B-doped hardystonite bioceramics from preceramic polymers and fillers: Synthesis and application to foams and 3D-printed scaffolds. Issue 4 (April 2017)

• Record Type: Journal Article
• Authors: Elsayed, Hamada; Sinico, Mirko; Secco, Michele; Zorzi, Federico; Colombo, Paolo; Bernardo, Enrico
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 4(2017)
• Page Start: 1757
• Page End: 1767
• Publication Date: 2017-04
• Subjects: Hardystonite bioceramics -- Polymer-derived silicates -- Scaffolds -- Direct ink writing; 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.2016.12.002
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Highly porous hardystonite-based bioceramics, in the form of foams and 3D scaffolds, were obtained by the thermal treatment, in air, of silicone resins and engineered micro-sized oxide fillers. Besides CaO and ZnO precursors (CaCO3 and ZnO powders), calcium borate, in both hydrated and anhydrous form (Ca2 B6 O11 ·5H2 O and Ca2 B6 O11, respectively), was added to commercial silicone resins, with a significant impact on the microstructural evolution. In hydrated form, calcium borate led to a substantial foaming of silicone-based mixtures, at low temperature (420 °C); after dehydration, upon firing, the salt provided a liquid phase, favouring ionic interdiffusion, with the development of novel B-contaning hardystonite-based solid solutions (Ca2 Zn1-x B2x Si2-x O7 ). Although fired at lower temperature than previously developed silicone-derived hardystonite cellular ceramics (950 °C, instead of 1200 °C), the newly obtained foams and scaffold exhibit substantial improvements in the mechanical properties.