Pressureless spark plasma–sintered Bioglass®45S5 with enhanced mechanical properties and stress–induced new phase formation

0473639 - ÚFM 2018 RIV GB eng J - Článek v odborném periodiku
Bertolla, Luca - Dlouhý, Ivo - Tatarko, P. - Viani, A. - Mahajan, A. - Chlup, Zdeněk - Reece, M.J. - Boccaccini, A. R.
Pressureless spark plasma–sintered Bioglass®45S5 with enhanced mechanical properties and stress–induced new phase formation.
Journal of the European Ceramic Society. Roč. 37, č. 7 (2017), s. 2727-2736. ISSN 0955-2219. E-ISSN 1873-619X
Grant CEP: GA MŠMT LM2015069; GA ČR GA14-11234S; GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: Biomaterials * Bioglass * Spark plasma sintering * Mechanical propertiesa
Obor OECD: Ceramics
Impakt faktor: 3.794, rok: 2017

Commercial Bioglass® 45S5 powder was sintered using spark plasma sintering (SPS) technique without the assistance of mechanical pressure with heating and cooling rate of 100 °C/min, dwell temperature of 1050 °C and dwell time of 30 min. Such route enabled the production of samples exhibiting superior mechanical properties in comparison with Bioglass® sintered in furnace. In particular, flexural strength and fracture toughness reached values close to those of apatite-wollastonite bioceramics, already widely used in clinical applications. The residual stresses implemented by indentation promoted the formation of a new phase in samples sintered by SPS. Complementary use of Raman and energy dispersive spectroscopy (EDS) indicated the phase as sodium carbide and a formation mechanism was proposed.
Trvalý link: http://hdl.handle.net/11104/0271345