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Microstructural Evolution of SAPS/HVOF CoNiCrAlY Alloy Coating During Thermal Cycling Test

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Abstract

In this paper, CoNiCrAlY alloy coatings were deposited by high-efficiency supersonic atmospheric plasma spraying (SAPS) and high-velocity oxygen fuel (HVOF) spraying. The microstructural evolution of coatings during thermal cycling test was investigated. The results suggested that the as-sprayed SAPS coating consisted of lamellar structures and unmelted particles. However, the as-sprayed HVOF coating primarily consisted of the unmelted particles. The β-NiAl phase mainly existed in the unmelted particles, and its content increased with the increase of unmelted particles. The thermal cycling life of SAPS coating was 258 cycles, about 117 % higher than that of HVOF coating. During thermal cycling, significant internal oxidation and large cracks formed in the HVOF coating, which was one of the reasons that led to the spallation of HVOF coating.

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Acknowledgments

This work was supported by National Basic Research Program (Grant No. 2013CB035701), National Natural Science Foundation of China (Grant No. 51202187), the Fundamental Research Funds for the Central Universities (Grant No. xjj2014125), Natural Science Foundation of Shaanxi Province, China (Grant No. 2015JQ5138), the National Natural Science Foundation of China (Grant No. 51476131) and State Scholarship Fund of China Scholarship Council (Grant No. 201406285038). The authors would like to thank the Professor B.J. Ding and Technician Y.M. Qiang (Xi’an Jiaotong University, China) for their assistance in the preparation and characterization of coatings.

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Tang, J.J., Bai, Y., Liu, K. et al. Microstructural Evolution of SAPS/HVOF CoNiCrAlY Alloy Coating During Thermal Cycling Test. Oxid Met 86, 75–87 (2016). https://doi.org/10.1007/s11085-016-9621-4

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  • DOI: https://doi.org/10.1007/s11085-016-9621-4

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