生物活性β-硅酸二钙的喷雾干燥–微波快速烧结制备与性能表征(英文)

PREPARATION AND CHARACTERIZATION OF BIOACTIVE BETA-DICALCIUM SILICATE CERAMICS SYNTHESIZED BY THE SPRAY DRYING–FAST MICROWAVE SINTERING PROCESS

将微波烧结工艺与喷雾干燥技术相结合,成功探索了一种制备β-Ca2SiO4陶瓷的新工艺,考察了制备的β-Ca2SiO4陶瓷的生物活性。用扫描电子显微镜、X射线衍射和红外光谱分析对前驱体和β-Ca2SiO4陶瓷进行了表征。结果表明:前驱体为四水硝酸钙、硝酸钙及硅溶胶的混合物,由80～300nm的粒子团聚而成;新工艺制备的β-Ca2SiO4陶瓷可在30min内于900℃烧成,并且不发生β→γ的相变。通过模拟体液浸泡实验考察了制备的β-Ca2SiO4陶瓷的生物活性,结果表明:制备的β-Ca2SiO4陶瓷,通过模拟体液浸泡可在72h内诱导类骨磷灰石沉积在表面,显示出良好的生物活性。由此得出结论:采用喷雾干燥-微波烧结工艺制备β-Ca2SiO4陶瓷,与传统工艺相比,能显著降低烧结温度,缩短烧结所需时间,并且制备的β-Ca2SiO4陶瓷具有良好的生物活性。

Beta-dicalcium silicate（β-Ca2SiO4） ceramics were prepared successfully by combining the fast microwave–sintering technique and spray-drying technique,and the bioactivity of the as-prepared ceramics was investigated. The precursor and β-Ca2SiO4 ceramics were characterized by the scanning electron microscope,X-ray diffraction and Fourier transform infrared spectroscopy techniques. The results indicate that the precursor is composed of calcium nitrate tetrahydrate,calcium nitrate and aqueous sol of SiO2 and is aggregated by particles with diameters of around 80-300 nm. The β-Ca2SiO4 ceramics can be prepared within 30 min at 900 ℃ using the novel method. No phase transformation from β- to γ-phase occurs in the as-prepared ceramics. The bioactivity of the β-Ca2SiO4 ceramics was investigated by the simulated body fluid （SBF） soaking test. It is found that the bone-like apatite is precipitated on the surface of the ceramics soaked in SBF within 72 h. The results indicate that the β-Ca2SiO4 ceramics possess good bioactivity. In conclusion, bioactive β-Ca2SiO4 ceramics can be prepared by the spray drying-fast microwave sintering process at a lower temperature and in a shorter time than by the conventional method, and the as-prepared ceramics possess good bioactivity,