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A TEM Study of the Microstructure of Plasma-Sprayed YSZ Near Inter-splat Interfaces

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Abstract

The splat interface bonding state which changes heat transfer conditions and thus the cooling rate during splat cooling may influence the interface microstructure. In this paper, YSZ coating was deposited by atmospheric plasma spraying with substrate cooling during deposition. Subsequent characterization was implemented using high resolution transmission electron microscopy to examine the local microstructures near the interfaces at the bonded and unbonded zones. Selected area diffraction analyses of the splats across both the bonded interface and unbonded interface revealed that all bulk splats present a metastable tetragonal structure. Results showed that the size of columnar grains within a splat was significantly influenced by the interface bonding. At the unbonded region in the splat, large columnar grains form which can be attributed to poor thermal contact of melt to the underlying splat surface before its solidification. At the bonded zones, the splat presents a much fine columnar grain structure, which is attributed to good thermal contact of the melt to the underlying splat before solidification. Moreover, it is evident that the bonded interface region presents a distinct microstructure feature from the fine columnar grains suggesting the crystal defect of high density of dislocations at the interface.

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Acknowledgment

The work was supported by National Basic Research Program (Grant No. 2012CB625100) and National Natural Science Foundation of China (Grant No. 51171144). The authors would like to thank the support of European program Marie Curie IPACTS (Project No: 268696).

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  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China

    Er-Juan Yang, Xiao-Tao Luo, Guan-Jun Yang, Cheng-Xin Li & Chang-Jiu. Li

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Yang, EJ., Luo, XT., Yang, GJ. et al. A TEM Study of the Microstructure of Plasma-Sprayed YSZ Near Inter-splat Interfaces. J Therm Spray Tech 24, 907–914 (2015). https://doi.org/10.1007/s11666-015-0260-0

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