The effect of heat treatment on the microstructure of Li,OAl2O3-SiO2 glass-ceramics which contain crystals of either Li2Si03, Li2Si,05, or both was investigated quantitatively. Strength determinations for abraded rods were correlated with heat treatment on the basis of both size and distribution of crystals and the type and amount of crystal phases present. The presence of Li2Si205 crystals enhanced the strength, whereas the presence of Li2Si03 crystals did not change the strength of the abraded parent glass. The interrelation between strength and microstructure is discussed.
Chemical bonding, a requirement for adherence, is developed at glass‐metal interfaces by achieving and maintaining equilibrium compositions at the interfaces. Reactions between iron and glasses with and without “adherence oxides” were studied by thermogravimetry, optical microscopy, and electron probe microanalysis. Adherence oxides result in the formation of alloys at the interface that tend to maintain equilibrium with the adjoining glass over an extended time and enhance atmospheric oxidation of the metal. The occurrence of dendrites in the bulk glass and the function of a “nickel flash” in porcelain enameling are discussed in terms of these reactions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.