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.

为了在高于500°C的温度下使用，成功地用玻璃陶瓷涂覆了成分为MnSi1.74（通过火花等离子烧结致密化）的高锰硅化物（HMS）热电材料。回顾和讨论了HMS基材和玻璃陶瓷涂层中的成分变化，涉及在空气中从RT到600°C的热循环之前和之后未涂覆和涂覆的HMS的电性能。未涂覆的HMS表面上形成的Si缺陷层（MnSi）是由于HMS与氧气在600°C之间的反应所致，因此与烧结后的HMS相比，其功率因数较低。涂层的HMS样品（在RT-600°C的热循环之后）与未涂层的HMS样品相比，具有较低的电阻率和明显更高的功率因数。