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Crystallization of experimental bioactive glass compositions
A S Rizkalla1, D W Jones, D B Clarke
1Division of Biomaterials Faculties of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
Journal of Biomedical Materials Research
|September 1, 1996
Summary
This study investigated crystallization kinetics in six Na2O-CaO-SiO2-P2O5 glasses. Activation energy of crystallization correlated with composition and Young
Area of Science:
- Materials Science
- Ceramics
- Biomaterials
Background:
- The Na2O-CaO-SiO2-P2O5 glass system is relevant for biomaterials.
- Understanding crystallization kinetics is crucial for controlling glass-ceramic properties.
Purpose of the Study:
- To investigate the crystallization kinetics of six experimental Na2O-CaO-SiO2-P2O5 glass formulations.
- To determine the activation energy of crystallization (Q) for different glass compositions.
- To explore correlations between crystallization kinetics, composition, and mechanical properties.
Main Methods:
- Synthesis of six glass formulations using wet chemistry.
- Differential thermal analysis (DTA) to study crystallization kinetics.
- X-ray diffraction (XRD) to identify crystalline phases.
Main Results:
- Activation energy of crystallization (Q) ranged from 196 to 782 kJ/mole.
- Significant correlations were found between Q, CaO/P2O5 ratio, and Young's modulus.
- Crystalline phases identified include wollastonite, Na2CaSi3O9, and combeite; some samples showed bulk crystallization or unidentifiable phases.
Conclusions:
- Glass composition significantly influences crystallization kinetics and activation energy.
- Young's modulus is linked to crystallization behavior in these glasses.
- The study provides insights into controlling phase formation and properties in Na2O-CaO-SiO2-P2O5 glass-ceramics.