Thermal stability of plasma-sprayed La2Ce2O7/YSZ composite coating |
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| Affiliation: | 1. Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province), School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;2. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;3. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;4. College of Materials Science and Engineering, Chongqing University, Shazhenghie 174, Chongqing, 400045, China;5. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. Ceramic Department of Materials and Energy Research Center (MERC), Karaj, Alborz, Iran;2. Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran;3. Department of Advanced Materials and New Energies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran |
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| Abstract: | A composite coating composed of La2Ce2O2 (LCO) and yttria-stabilized zirconia (YSZ) in a weight ratio of 1:1 was deposited by the plasma spraying using a blended YSZ and LCO powders, and the stability of the LCO/YSZ interface exposed to a high temperature was investigated. The LCO/YSZ deposits were exposed at 1300 °C for different durations. The microstructure evolution at the LCO/YSZ interface was investigated by quasi-in-situ scanning electron microscopy assisted by X-ray energy-dispersive spectrum analyses and X-ray diffraction measurements. At an exposure temperature of 1300 °C, the grain morphology of LCO splats in contact with YSZ splats changed from columnar grains to quasi-axial grains with interface healing, and some grains tended to disappear during the thermal exposure. The results indicate that the phases in LCO–YSZ composite coating are not stable at 1300 °C. The element La in the LCO splat diffused towards the adjacent YSZ splat during the exposure, generating the reaction product layers composed of La2Zr2O7 between the LCO and YSZ splats. After exposed for 200 h, the composite coating consisted of a mixture of mainly La2Zr2O7 and CeO2 and a minor amount of YSZ, accounting for the unusual decrease in the thermal conductivity at the late stage of exposure. |
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| Keywords: | Thermal barrier coatings Plasma spraying Yttria-stabilized zirconia Interface stability |
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