Abstract
The needs for thermal and propulsive efficiency in equipment operating at high temperatures together with stricter environmental legislation are some of the factors driving the search for materials that can withstand harsh operating conditions. Available high-temperature materials, such as Ni-based superalloys, have already reached their maximum performance limits as they are used in applications where they operate close to their solidus temperature. The development of materials for demanding industrial applications is therefore essential. While the properties of niobium-silicon alloys are attractive for high-temperature applications due to the higher temperature capability, there are challenges to be addressed regarding the workability of these alloys. The high melting temperature and low toughness of Nb silicides challenge conventional manufacturing processes such as forging and milling. The Plasma Transferred Arc is the only arc technique that allows to use powders and powder mixtures as feedstock. The arc technique provides higher power efficiency compared to laser-based processes, allowing to manufacture larger components more competitively. This study assesses the fabricability of niobium silicides multilayers by in situ synthesis during the deposition of powder mixtures by plasma transferred arc. Because of the high solubility limit of oxygen in niobium, the investigation also assessed the impact of oxygen content during processing of a Nb + 37 wt.%Si powder mixture in air and argon environments. Powder Plasma Transferred Arc successfully processed the Nb silicide multilayer from a powder mixture. Although changes in the deposition environment required adjustments in the processing parameters, these did not compromise in situ synthesis of NbSi2 and Nb5Si3. The microstructure of the multilayers was affected by the availability of oxygen, and the multilayer processed in argon had superior oxidation behavior.
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The authors gratefully acknowledge the financial support provided by CAPES and CNPq and wish to thank CBMM for supplying the niobium powders and substrate.
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Cardozo, E.P., D’Oliveira, A.S.C.M. Niobium Silicide Multilayers Processed by In Situ Synthesis During Deposition of Powder Mixtures. J. of Materi Eng and Perform 31, 3998–4005 (2022). https://doi.org/10.1007/s11665-021-06460-2
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DOI: https://doi.org/10.1007/s11665-021-06460-2