低温制备片状磷灰石生物陶瓷

Fabrication of Plate-Like Apatite Bioceramic at Low Temperature

采用磷酸缓冲溶液浸泡法在37℃制备了碳酸根型磷灰石,借助XRD,FTIR,SEM,DSC-TG等分析手段研究了磷灰石的形貌、结构、热稳定性以及形成机理。结果表明,碳酸钙浸泡到磷酸缓冲溶液后,碳酸钙表面部分溶解,然后沉积上一层具有低结晶度的片状磷灰石;磷灰石的转化率,随磷酸缓冲溶液浸泡时间的延长而提高,但转化速率随之下降;磷灰石降低了残留碳酸钙的热稳定性,DSC的吸热峰从810℃迁移到755℃。预计制备的磷灰石可应用于骨支架材料或填充材料。

Plate-like carbonate apatite was prepared from calcium carbonate soaking in a phosphate buffer solution at 37 ℃. The morphology, microstructure, and thermal stability of samples were characterized by X-ray diffraction （XRD）, Fourier-transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, and thermogravimetry-differential scanning calorimetry （TG-DSC）. The results show that after soaking in the phosphate buffer solution, calcium ions are dissolved from calcium carbonate particles, and a layer of plate-like apatite with low crystallinity is precipitated on the surface. The conversion percentage of apatite increases with increasing the soaking time, while the conversion rate decreases. The presence of apatite reduces the thermal stability of calcium carbonate, resulting in the transference of endothermic peak from 810 ℃ to 755 ℃ in DSC profile. The obtained carbonate apatite could be used as a biomaterial for artificial bone substitution or bone cavity filling.