Journal
ACTA BIOMATERIALIA
Volume 4, Issue 6, Pages 1894-1903Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2008.05.019
Keywords
Sintering; Phase transformations; Non-metallic glasses (silicates); Biomaterials; Porous material
Funding
- Region Rhone-Alpes (France)
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In this study, we report on the effect of Bioglass (R) structural transformations on its sintering behaviour. While heating up to 1000 degrees C, five successive transformations occur: glass transition, glass-in-glass phase separation, two crystallization processes and a second glass transition. The sintering of the material exhibits two main shrinkage stages associated with the two glass transitions at 550 and 850 C. At 580 degrees C, the glass-in-glass phase separation induces a decrease in the sintering rate immediately followed by the major crystalline phase crystallization (Na2CaSi2O6) between 600 and 700 degrees C, from the surface to the bulk of the particles. A complete inhibition of sintering takes place followed by a minor shrinkage effect due to crystallization. A plateau is then observed until the second glass transition temperature is reached. A modification of Frenkel's model allows the determination of the glass-in-glass phase separation kinetics and the identification of the structural transformations effects on sintering behaviour. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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