Devitrification study of a novel bioactive glass designed on the CaSiO3 – Ca3(PO4)2 – MgCa(SiO3)2 system

The thermal evolution of a vitreous biomaterial based on the CaSiO3 – Ca3(PO4)2 – MgCa(SiO3)2 system has been studied. The crystallization kinetics and the devitrification capability were analyzed using Differential Thermal Analysis and X- ray diffraction. Powders with two different particle sizes (300–500 µm and <45 µm) were used for kinetic studies applying Kissinger‘s equation with similar results for both materials. Also, Johnson-Mehl-Avrami method applicability was evaluated using Málek´s test. By thermal devitrification evolution, it has been observed a successive precipitation of five crystalline phases between 600–1290 °C: pseudowollastonite, hydroxyapatite and wollastonite beginning at ~700 °C; diopside beginning at 900 °C and β – tricalcium phosphate from 1150 °C. It was found that it is possible to obtain a wide range of bio-glass-ceramics, with different crystalline phases through appropriate design of thermal treatments. © 2019 Elsevier B.V.