Abstract
We have studied the influence of humidity on the production yield of Mg2Si thermoelectric (TE)-legs synthesized by spark plasma sintering (SPS) and also the influence of sintered density and MgO impurity on the oxidation resistance of the Mg2Si sintered compacts. We observed a strong correlation between the humidity in air atmosphere and the yield rate of Mg2Si TE-legs. The Mg2Si TE-legs sintered from the raw material powder that was exposed to an atmosphere with humidity >60% contained relatively high density of voids and cracks due to the reaction of adsorbed moisture and Mg2Si during SPS. We found that the Mg2Si sintered density strongly affected the oxidation resistance, whereas a small amount of MgO concentration in the initial sintered compacts had no significant effect on the oxidation resistance. Sb-doped Mg2Si with a high sintered density showed an excellent oxidation resistance in air atmosphere when subjected to an oxidation-resistance test at 600°C for 800 h, which is presumed to be due to the formation of a dense MgO layer on the surface.
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Acknowledgements
The authors would like to thank Prof. T. Ikeda (Ibaraki University) for fruitful discussion and members in research and development (R&D) center, Showa KDE Co. Ltd., for their cooperation in synthesis and measurements.
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Mito, Y., Ogino, A., Konno, S. et al. Influence of Humidity, Volume Density, and MgO Impurity on Mg2Si Thermoelectric-Leg. J. Electron. Mater. 46, 3103–3108 (2017). https://doi.org/10.1007/s11664-016-5182-1
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DOI: https://doi.org/10.1007/s11664-016-5182-1