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Adhesive strength of new thermal barrier coatings of rare earth zirconates |
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| Authors: | Limin He Zhenhua Xu Xueqiang Cao Rende Mu |
| Affiliation: | a Beijing Institute of Aeronautical Materials, Department 5, P.O. Box 81-5, Beijing 100095, China b State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China c Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | La2Zr2O7 (LZ) and La2(Zr0.7Ce0.3)2O7 (LZ7C3) as novel candidate materials for thermal barrier coatings (TBCs) were prepared by electron beam-physical vapor deposition (EB-PVD). The adhesive strength of the as-deposited LZ and LZ7C3 coatings were evaluated by transverse scratch test. Meanwhile, the factors affecting the critical load value were also investigated. The critical load value of LZ7C3 coating is larger than that of LZ coating, whereas both values of these two coatings are lower than that of the traditional coating material, i.e. 8 wt% yttria stabilized zirconia (8YSZ). The micro-cracks formed in the scratch channel can partially release the stress in the coating and then enhance the adhesive strength of the coating. The width of the scratch channel and the surface spallation after transverse scratch test are effective factors to evaluate the adhesive strength of LZ and LZ7C3 coatings. |
| Keywords: | Thermal barrier coatings Adhesive strength Scratch test EB-PVD |
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