Effect of thermal treatment on physical properties of bioactive glass

• Published in: Materials chemistry and physics Vol. 96; no. 2; pp. 409 - 417
• Main Authors: Begum, A. Nishara, Rajendran, V., Ylänen, Heimo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10.04.2006
• Subjects: Bioactive glasses; Bioactivity; Elastic properties; Thermal treatments; Ultrasonic measurements; Thermal treatments; Bioactivity; Ultrasonic measurements; Elastic properties; Bioactive glasses
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2005.07.031

The bioactive glass of composition 53SiO 2–6Na 2O–22CaO–11K 2O–5MgO–2P 2O 5–1B 2O 3 (1–98) has been prepared using the melt method. The ultrasonic velocities, attenuation and elastic properties measurements have been made operated at a fundamental frequency of 5 MHz at room temperature on bioactive glass 1–98 before and after different thermal treatment conditions. Further, the frequency dependence of the attenuation was fitted into a linear relation α = af N . The observed linear increase in velocities, density and elastic properties of bioactive glass as a function of thermal treatment temperature, indicates that the densification in bioactive glass is due to the change in network bond per unit volume and not due to the structural/cross-linkage changes. Thus, thermal treatments of bioactive glasses lead to changes in elastic properties of bioactive glass. Furthermore, a long-term thermal treatment at higher temperatures also seemed to cause such changes to the glass surface that the formation of Ca,P-layer was inhibited during a 48 h immersion in simulated body fluid (SBF).