Abstract
The electron microprobe has proven to be a powerful analytical tool for studying the complex reactions which occur when a glaze is fired onto a glass-ceramic body. Both the complexity of the reactions and the capabilities of microprobe analysis are demonstrated by a study of the interface between a single glaze applied to different glass-ceramic bodies. An automated electron microprobe forms the backbone of our analytical system. This instrument is interfaced to a computer for data accumulation, conversion and presentation. Several operating procedures have been developed and employed which are particularly suited to glass analysis. Application of a lead-borosilicate glaze to glass-ceramic bodies of different composition results in distinctly different interface reactions. In one case simple diffusion of cations occurs to form a gradual transition between the two compositions. Firing this same glaze onto a different glass-ceramic results in formation of an intermediate crystalline phase. Formation of this new phase creates abrupt composition changes which are not moderated by cation diffusion. These abrupt composition changes can create abrupt changes in properties such as strength and coefficient of thermal expansion, resulting in poor bonding between the glaze and glass-ceramic.
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