Al2O3-ZrO2-SiO2 ternary glasses for molybdenum oxidation barriers

The wettability of binary and ternary glasses belonging to SiO2 - Al2O3-ZrO2 diagram has been studied using the sessile drop technique at 1750° and 180°C. The ternary SiO 2-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°C in oxygen atmosphere, the molybdenum remains in the glass network as Mo6+.

Supported by the Spanish Science and Technology Ministry under Project MAT2003-04199-C02-01.

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Spain

Related Organizations

Spanish National Research Council
Spain

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