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Thermal Shock Property of Al/Ni-ZrO_2 Gradient Thennal Barrier Coatings |
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| Authors: | FAN Jin-juan WANG Quan-sheng ZHANG Wei-fang Failure Analysis Center of Beijing Institute of Aeronautical Materials Beijing China |
| Affiliation: | FAN Jin-juan1,WANG Quan-sheng2,ZHANG Wei-fang1 1. Failure Analysis Center of Beijing Institute of Aeronautical Materials,Beijing,China, 2.Department of material science and engineering,Beijing Institute of Technology,Beijing,China |
| Abstract: | Al/Ni-ZrO2 gradient thennal barrier coatings are made on aluminum substrate using plasma spraying method and one direction thermal shock properties of the coatings are studied in this paper. The results show that pores in coatings link to form cracks vertical to coating surface. They go through the whole ZrO2 coating once vertical cracks form. When thermal shock cycles increase, horizontal cracks that result in coatings failure forms in the coatings and interface. And vertical cracks delay appearance of horizontal cracks and enhance thermal shock property of coatings. Failure mechanisms of coating thermal shock are discussed using experiments and finite element method. |
| Keywords: | gradient thermal barrier coatings one direction shock finite element method |
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