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5218 |
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Evaluation of crack growth and mechanical property of multilayer coating system: a modified deposition process |
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Peng Song* / Kunming University of Science and Technology, P.R. China Heng Luo/ Kunming University of Science and Technology, Yunnan Xiping Xiong/ Kunming University of Science and Technology, Yunnan Junjie Zang/ Kunming University of Science and Technology, Yunnan Chao Li/ Kunming University of Science and Technology, Yunnan Kunlun Chen/ Kunming University of Science and Technology, Yunnan Jiansheng Lu/ Kunming University of Science and Technology, Yunnan Guangliang Liu/ Kunming University of Science and Technology, Yunnan |
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In this research, multilayer coating with inhomogeneous interface was successfully produced with modified process. Evaluate the mechanical property, fracture toughness, as well as crack initiation and propagation with bending test and Vikers indentation. At the same time, the thermal shocking resistance of the multilayer coating was also estimated. Analyzing the phase and microstructure evolution during thermal shocking and bending test with X-ray Diffraction and Scanning Electron Microscope, respectively, was carried out. Lesser cracks were observed at inhomogeneous interface than that of the conventional multilayer coating interface. The fracture toughness increasing of the interface was verified in the research. Moreover, the result shows that the cracks were deflected at the interface, especially at inhomogeneous interface, of two layers with in multilayer coating system. Finally, the longer thermal shocking lifetime of the modified multilayer coating was observed than the conventional coatings. The grain refinement was verified during thermal shocking resistant test. On the other hand, the inhomogeneous interface is the obstacles of cracks generate and propagate during thermal shocking test. These results also demonstrate that the mechanical property of the multilayer coatings spayed is improved in this research than that of conventional multilayer coatings. it was expected to be an candidate coating system for the application in the future. |