Classical Bioglass (R) and innovative CaO-rich bioglass powders processed by Spark Plasma Sintering: A comparative study

摘要

Densification and crystallization phenomena taking place when a recently developed CaO-rich bioactive glass and conventional 45S5 Bioglass (R) 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 degrees C after 2 min dwell time. Moreover, temperatures equal or higher than 830 degrees C are needed to induce crystallization (alpha- and beta-CaSiO3) in the parent glass. Conversely, Na6Ca3Si6O18 crystals are formed in sintered 4555 samples produced under optimal conditions (550 degrees C, 2 min), although the glassy character is still preserved.