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Sintering and crystallisation of 45S5 Bioglass® powder

Lookup NU author(s): Dr Oana Bretcanu


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The sintering process of 45S5 Bioglass® powder (mean particle size < 5 μm) was investigated by using different thermal analysis methods. Heating microscopy and conventional dilatometry techniques showed that bioactive glass sinters in two major steps: a short stage in the temperature range 500–600 °C and a longer stage in the range 850–1100 °C. The optimal sintering temperature and time were found to be 1050 °C and 140 min, respectively. Differential thermal analysis (DTA) showed that Bioglass® crystallises at temperatures between 600 and 750 °C. The characteristic crystalline phases were identified by Fourier Transformed Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and X-Ray Diffraction (XRD). The crystallisation kinetics was studied by DTA, using a non-isothermal method. The Kissinger plot for Bioglass® powder heated at different heating rates between 5 and 30 °C/min yielded an activation energy of 316 kJ/mol. The average value of Avrami parameter determined using the Augis–Bennett method was 0.95 ± 0.10, confirming a surface crystallisation mechanism. After sintering at 1050 °C for 140 min, the main crystalline phase was found to be Na2Ca2Si3O9. The results of this work are useful for the design of the sintering/crystallisation heat treatment of Bioglass® powder which is used for fabricating tissue engineering scaffolds with varying degree of bioactivity.

Publication metadata

Author(s): Bretcanu O, Chatzistavrou X, Paraskevopoulos K, Conradt R, Thompson I, Boccaccini AR

Publication type: Article

Publication status: Published

Journal: Journal of the European Ceramic Society

Year: 2009

Volume: 29

Issue: 16

Pages: 3299-3306

ISSN (print): 0955-2219

ISSN (electronic): 1873-619X

Publisher: Elsevier Ltd


DOI: 10.1016/j.jeurceramsoc.2009.06.035


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