Hot corrosion of Mg2SiO4 ceramics exposed to V2O5 at temperatures of 700–1050 °C in air

Abstract The hot corrosion behavior of Mg 2 SiO 4 ceramic was investigated in molten V 2 O 5 at 700-1050 °C. Mg 2 V 2 O 7 and SiO 2 were the main corrosion products which were almost temperature independent. The corrosion layer consisted of two zones. The planar reaction zone (PRZ) was very thin due to the chemical inertness of Mg 2 SiO 4 with V 2 O 5 , while the infiltrated reaction zone (MIRZ) was thick due to the high porosity of the ceramic. The depth of MIRZ increased rapidly with the increase of temperature, indicating that thermo-mechanical damage caused by V 2 O 5 infiltration might be the main degradation mechanism of the Mg 2 SiO 4 based thermal barrier coatings.