Abstract
ZrB2-based composite coatings have broad application prospects in hypersonic aircraft, rockets, and re-entry spacecraft. However, poor toughness of the ZrB2 coating is an important problem to be solved urgently. This study designed and prepared ZrO2–B4C–Al precursor and nano-ZrB2-based composite coating were prepared in situ by reactive plasma spraying. The obtained toughness values of coating by plasma spraying ZrO2–B4C–Al powder increased by 241% in comparison with the coating by plasma spraying ZrB2–ZrC–Al2O3 powder. The coupling action of the toughening mechanism such as fine-grain strengthening, toughening crack deflection, and crack bridging greatly improved the toughness of the coating. This paper provides a novel idea for the preparation of high-properties nano-ZrB2 based composite coatings.
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Acknowledgements
The authors gratefully acknowledge the financial supports of the National Natural Science Foundation of China (52072110), the Natural Science Foundation of Hebei Province (E2018202034).
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Cui, Yh., Jia, St., Yang, Y. et al. Toughening mechanism of in-situ synthesized ZrB2 based composite coating by plasma spraying. J Mater Sci 57, 4145–4152 (2022). https://doi.org/10.1007/s10853-021-06839-5
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DOI: https://doi.org/10.1007/s10853-021-06839-5