K. Morita et al., EFFECT OF MNO, CAO AND NITROGEN ON THE ALKALINE DURABILITY OF SODA LIME SILICATE-GLASSES, Journal of Materials Science, 29(24), 1994, pp. 6587-6591
MnO containing soda-lime silicate glasses were vitrified and nitrogen
was introduced into them. The prepared glasses were subject to density
measurement and alkaline durability tests. MnO addition caused poorer
alkaline durability in 2N NaOH solution at 82-degrees-C. Needle-like
precipitations were observed on the MnO containing glass surface after
96 h durability tests. Glass components were found to dissolve select
ively in the alkaline solution in the order SiO2 > CaO > MnO. The dens
ity of the obtained glasses increased linearly with increasing amount
of nitrogen content in the glasses. A considerable improvement in alka
line durability of the glasses by nitrogen addition was observed, and
its effect was larger for the MnO-free glasses.