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3902 |
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Parametric study on coating development using perovskite solution precursor |
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ILIAS Georgiopoulos* / MIRTEC (Materials Industrial Research and Technology Center) S.A, GREECE C. Andreouli / MIRTEC SA., Greece E. Marathoniti/ General Department of Applied Sciences, Technological Educational Institute of Chalkida, Greece N. Vourdas/ General Department of Applied Sciences, Technological Educational Institute of Chalkida, Greece V. Stathopoulos/ General Department of Applied Sciences, Technological Educational Institute of Chalkida, Greece |
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Developments in turbine engineering calls for a package of actions towards significant technological improvements regarding their materials of construction and their protection. A particular aspect in this package is related to the thermal barrier coatings (TBCs), which are used to protect and insulate the metallic turbine engine components from the hot gas stream, against high temperature corrosion, and subsequent damage. Advances in this field may facilitate higher combustion temperatures and increased engine efficiency in power generation, in aerospace and marine propulsion etc. We present our study on the development of top coats for TBCs using LaAlO3 perovskites. LaAlO3 solution precursors have been prepared using the in situ polymerization technique with citric acid. The shelf-life of the solution was more than 30 weeks. Solution plasma spray (SPS) was used to deliver LaAlO3 top coats. The effect of plasma power, solution feed rate and gas rate is investigated in correlation with process yield, deposition rate and microstructure. XRD characterization of the top coat revealed the presence of perovskite phase, with minor secondary phases. SEM imaging along with microhardness measurements are presented and discussed. We report a facile technique to deliver perovskite top coats for TBCs applications. The work is financially supported by the Project TheBarCode (EC FP7 Program). |