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5268 |
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Wednesday, June 07, 2017, Hall Y 11:30 AM Plasma Spraying I |
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Novel approaches for thermal spray deposition of fully dense metal and ceramic coatings with well bonded lamellae |
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Chang-Jiu Li* / Xi'an Jiaotong University, P.R. China Shu-Wei Yao/ Xi'an Jiaotong University, Jia-JIa Tian/ Xi'an Jiaotong University, Cheng-Xin Li/ Xi'an Jiaotong University, Guan-Jun Yang/ Xi'an Jiaotong University, Xiao-Tao Luo/ Xi'an Jiaotong University, Shan-Lin Zhang/ Xi'an Jiaotong University, |
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It has been well accepted that thermal spray coating presents a lamellar structure with a limited lamellar interface bonding. It has been great challenge to deposit a fully dense coating with fully bonded lamellae. In this report, two different novel approaches are introduced to deposit fully dense ceramic coatings and metal alloy coatings. With deposition of a specific ceramic coating, it was found that there exists a critical intrinsic bonding temperature corresponding to the glass transient temperature of coating material. Up on splatting of a molten ceramic droplet, as far as the maximum interface temperature between spreading splat and solid splat surface reaches over the intrinsic bonding temperature, a chemical bonding is formed at the interface. Moreover, it will be presented that a simple critical bonding temperature in a linear relation with the melting point of coating materials can be utilized by controlling the deposition temperature to deposit fully dense ceramic coatings. Furthermore, with metal alloy coatings a self-bonding mechanism is proposed for ultra-high temperature molten droplet for dense coating with fully bonded lamellae. Using specially designed core-shell structured powder particles, it will be demonstrated that a bulk-like metal coating is deposited by creating ultra-high temperature molten droplet. It will be found that such coatings present properties and performance of comparable bulk materials. |