Abstract
The deposition rate plays an important role in determining the thickness, stress state, and physical properties of plasma-sprayed coatings. In this article, the effect of the deposition rate on the stress evolution during the deposition (named evolving stress) of yttria-stabilized zirconia coatings was systematically studied by varying the powder feed rate and the robot-scanning speed. The evolving stress during the deposition tends to increase with the increased deposition rate, and this tendency was less significant at a longer spray distance. In some cases, the powder feed rate had more significant influence on the evolving stress than the robot speed. This tendency can be associated with a deviation of a local deposition temperature at a place where sprayed particles are deposited from an average substrate temperature. At a further higher deposition rate, the evolving stress was relieved by introduction of macroscopic vertical cracks as well as horizontal branching cracks.
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Acknowledgments
This study was supported by the GOALI program sponsored by the US National Science Foundation under award CMMI 1030492. Support through the Industrial Consortium for Thermal Spray Technology is gratefully acknowledged. We would like to appreciate Prof. Toshio Nakamura for his valuable comments on the stress measurement. We would also like to thank Mr. Travis Wentz and Riston Rocchio-Heller for their help in the spray experiments, and Dr. Brian Choi for SEM images. A part of experiment using a Triplex 200 Pro plasma torch was conducted at Sulzer Metco, Westbury, NY, USA.
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Shinoda, K., Colmenares-Angulo, J., Valarezo, A. et al. Effect of Deposition Rate on the Stress Evolution of Plasma-Sprayed Yttria-Stabilized Zirconia. J Therm Spray Tech 21, 1224–1233 (2012). https://doi.org/10.1007/s11666-012-9807-5
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DOI: https://doi.org/10.1007/s11666-012-9807-5