High temperature reactions between soda-lime-silica glass and lithium aluminosilicate glass-ceramics

摘要

High temperature interactions between a common lithium aluminosilicate glass-ceramic and soda-lime-silica container glass were studied in detail using scanning electron microscopy (SEM) and high temperature x-ray diffraction (HTXRD). The SEM images and qualitative energy dispersive spectroscopy (EDS) data show that, at temperatures between 1000 and 1200°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 the 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. Isothermal, in situ diffraction experiments from 950-1200°C show expected reactions, such as the formation of cristobalite as the glass devitrifies and the conversion of stuffed β-quartz to β-spodumene in the glass-ceramic. One notable observation is that in a system dominated by glass (as would be expected in a commercial melter), the expected transition of stuffed β-quartz to β-spodumene in the glass-ceramic is inhibited, presumably by the diffusion of Li into the glass.