High temperature interactions between a common lithium aluminosilicate glass ceramic and soda-lime-silica container glass were studied in detail using SEM and high temperature X-ray diffraction. The SEM images and qualitative energy dispersive spectroscopy data show that, at temperatures between 1000-1200 deg C, a complex set of reaction layers of variable composition and morphology form at the boundary between the two materials. Na diffuses rapidly from the glass into the glass-ceramic, probably as an ion exchange reaction with the Li in he glass-ceramic. Ca diffuses from the glass into the glass-ceramic at a much slower rate, coinciding with the onset of incongruent melting of the glass-ceramic and mechanical weakening of the glass-ceramic surface.
