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| Damage Behavior of Thermal Barrier Coatings Prepared by EB-PVD under Mechanical Load |
| Received:February 25, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.010 |
| KeyWord:EB-PVD TBCs damage behavior mechanical load |
| Author | Institution |
| MU Ren-de |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| WANG Zhan-kao |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| LU Feng |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| SHU Huan-xuan |
Kunming University of Science and Technology University, Kunming , China |
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| Abstract: |
| Objective To study the damage behavior of thermal barrier coatings prepared by electron beam physical vapor deposition (EB-PVD) under mechanical load. Methods Thermal barrier coatings (TBCs) were prepared by EB-PVD. Fracture characteristics, crack morphology and microstructure were analyzed by SEM and stereo microscope. Tensile properties, stress rupture properties and rotary bending fatigue properties were studied under typical mechanical load conditions. Results The results showed that micro-cracks occurred in ceramic layers and entered the carbide of matrix during elastic plastic deformation. Destructive cracks occurred in the adhesive layer in the tensile testing at room temperature, but not at high temperature. Under stress rupture conditions, cracks started from the elastic deformation stage, then expanded along the clusters of column grains of TBC, but did not extend into the adhesive layer. Cracks first appeared in the adhesive layer, followed by expansion to the matrix in the rotary bending fatigue properties testing. Fatigue cracks on the matrix initiated at the end of cracks in the adhesive layer and sloping sliding extension occurred. Conclusion Improving the toughness of the bonding layer, and reducing crack initiation in the bonding layer and its extension to the matrix, are effective ways for optimization of thermal barrier coating materials and process. |
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