Classical Bioglass® and innovative CaO-rich bioglass powders processed by Spark Plasma Sintering: A comparative study. Issue 15 (December 2015)

• Record Type: Journal Article
• Authors: Desogus, L.; Cuccu, A.; Montinaro, S.; Orrù, R.; Cao, G.; Bellucci, D.; Sola, A.; Cannillo, V.
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 15(2015:Dec.)
• Page Start: 4277
• Page End: 4285
• Publication Date: 2015-12
• Subjects: Bioactive glasses -- Powder characterization -- Spark Plasma Sintering -- Mechanical properties; 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.2015.07.023
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Densification and crystallization phenomena taking place when a recently developed CaO-rich bioactive glass and conventional 45S5 Bioglass ® are processed by Spark Plasma Sintering (SPS) are examined. Fully dense and wholly amorphous products can be obtained from the new glass composition at 730 °C after 2 min dwell time. Moreover, temperatures equal or higher than 830 °C are needed to induce crystallization (α- and β-CaSiO3 ) in the parent glass. Conversely, Na6 Ca3 Si6 O18 crystals are formed in sintered 45S5 samples produced under optimal conditions (550 °C, 2 min), although the glassy character is still preserved. Products resulting from the innovative glass powders generally display higher hardness and local elastic modulus. Devitrification also provides improvements in this system. In contrast, mechanical properties become slightly worsen when classical bioglass is processed at 600 °C. This can be probably associated to the corresponding decrease in compactness which, apparently, overcomes the benefits arising from the crystallization progress.