Abstract
The high-temperature capabilities of multi-phase composites based on Mo5Si3Bx are examined after solid-state processing and pulsed laser deposition (PLD) coating fabrication approaches. These composites are prepared by mechanical alloying of elemental powders and densified by vacuum hot pressing, which is a scalable processing approach. Chemical analyses of the hot-pressed compacts reveal a consistent 15–22 percent loss of boron, which is primarily due to the high-temperature hot-pressing step. Composites possessing sufficient amounts of boron are evaluated by thermogravimetric studies in temperatures up to 1650 °C in air. One composition demonstrates oxidative stability after long-term (100 h) isothermal conditions, as well as thermal cycling to simulate solar-thermal operation. Hot-pressed samples of composites consisting of Mo5Si3Bx + MoSi2 + MoB are also employed as deposition targets for PLD trials. X-ray diffraction analysis of the resulting films indicates the absence of long-range crystallographic order.
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Acknowledgements
The authors wish to acknowledge the contribution of Judith Stuart at RTI International for the mechanical alloying of the Mo–Si–B composites and of Joel Harringa at Ames Laboratory for hot pressing of the mechanical-alloyed powders. The ICP chemical analysis work of Frank Webber at RTI and thermal gravimetric analyses at SETARAM Application Laboratory (Caluire, France) are also gratefully acknowledged. This work was funded by the Research Triangle Solar Fuels Institute, Research Triangle Park, North Carolina, USA. The Research Triangle Solar Fuels Institute (www.solarfuels.org) is a consortium consisting of Duke University, North Carolina State University, RTI International, and the University of North Carolina at Chapel Hill. A portion of this work was also supported by the U.S. Department of Energy, ARPA-E Award No. DE-AR0000414.
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B.A. Cook and C.A. Bonino contributed equally to this work.
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Cook, B.A., Bonino, C.A. & Trainham, J.A. Solid-state processing of oxidation-resistant molybdenum borosilicide composites for ultra-high-temperature applications. J Mater Sci 49, 7750–7759 (2014). https://doi.org/10.1007/s10853-014-8485-8
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DOI: https://doi.org/10.1007/s10853-014-8485-8