Valencia, Spain;2. Instituto de Tecnología Cerámica (ITC), Universitat Jaume I (UJI), Av. Sos Baynat s/n, 12006 Castellón, Spain;3. Instituto de Cerámica y Vidrio (ICV), Consejo Superior de Investigaciones Científicas (CSIC), Kelsen 5, E-28049 Madrid, Spain;1. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 305-0047, Ibaraki, Japan;2. Faculty of Materials Science and Engineering, Warsaw University of Technology (WUT), Wołoska 141, 02-507 Warsaw, Poland;3. Science of Ceramic Processes and Surface Treatments (SPCTS), University of Limoges, 12, rue Atlantis, 87068 Limoges, France |
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| Abstract: | This paper investigates the evolution of microstructure of thermal barrier coatings (TBCs) produced by suspension plasma spraying (SPS) through a careful experimental study. Understanding the influence of different suspension characteristics such as type of solvent, solid load content and median particle size on the ensuing TBC microstructure, as well as visualizing the early stages of coating build-up leading to formation of a columnar microstructure or otherwise, was of specific interest. Several SPS TBCs with different suspensions were deposited under identical conditions (same substrate, bond coat and plasma spray parameters). The experimental study clearly revealed the important role of suspension characteristics, namely surface tension, density and viscosity, on the final microstructure, with study of its progressive evolution providing invaluable insights. Variations in suspension properties manifest in the form of differences in droplet momentum and trajectory, which are found to be key determinants governing the resulting microstructure (e.g., lamellar/vertically cracked or columnar). |
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| Keywords: | Suspension plasma spraying Thermal barrier coatings Droplet momentum Columnar microstructure Microstructure evolution |
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