Preparation and corrosion resistance of nonstoichiometric lanthanum zirconate coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing, 100076, China;3. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200444, China;1. Department of Chemical Engineering, University of Bonab, P.O. Box. 5551761167, Bonab, Islamic Republic of Iran;2. Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P. O. Box. 87317-51167, Islamic Republic of Iran;3. Department of Chemistry, Kosar University of Bojnord, Bojnord, Islamic Republic of Iran;4. Young Researchers and Elites Club, Arak Branch, Islamic Azad University, Arak, Islamic Republic of Iran;1. Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK;2. ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK;1. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an, 710049, PR China;2. Jiangsu Lida Hi-Tech Special Material Co., Ltd, Changshu, 215500, PR China;1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;2. Key Laboratory of Aerospace Materials & Performance (Ministry of Education), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;3. School of Materials Science and Engineering, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;4. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China |
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| Abstract: | Lanthanum zirconate is a promising thermal barrier coating material owing to its excellent thermophysical properties and La plays the key role in its corrosion resistance. Here, an amorphous precursor is used as raw feedstock material so as to synthesize lanthanum zirconate coatings with tailorable composition by atmospheric plasma spray (APS). Three lanthanum zirconate coatings of La1.7Zr2.3O7.15, La2.0Zr2.0O7.0 and La2.3Zr1.7O6.85 are fabricated. Furthermore, the corrosion resistance of the as-sprayed coatings against CaO-MgO-Al2O3-SiO2 at 1250℃ is investigated. The increased La content promotes the formation of a sealing layer of the crystalline Ca2La8(SiO4)6O2 apatite, which slows down the penetration of molten CaO-MgO-Al2O3-SiO2. Therefore, the infiltration rate of the La2.3Zr1.7O6.85 coating decreased up to 42.6 % compared with the other two coatings. This work develops a feasible preparation strategy to control the La composition for the improved corrosion resistance, which is expected to guide the future coating design and synthesis for the materials with big composition changes during the APS process. |
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| Keywords: | Thermal barrier coating Lanthanum zirconate Composition Corrosion resistance |
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