Abstract
This research aims to develop a direct-contact manganese silicon p/n multilayer-type thermoelectric power generation block. p-type MnSi1.74 and n-type Mn0.7Fe0.3Si1.68 ball-milled powders with diameter of about 10 μm or less were mixed with polyvinyl butyl alcohol diluted with methylbenzene at pigment volume concentration of approximately 70%. The doctor-blade method produced 45-μm-thick p- and n-type pigment plates. The insulator, i.e., powdered glass, was mixed with cellulose to form insulator slurry. Lamination of manganese silicide pigment layers and screen-printed insulator layers was carried out to fabricate multilayer direct-contact thermoelectric devices. Hot pressing and spark plasma sintering were carried out at 450°C and 900°C, respectively. Four to 30 thermoelectric (TE) p/n pairs were fabricated in a 10 mm × 10 mm × 10 mm sintered TE block. The maximum output was 11.7 mW/cm2 at a temperature difference between 20°C and 700°C, which was about 1/85 of the ideal power generation estimated from the thermoelectric data of the bulk MnSi1.74 and Mn0.7Fe0.3Si1.68 materials. A power generation test using an engine test bench was also carried out.
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Acknowledgements
This research was supported by the Japanese Ministry of Economy, Trade, and Industry under the program “Strategical Support Program for Innovative Basic Technology, 2010–2012.” The research results were obtained by close collaboration between Tohoku Ceramic Co., Ltd., Murata Manufacturing Co., Ltd., NGK Spark Plug Co., Ltd., and Tohoku University over a period of 3 years.
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Kajitani, T., Ueno, T., Miyazaki, Y. et al. Fabrication of Multilayer-Type Mn-Si Thermoelectric Device. J. Electron. Mater. 43, 1993–1999 (2014). https://doi.org/10.1007/s11664-013-2933-0
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DOI: https://doi.org/10.1007/s11664-013-2933-0