Oxidation Protective Hybrid Coating for Thermoelectric Materials

Materials (Basel). 2019 Feb 14;12(4):573. doi: 10.3390/ma12040573.


Two commercial hybrid coatings, cured at temperatures lower than 300 °C, were successfully used to protect magnesium silicide stannide and zinc-doped tetrahedrite thermoelectrics. The oxidation rate of magnesium silicide at 500 °C in air was substantially reduced after 120 h with the application of the solvent-based coating and a slight increase in power factor was observed. The water-based coating was effective in preventing an increase in electrical resistivity for a coated tethtraedrite, preserving its power factor after 48 h at 350 °C.

Keywords: Thermoelectrics; hybrid-coating; oxidation resistance.