کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1527946 | 1511864 | 2006 | 9 صفحه PDF | دانلود رایگان |
The bioactive glass of composition 53SiO2–6Na2O–22CaO–11K2O–5MgO–2P2O5–1B2O3 (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 = afN. 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).
Journal: Materials Chemistry and Physics - Volume 96, Issues 2–3, 10 April 2006, Pages 409–417