Biosilicate® Glass-Ceramic Foams From Refined Alkali Activation and Gel Casting
Bernardo E, Elsayed H, Romero AR, Crovace MC, Zanotto ED, Fey T (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 7
Article Number: 588789
DOI: 10.3389/fmats.2020.588789
Abstract
Biosilicate® glass-ceramics are among the most valid alternatives to 45S5 Bioglass. They combine a similar bioactivity and bioresorbability as the 45S5 with superior mechanical strength, owing to the crystallization of a Na–Ca silicate phase. This crystallization may be experienced upon viscous flow sintering of fine glass powders, thus configuring a sinter-crystallization process. As crystallization is seldom complete, sintering can also be applied to semicrystalline powders. The sintering/crystallization combination may be exploited for shaping highly porous bodies, to be used as scaffolds for bone tissue engineering, in the form of foams. The present study aims at exploring a gel-casting process, based on the room temperature foaming of powders suspended in a “weakly alkaline” (1 M NaOH) aqueous solution, followed by sintering at 1,000°C. The gelation of suspensions is attributed to the formation of hydrated compounds, later decomposed upon firing. Amorphous powders provided more intense gelation than semicrystalline ones, promoted a more homogeneous foaming, and stimulated a substantial crystallization upon firing. The homogeneity of foamed samples was assessed using micro-tomography and was further improved by casting foamed suspensions (“foam casting”) before setting.
Authors with CRIS profile
Involved external institutions
University of Padua / Universita degli Studi di Padova
Italy (IT)
Universidade Federal de São Carlos (UFSCar) / Federal University of São Carlos
Brazil (BR)
Italy (IT)
Universidade Federal de São Carlos (UFSCar) / Federal University of São Carlos
Brazil (BR)
How to cite
APA:
Bernardo, E., Elsayed, H., Romero, A.R., Crovace, M.C., Zanotto, E.D., & Fey, T. (2021). Biosilicate® Glass-Ceramic Foams From Refined Alkali Activation and Gel Casting. Frontiers in Materials, 7. https://dx.doi.org/10.3389/fmats.2020.588789
MLA:
Bernardo, Enrico, et al. "Biosilicate® Glass-Ceramic Foams From Refined Alkali Activation and Gel Casting." Frontiers in Materials 7 (2021).
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