Abstract No.:
5740

 Scheduled at:
Thursday, June 08, 2017, Hall 28 3:00 PM
Equipment / Consumables & Powders, Wires, Suspensions II


 Title:
Lamellar bonding enhanced NiCr-Mo coating with comparable erosion resistance to similar bulk by plasma-spraying shell-core-structured powders

 Authors:
Chang-Jiu Li / Xi'an Jiaotong University, P.R. China
Jia-Jia Tian* / Xi'an Jiaotong University, P.R. China
Ya-Ting Wang/ Xi'an Jiaotong University,
Cheng-Xin Li/ Xi'an Jiaotong University, P.R. China
Guan-Jun Yang/ Xi'an Jiaotong University,

 Abstract:
The erosion behaviors of thermally sprayed coatings are significantly influenced by microstructure of coatings. Particularly, the inter-lamellar interface bonding is a key factor to control the erosion resistance of coatings. It has been demonstrated in our previous study that the interface bonding within plasma sprayed nickel based coatings can be remarkably improved through a novel shell-core-structured powder design to increase raise particle temperature near to its boiling point by developing self-metallurgical bondingo. In this study, the erosion behavior of the NiCr-Mo alloy coating was investigated at different impact angles. Results showed that dense and homogenous NiCr-Mo coating with well bonded lamellar interfaces was obtained. Furthermore, the erosion test results indicate that the optimized NiCr-Mo coating exhibts excellent erosion resistance comparable to that of the In-738 alloy bulk. Such erosion resistance is significantly higher than that of conventional NiCr coating, attributing to the much improved interface metallurgical bonding of the NiCr-Mo coating. The examination reveals that erosion mechanism of the NiCr-Mo coating is the same as that of the In-738 alloy bulk at an impact angle of 90°. However, the dominant erosion mechanism of the Ni20Cr coating is the crack propagation along the weakly bonded interface and spalling off of the splats due to its poor interface bonding.

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