Structure-property relationship and design of plasma-sprayed La2Ce2O7/8YSZ composite coatings for gas turbine blades |
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| Authors: | Kun Liu Yu Bai Jiarong Li Jun Ma Jinguang Du Yang Cao Xiaoke Li |
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| Affiliation: | 1. Mechanical and Electrical Engineering Institute, Zhengzhou University of Light Industry, Zhengzhou 450000, PR China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China;3. Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou 450000, PR China |
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| Abstract: | Novel lanthanum-cerium oxide/8?wt% yttria partially stabilized zirconia (LC/8YSZ) thermal barrier coatings (TBCs) were deposited by supersonic atmospheric plasma spraying. The thermal insulation temperature and thermal shock resistance of LC/8YSZ double-ceramic-layer TBCs (DCL-TBCs) were quantitatively evaluated by a burner rig test. The results showed that the thermal insulation temperature increased with the increase of LC layer thickness in DCL-TBCs. When the thickness ratio between LC layer and 8YSZ layer was close to 1:1, the DCL-TBCs had the highest thermal shock resistance. LC/8YSZ thickness ratio significantly affected the energy release rate and the stress induced by thermal gradient or sintering. The sintering stress was found to be the main reason that caused the delamination of LC layer, however, the stress induced by thermal gradient resulted in the spallation of YSZ layer. |
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| Keywords: | Lanthanum-cerium oxide Thermal barrier coatings Supersonic atmospheric plasma spraying Stress |
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