Spark plasma sintered CaO-rich bioglass-derived glass-ceramics with different crystallinity ratios: A detailed investigation of their behaviour during biological tests in SBF. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Montinaro, S.; Luginina, M.; Garroni, S.; Orrù, R.; Delogu, F.; Bellucci, D.; Cannillo, V.; Cao, G.
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 1603
• Page End: 1612
• Publication Date: 2019-04
• Subjects: Spark plasma sintering -- Bioactive glasses -- Crystallization -- In-vitro test -- Rietveld analysis; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.12.003
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The in-vitro behaviour of three series of dense materials with different crystallization degree and phases produced by Spark Plasma Sintering (SPS) from CaO-rich bioglass powders is investigated by soaking them up to 14 days in Simulated Body Fluid (SBF). The completely amorphous materials produced after 2 min at 730 °C display the more pronounced substrate-solution interaction. This is highly beneficial for the rapid generation (<3 days) of an apatite layer on the substrate surface. Larger amounts of such phase are also produced during the entire immersion period. These characteristics are moderately mitigated when 80 wt.% of the glass is crystallized at 850 °C with the main formation of α-CaSiO3 . Nonetheless, more severe SPS conditions (1000 °C, 20 min) lead to specimens rich of β-CaSiO3 that still retain 12 wt.% of the amorphous nature while scarcely interact with SBF. The apatite formation is correspondingly delayed (7 days) and its amount significantly decreased.