Abstract
Zr–Y modified silicide coatings have been prepared on an Nb–Ti–Si–Cr based ultrahigh temperature alloy by a pack cementation process. The effects of amount of Zr powder in the pack mixture and co-deposition temperature on the coating structure were assessed. The coatings prepared at 1,250 °C with different amounts of Zr powders in the pack mixture have similar structures, mainly consisting of a thick (Nb,X)Si2 (X represents Ti, Cr and Hf elements) outer layer, a thin (Ti,Nb)5Si4 middle layer and a 1–2 µm thick (Nb,X)5Si3 inner layer. The increased amount of Zr powders in the pack mixtures led to a significant decrease in the coating thickness. The coatings prepared at 1,150 and 1,200 °C have similar structures to that prepared at 1,250 °C. However, when the co-deposition temperature increases to 1,300 and 1,350 °C, a (Ti,Nb)5Si3 outermost layer formed in addition to the three layers mentioned above. The Zr–Y modified silicide coating can protect the base alloy from oxidation at least for 100 h at 1,250 °C in air. The good oxidation resistance of the Zr–Y modified silicide coating is attributed to the formation of a dense scale consisting of SiO2 and TiO2.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51371145, 51431003, 51401166) and the Programme of Introducing Talents of Discipline to Universities (No. B080401).
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Li, X., Guo, X. & Qiao, Y. Structure and Oxidation Behavior of Zr–Y Modified Silicide Coatings Prepared on an Nb–Ti–Si–Cr Based Ultrahigh Temperature Alloy. Oxid Met 83, 253–271 (2015). https://doi.org/10.1007/s11085-014-9519-y
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DOI: https://doi.org/10.1007/s11085-014-9519-y