The wettability of binary and ternary glasses belonging to SiO2Al2O3-ZrO2 diagram has been studied using the sessile drop technique at 1750 degrees and 1800 degrees C. The ternary SiO2-Al2O3-ZrO2 (90-5-5 wt%) glass has proved to be well appropriated as a molybdenum oxidation barrier coating. The addition of 5 wt% of MoO2 slightly improves its wettablity at higher temperatures without affecting its oxidation barrier properties. The Mo comes into the glass network as a mixture of Mo5+, Mo4+, and Mo6+. After oxidation at 1000 degrees C in oxygen atmosphere, the molybdenum remains in the glass network as Mo6+.