A higher manganese silicide (HMS) thermoelectric, with composition MnSi1.74, densified by spark plasma sintering, was successfully coated with a glass-ceramic, in order to be used at temperatures higher than 500°C. Compositional changes in both the HMS substrate and the glass-ceramic coating are reviewed and discussed with respect to the electrical properties of the uncoated and coated HMS before and after thermal cycles from RT to 600°C in air. The formation of a Si-deficient layer (MnSi) on the uncoated HMS surface is due to the reaction between the HMS and oxygen at 600°C, thus contributing to a lower power factor in comparison with the as-sintered HMS. Coated HMS samples (after thermal cycles RT-600°C) show a lower electrical resistivity and a significantly higher power factor in comparison with the uncoated ones. The glass-ceramic coating is self-reparable at 600°C, as demonstrated by the complete sealing of an induced scratch on its surface.
Glass-ceramic oxidation protection of higher manganese silicide thermoelectrics / Salvo, M.; Smeacetto, F.; D’Isanto, F.; Viola, G.; Demitri, Paola; Gucci, F.; Reece, M. J.. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - 39:1(2019), pp. 66-71. [10.1016/j.jeurceramsoc.2018.01.007]
Glass-ceramic oxidation protection of higher manganese silicide thermoelectrics
Salvo, M.;Smeacetto, F.;D’Isanto, F.;Viola, G.;DEMITRI, PAOLA;
2019
Abstract
A higher manganese silicide (HMS) thermoelectric, with composition MnSi1.74, densified by spark plasma sintering, was successfully coated with a glass-ceramic, in order to be used at temperatures higher than 500°C. Compositional changes in both the HMS substrate and the glass-ceramic coating are reviewed and discussed with respect to the electrical properties of the uncoated and coated HMS before and after thermal cycles from RT to 600°C in air. The formation of a Si-deficient layer (MnSi) on the uncoated HMS surface is due to the reaction between the HMS and oxygen at 600°C, thus contributing to a lower power factor in comparison with the as-sintered HMS. Coated HMS samples (after thermal cycles RT-600°C) show a lower electrical resistivity and a significantly higher power factor in comparison with the uncoated ones. The glass-ceramic coating is self-reparable at 600°C, as demonstrated by the complete sealing of an induced scratch on its surface.File | Dimensione | Formato | |
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MSalvo et al JECS 2019.pdf
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https://hdl.handle.net/11583/2696567
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