Abstract
It is difficult to prepare gels of the binary Na 2OSiO 2 system because the presence of OH − ions promotes quick and controlled gellation. A reproducible method for obtaining monolithic gel samples of 33 mol% Na 2O-67 mol% SiO 2 (33N) is described based upon hydration and polycondensation reactions of SiO(CH 3) 4 and NaOCH 3. Conversion of the dried gels to glasses and glass-ceramics is followed by the evolution of physicochemical properties and by comparing infrared reflection structural features of the gel-derived glasses with conventional melt-derived glasses. Densification in gel-glass transformation in the range from 490–520°C produces non-porous glass monoliths with density and structure equivalent to melt-derived 33N glasses. At higher temperatures (520°C) uncontrolled crystallization occurs.
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.
