Abstract
As new high-temperature structural materials, Mo–Si–B alloys satisfy several requirements such as oxidation and creep resistance. Recently, novel Ti-rich Mo–Si–B alloys have shown an increased creep resistance compared to Ti-free alloys. However, due to the formation of a duplex SiO2–TiO2 oxide layer, which allows for fast ingress of oxygen, the oxidation resistance is poor. To improve the oxidation resistance, a borosilicate-based coating was applied to a Mo–12.5Si–8.5B–27.5Ti (in at.%) alloy. After co-deposition of Si and B by pack cementation at 1000 °C in Ar, a conditioning anneal at 1400 °C is used to develop an outer borosilicate layer followed by an inner MoSi2 and Mo5Si3 layer. During both isothermal and cyclic oxidation after an initial mass loss during the first hours of exposure, a steady state is reached for times up to 1000 h at temperatures ranging from 800 to 1200 °C, demonstrating a significantly enhanced oxidation resistance.
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Acknowledgements
The financial support of Deutsche Forschungsgemeinschaft (DFG) and by Karlsruhe House of Young Scientists (KYHS) is gratefully acknowledged. AK thanks the Carl Zeiss Foundation for funding. The support of ONR (N00014-10-1-0913) for JHP is gratefully acknowledged. This work was partly carried out with the support of the Karlsruhe Nano Micro Facility (KNMF, www.knmf.kit.edu), a Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT, http://www.kit.edu).
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Schliephake, D., Gombola, C., Kauffmann, A. et al. Enhanced Oxidation Resistance of Mo–Si–B–Ti Alloys by Pack Cementation. Oxid Met 88, 267–277 (2017). https://doi.org/10.1007/s11085-017-9730-8
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DOI: https://doi.org/10.1007/s11085-017-9730-8