کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1465197 | 989684 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of spherical shape borate-based bioactive glass powders prepared by ultrasonic spray pyrolysis Synthesis of spherical shape borate-based bioactive glass powders prepared by ultrasonic spray pyrolysis](/preview/png/1465197.png)
Spherical shape borate-based bioactive glass powders with fine size were directly prepared by high temperature spray pyrolysis. The powders prepared at temperatures between 1200 and 1400 °C had mixed phase with small amounts of fine crystal and an amorphous rich phase. Glass powders with amorphous phase were prepared at a temperature of 1500 °C. The mean size of the glass powders prepared by spray pyrolysis was 0.76 μm. The glass powders prepared at a temperature of 1200 °C had two distinct exothermic peaks (Tc1 and Tc2) at temperatures of 588 and 695 °C indicating crystallization. The glass transition temperature (Tg) of the powders prepared at a temperature of 1200 °C was 480 °C. Phase-separated crystalline phases with spherical shape were observed from the surface of the pellet sintered at a temperature of 550 °C. Crystallization of the pellet was completely occurred at temperatures of 750 and 800 °C. The pellets sintered at temperatures below 700 °C had single crystalline phase of CaNa3B5O10. The pellet sintered at a temperature of 800 °C had two crystalline phases of CaNa3B5O10 and CaB2O4.
Journal: Ceramics International - Volume 35, Issue 6, August 2009, Pages 2103–2109