Effects of bond coat preoxidation on the properties of ZrO2-8wt.% Y2O3/Ni-22Cr-10Al-1Y thermal-barrier coatings |
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| Authors: | W. Lih E. Chang B. C. Wu C. H. Chao |
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| Affiliation: | (1) Department of Materials Engineering, National Cheng Kung University, Tainan, Taiwan, ROC;(2) Industrial Technology Research Institute, Materials Research Laboratories, Hsinchu, Taiwan, ROC;(3) Aero Engine Factory/Aero Industry Development Center, Kang-Shan, Taiwan, ROC |
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| Abstract: | Plasma-sprayed thermal barrier coatings (TBCs) consist of an intermediate MCrAlY bond coat to protect the substrate superalloy from oxidation/hot corrosion and a thermal insulating zirconia-based ceramic top coat. This system is developed for advanced turbine-engine, hot-section components. In this study the as-sprayed Ni-22Cr-10Al-1Y bond coat was subjected to preoxidation treatment at 1000° C for 1, 50, 100, and 200 hr, also at 1100°C, 1200°C and 1300°C for 1 hr to form an oxide scale before subsequent deposition of a ZrO2-8wt.% Y2O3 top coat. The oxidation kinetics were measured, and the phase constitution and morphology of pregrown oxides on the Ni-22Cr-1Y bond coat were analyzed by x-ray diffractometer and SEM/EDS to elucidate the improvement and degradation mechanisms of the new system. The results of the experiments in this study showed that the tentative ZrO2-8wt.% Y2O3 TBC specimens with preoxidized Ni-22Cr-10Al-1Y bond coat, when properly processed, exhibited lower oxidation rates and generally longer lifetime compared with traditional TBC specimens. |
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| Keywords: | thermal-barrier coatings preoxidized Ni-Cr-Al-Y bond coat thermal-cyclic oxidation |
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