Abstract
Herein, the effects of Gd2O3 on the laser cladding NiCoCrAlYTa coatings in terms of microstructure, phase structures, high temperature oxidation behaviors were investigated. The results showed that the addition of Gd2O3 changed the composition of coating phases, promoted homogeneous phase distribution, reduced porosity and improved coating density. During oxidation at 1100 °C for 150 h, the increase in the content of added Gd2O3 (at mass fractions of 0, 0.5, 1, 2, 5 and 10%) exhibited an initial inhibitory and then increased effect on the weight-gain rate of the coatings. Overall, 1% Gd2O3 addition resulted in the greatest improvement in the oxidation resistance of the coatings, with 49.58% decreases in oxidation kinetic constants, respectively, compared with those of unmodified coatings. However, at a Gd2O3 content of 10%, the thermally grown oxide on the coating surface exhibited large flaking areas. The high-temperature oxidation kinetic parameters of the coatings exhibited an inverted parabolic form with increasing Gd2O3 content. The higher Gd2O3 content led to the formation of excessive oxygen diffusion channels along grain boundaries, which is the reason for the decrease in the anti-oxidant performance of the coating.
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This work was financially supported by the National Natural Science Foundation of China (No. 52175163).
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Anying Liu: Methodology, experiments designed, writing-original draft, revised manuscript. Xiufang Cui and Guo Jin: Supervision, funding acquisition. Yongzhi Jing, Dianchao Liu, and Xinhe Wang: Conduct experiments, characterization. Zhijia Zhang, Zhuo Chen, and Qicheng Li: Analyzed, specially.
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Liu, A., Cui, X., Jing, Y. et al. Effect of Gd2O3 Addition on High-Temperature Oxidation Performance of NiCoCrAlYTa Coatings. J Therm Spray Tech 33, 1100–1116 (2024). https://doi.org/10.1007/s11666-024-01757-9
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DOI: https://doi.org/10.1007/s11666-024-01757-9