陈化时间对磷酸三钙固体性能的影响

Influence of Aging Time on the Solid Performance of Tricalcium Phosphate

研究了不同陈化时间下,磷酸三钙粒子的结晶度、形态特征以及粒度分布。采用X射线衍射仪测定了磷酸三钙的结晶度,用扫描电镜观测了磷酸三钙的外观形貌,并用马尔文粒度分析仪测定产物的粒度分布。实验表明:沉淀反应首先析出的是无定型沉淀物,陈化过程中发生晶化转变为晶型产品;无定型磷酸三钙转化为晶型磷酸三钙的过程中,通常伴随着溶液pH值的微微下降;SEM图可看出,产品最终形貌为片状聚集状态;随着陈化时间的增加,小颗粒逐渐溶解大颗粒逐渐长大,粒度分布变窄。

The effect of aging time on the solid performances of tricalcium phosphate was investigated by using XRD to identify the degree of crystallinity, and SEM to observe the crystal morphology. The Malvern particle size analyzer was also applied to measure the distribution of the particle size of tricalcium phosphate. It is found that the amourphous precipitation is initially produced, and then transforms to the crystal product during the aging process. The crystallization of calcium phosphates into crystalline tricalcium phosphate is accompanied with a slight decrease of the pH of the solution. According to the SEM image, the final morphology of the product is flake like aggregated crystals; with the increasing of aging time, small particles gradually dissolve, and larger particles gradually grow up, which leads to an arrow particle size distribution.