The morphology,thermal property,and failure mechanism of GdNdZrO thermal barrier coatings by EB-PVD |
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| Authors: | Zaoyu Shen Zheng Liu Guanxi Liu Limin He Rende Mu Zhenhua Xu |
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| Affiliation: | 1. Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing, PR China;2. Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing, PR China
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, PR China |
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| Abstract: | Nowadays, the Gd2Zr2O7 thermal barrier coatings (TBCs) have been evaluated as a promising alternative to yttria-stabilized zirconia (YSZ). Thus, this investigation focuses on the thermal property, morphology, and failure mechanism of double ceramic layers (DCLs) GdNdZrO/YSZ advanced TBCs. The GdNdZrO coatings with columnar morphology have been deposited on NiCoCrAlYHf bond coating using an electron beam physical vapor deposition method. Material characterizations mainly include X-ray diffraction, scanning electron microscope, and transmission electron microscopy. The thermal conductivity of GdNdZrO ceramic material is 0.494 W/mK at 1200°C. The thermal shock life of GdNdZrO/YSZ TBCs shows an average shock life of 5235 cycles. The TBC degradation occurs on the crack area within thermally grown oxide layer leading to the interface instability. The interface broken might play an important role in the failure mechanism of TBCs. |
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| Keywords: | EB-PVD failure GdNdZrO thermal barrier coatings thermal property |
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