Abstract
A novel FeB-10 wt.% Mo-12 wt.% Al0.25FeNiCoCr (denoted as FeB-10 Mo-12 HEA) cermet and coating were prepared by spark plasma sintering (SPS) and an activated combustion high-velocity air fuel (AC-HVAF) spraying process, respectively. The microstructure, phase compositions, density, microhardness, thermal shock and corrosion resistance of the cermet and coating to molten zinc were characterized in detail. The results show that the phase composition of the coating was the same as that of the cermet, which was composed of an (Fe, Al, Ni, Co, Cr)B solid solution, an (Fe, Al, Ni, Co, Cr)2B solid solution and a Mo phase. The brittleness of FeB and Fe2B was reduced by the Al, Fe, Ni, Co and Cr elements of the high-entropy alloy that was dissolved into them. The addition of Mo, which did not undergo a eutectic reaction with Zn at 450 °C, and the corrosion products (δ phase) increased the corrosion resistance of the novel cermet. Compared with the cermet that was prepared by SPS, the coating that was prepared by AC-HVAF had a lower density, lower microhardness value and worse corrosion resistance to molten zinc because of the layered structure of the coating, in which cracks could form and propagate easily under the action of thermal stress.
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Acknowledgments
This work has been funded by the National Science Foundation of the China (Nos. 11904307, 52001268 and 51771160), the Scientific Research Fund of Hunan Provincial Educational Department (Nos. 18C0111 and 20C1797), the Natural Science Foundation of Hunan Province (Grant Nos. 2019JJ50576 and 2021JJ40539), and the Hunan Postgraduate Research and Innovation Project (No. CX20190478).
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This article is part of a special topical focus in the Journal of Thermal Spray Technology on High Entropy Alloy and Bulk Metallic Glass Coatings. The issue was organized by Dr. Andrew S.M. Ang, Swinburne University of Technology; Prof. B.S. Murty, Indian Institute of Technology Hyderabad; Distinguished Prof. Jien-Wei Yeh, National Tsing Hua University; Prof. Paul Munroe, University of New South Wales; Distinguished Prof. Christopher C. Berndt, Swinburne University of Technology. The issue organizers were mentored by Emeritus Prof. S. Ranganathan, Indian Institute of Sciences.
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Xie, X., Yin, B., Yang, Y. et al. Corrosion Resistance to Molten Zinc of a Novel FeB-10 Mo-12 Al0.25FeNiCoCr Cermet and Coating. J Therm Spray Tech 31, 1423–1438 (2022). https://doi.org/10.1007/s11666-021-01283-y
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DOI: https://doi.org/10.1007/s11666-021-01283-y