Improving the hot corrosion resistance of plasma sprayed ceria–yttria stabilized zirconia thermal barrier coatings by laser surface treatment |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Key Laboratory of High-Temperature Structure Materials and Protective Coatings, Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China;3. Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universitaet Munich, 80333 Munich, Germany |
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| Abstract: | Ceria–yttria stabilized zirconia (CYSZ) thermal barrier coatings (TBCs) were deposited by air plasma spraying on NiCoCrAlY-coated Inconel 738LC substrates. After that, the surface of plasma sprayed CYSZ TBCs were glazed using a pulsed Nd:YAG laser. The effects of laser glazing on hot corrosion resistance of the coatings were evaluated in presence of 45 wt%Na2SO4 + 55 wt%V2O5 corrosive molten salt at 1000 °C. The results revealed that the hot corrosion resistance of plasma sprayed CYSZ TBCs were enhanced more than twofold by laser surface glazing due to reducing specific reactive area of the dense glazed surface layer and consequently, decreasing the reaction between molten salt and zirconia stabilizers. |
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| Keywords: | Laser glazing Thermal barrier coating Ceria–yttria stabilized zirconia Air plasma spraying Hot corrosion |
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