Crystallization study of sol–gel derived 13-93 bioactive glass powder
Crystallization study of sol–gel derived 13-93 bioactive glass powder
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DOI：
10.1016/j.jeurceramsoc.2020.09.052
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
Q. Nawaz;A. de Pablos-Martín;J. Martins de Souza e Silva;L. Berthold;K. Hurle;A. C. Contreras Jaimes;M. Sitarz;D. Brauer;A. Boccaccini
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文献类型：
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作者：
Q. Nawaz;A. de Pablos-Martín;J. Martins de Souza e Silva;L. Berthold;K. Hurle;A. C. Contreras Jaimes;M. Sitarz;D. Brauer;A. Boccaccini
采用溶胶-凝胶法制备了多组分硅酸盐生物活性玻璃（BG） （53SiO2‐20CaO‐6Na2O‐4P2O5‐12K2O‐5MgO, wt. %）（13-93组成）。采用差示扫描量热法（DSC）、x射线衍射法（XRD）、透射电子显微镜（TEM）和x射线纳米计算机断层扫描（nano-CT）评价热处理对结晶的影响。热处理的温度和时间对结晶相的形成有较大的影响。初步结果表明，通过控制热处理的温度和时间，可以将13-93 BG粉末的结晶度调整在5-43 wt. %范围内。在650°C和700°C两种不同温度下烧结30 min ~ 4 h，用透射电镜观察了粉末的微观结构。采用x射线纳米计算机断层扫描（nano-CT）对粉末形态样品中结晶区域的三维形貌和分布进行可视化。观察到玻璃转变和结晶温度之间的很大范围，这为直接制造3D结构（例如多孔支架）的合适材料提供了前景，而无需中间加工步骤。
Multicomponent silicate bioactive glass (BG) (53SiO2‐20CaO‐6Na2O‐4P2O5‐12K2O‐ 5MgO in wt. %) (13–93 composition) was prepared via the sol–gel process. The influence of thermal treatment on the crystallization was evaluated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray nano-computed tomography (nano-CT). The temperature and time of the thermal treatment strongly influenced the formation of the crystalline phases. The preliminary outcomes demonstrate the possibility of tailoring the crystallinity of 13–93 BG powder in the range 5–43 wt. % by controlling the temperature and time of the heat treatment. The microstructure of powders sintered at two different temperatures (650 °C and 700 °C from 30 min to 4 h) was evaluated by TEM. X-ray nano-computed tomography (nano-CT) was used to visualize the 3D morphology and distribution of crystallization areas in the samples in powder form. A large range between the glass transformation and the crystallization temperatures is observed, which provides the prospect of a suitable material to manufacture directly 3D structures (e.g. porous scaffolds) without an intermediate processing step.