Study Concerning Influence of Molybdenum, Copper and Magnesium on Sodium-Aluminum-Phosphate Glass Characteristics
Properties of sodium-aluminum-phosphate glass were studied in MoO <sub>3</sub>, MoO <sub>3</sub>-MgO, CuO, CuO-MgO and MgO systems. Melt viscosity, thermal stability, homogeneity of raw and tempered glass and chemical stability were determined. It was demonstrated that glass of the above mentioned composition was thermally not stable and crystallized after fritting. As to homogeneity, predominantly glasses containing molybdenum and copper were inhomogeneous of all raw and tempered glasses. All compositions met requirements concerning melting temperature (from 900 to 1100 °С) and glass melt viscosity (below 100 Ps) within the temperature range of glass manufacturing. According to the derived data on chemical stability of tempered and fritted samples following concentration limits of components in glass could be distinguished: MoO <sub>3</sub> below 2 mass %, CuO below 3 mass % and MgO below 5.6 mass %. The most optimum option was the simultaneous presence of MoO <sub>3</sub>/MgO and CuO/MgO in the composition.