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Tailored Oxidation Barrier Coatings for Mo-Hf-B and Mo-Zr-B Alloys

1
Institute of Materials and Joining Technology, Otto-von-Guericke University Magdeburg, Universitätsplatz, 239106 Magdeburg, Germany
2
Institute of Energy and Climate Research IEK-2, Forschungszentrum Jülich, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2215; https://doi.org/10.3390/ma12142215
Received: 17 June 2019 / Revised: 5 July 2019 / Accepted: 8 July 2019 / Published: 10 July 2019
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Abstract

The cyclic oxidation response of Mo-14Hf-23B and Mo-14.8Zr-26B (compositions in at. %) was investigated in air at 800 °C, which is a critical temperature for Mo-based alloys because of the pesting phenomenon. Rapid oxidation was observed for the unprotected samples, and an oxidation protection coating was developed based on a preceramic polymer with silicon and boron as particulate fillers. Cyclic oxidation tests of the coated samples showed excellent oxidation protection: no Mo, Hf or Zr oxides were found after testing and a small mass gain in the initial stage of oxidation indicated the formation of a glassy protection layer on the alloys surfaces after exposure to air at 800 °C. View Full-Text
Keywords: polymer-derived ceramics; preceramic polymers; perhydropolysilazane; oxidation barrier coatings; Mo-Hf-B; Mo-Zr-B polymer-derived ceramics; preceramic polymers; perhydropolysilazane; oxidation barrier coatings; Mo-Hf-B; Mo-Zr-B
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Smokovych, I.; Bolbut, V.; Krüger, M.; Scheffler, M. Tailored Oxidation Barrier Coatings for Mo-Hf-B and Mo-Zr-B Alloys. Materials 2019, 12, 2215.

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