磷酸钙料浆性质对雾化干燥羟基磷灰石微球的影响

摘要

以甲烷火焰为干燥介质,将3种不同性质的磷酸钙料浆利用火焰-雾化干燥法制备出不同形态和性能的羟基磷灰石(HA)微球.对比分析了料浆成分、温度、结晶程度等参数对所得HA微球形貌、相组成、结晶度、比表面积以及孔隙分布等的影响.结果表明,料浆中的氨水在雾化干燥过程中会聚集突释,得到具有“爆破状”开口的形态的HA微球.低温并且结晶程度较低的磷酸钙料浆经过火焰-雾化快速干燥后,得到结构松散、结晶度较低、比表面积及孔体积较大的HA微球,说明料浆的性质将会直接影响火焰-雾化干燥后HA微球的特性.%Three kinds of HA microspheres were fabricated through different calcium phosphate (CaP) slurries by a flame-drying method using methane flame. The effect of component, temperature, crystallinity of CaP slurry was studied on the morphology, phase composition, crystiallinity, surface area and porosity of HA microspheres. The results showed that ammonia contented in the HA slurry was assembled and broken-out during the flame-drying process, resulting in HA microspheres with burst-like structure. HA microspheres with loose structure, poor crystallinity, large surface area and porosity were fabricated through low temperature and poor crystalline HA slurries using a flame-drying method. It demonstrated that the properties of CaP slurry would directly influence the characteristics of HA microspheres fabricated by this method.