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5273 |
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Erosion behavior of plasma-sprayed ceramic coatings with different lamellar bonding controlled by deposition temperature based on the critical bonding temperature concept |
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Chang-Jiu Li / Xi'an Jiaotong University, P.R. China Shu-Wei Yao* / Xi'an Jiaotong University, P.R. China Tao Liu/ Xi'an Jiaotong University, Cheng-Xin Li/ Xi'an Jiaotong University, Guan-Jun Yang/ Xi'an Jiaotong University, |
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Interlamellar boning within the plasma-sprayed ceremic coatings is an important factor influencing the properties and performance of coatings. It has been revealed that there exists a critical bonding temperature, which dominates the formation of interlamellar bonding, when a molten ceramic splat is deposited on the substrate with the same material to the sprayed powders. The erosion behavior of thermally sprayed coatings are significantly influenced by the interlamerllar bonding. In this study, the erosion resistance of plasma-sprayed TiO2, Al2O3 and YSZ coatings were investigated. Characterized by the scanning electron microscope from the cross section of plasma-sprayed coatings, it was revealed that the coatings deposited at room temperature exhibit a typical lamellar structure with numerous unbonded interfaces. The coatings deposited at a temperature over the critical bonding temperature present a denser structure with well bonded interfaces. The erosion results reveals that the coatings deposited over critical bonding temperature have a superior erosion resistance compared with conventional coatings. In addition, the erosion mechanisms of conventional coatings and the coatings deposited over critical bonding temperature were discussed. |