Abstract
The kinetics of hydration of CaO-Al2O3-P2O5 and Na2O-CaO-B2O3-Al2O3 glasses in an autoclave at high temperatures and pressures have been investigated. A linear time dependence of the depth of hydrated layer has been found for the glasses used in the present study. This implies that the hydration process is governed by the chemical reaction at the interface between the unhydrated and the hydrated glass phases. It is indicated that the hydration of the phosphate glasses may occur as a result of hydrolysis of glass constituents to form orthophosphate crystals. Water vapour can easily reach the interface through the crystalline aggregates, which are loosely packed. Cabal glasses which do not contain any alkali oxides have shown quite a high resistance to water. Substitution of sodium for calcium has resulted in deterioration of the chemical durability of cabal glasses. This can be explained by the difference in stability between sodium and calcium ions in the hydrated layer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
