Influence of Alteration Solutions on the Chemical Durability of the Zerodur Glass-Ceramic: Structural Investigation
Résumé
The Zerodur© glass-ceramic chemical durability has been studied by leaching. The nuclear magnetic resonance spectroscopy analysis has allowed highlighting the network changes. A macroscopic evaluation of the surface alteration has been performed by contact angle measurements, this analysis being sensible to the roughness and the hydrophilic character. In basic solutions, depolymerization phenomena concern all former cations, as result of hydrolysis phenomena. A preferential attack of the interface matrix-nanocrystals, implicating phosphorus involves some nanocrystals removing. The Zerodur© glass-ceramic keeps an excellent chemical durability during exposition to acidic aqueous solutions. But in basic medium, the biphasic nature involves a strong alteration.