Al2O3–ZrO2–SiO2 Ternary Glasses for Molybdenum Oxidation Barriers |
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Authors: | Ana M Espino Luis A Díaz Adolfo Fernández Ramón Torrecillas José S Moya |
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Affiliation: | INCAR, Spanish Research Council (CSIC), 33011 Oviedo, Spain; ICMM, Spanish Research Council (CSIC), 28049 Madrid, Spain |
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Abstract: | The wettability of binary and ternary glasses belonging to SiO2–Al2O3–ZrO2 diagram has been studied using the sessile drop technique at 1750° and 1800°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°C in oxygen atmosphere, the molybdenum remains in the glass network as Mo6+. |
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