水热法合成羟基磷灰石晶须

Synthesis of hydroxyapatite whisker by hydrothermal method

羟基磷灰石(HA)晶须具有较低的位错密度,较高的抗拉性能,可用作生物陶瓷的增韧材料。实验以碳酸钙和磷酸氢钙为原料,通过水热法合成了结晶度较高、晶粒完整的HA晶须。借助XRD,SEM及FT-IR分析了HA的晶相组成、形貌、结构,此外借助粒度及ζ电位分析仪测试了产物的ζ电位和粒度分布。研究结果表明:水热温度的提高更有助于晶体沿c轴方向生长;在220℃反应10 h,得到端面直径0.8μm、长6μm的HA晶须;并有少量碳酸根进入磷灰石结构;HA在乙二醇中的分散效果比在水中更均匀、稳定,粉体的平均粒度约2μm。

Hydroxyapatite （ HA） whisker has lower dislocation density and higher tensile strength, therefore it could be used as toughening material in bioceramic. In this experiment, HA whisker with high crystallinity and uniform size was synthesized under hydrothermal condition by using CaCO3 and CaHPO4 ·2H2O as raw materials. The phases, crystal appearance and chemical composition were analyzed by XRD, SEM and FF- IR respectively. In addition, the ζ potential and size distribution of HA were also tested by nano - zetasizer. The results show that increasing temperature benefits HA whisker growing along c axis direction,and HA whisker synthesized at 20℃ for 10 h possesses section diameter of 0.8 μm and length of 6μm with some CO3^2- entering its structure; HA could be dispersed in glycol more uniformly and stably than in water, and its average size is about 2μm.