煅烧温度对纳米羟基磷灰石性能的影响

Influence of calcining temperature on crystal structure and morphology of hydroxyapatite nanopowders

目的探讨煅烧温度对羟基磷灰石结晶性能、晶粒尺寸、形貌的影响。方法以四水硝酸钙和五氧化二磷为原料，无水乙醇为溶剂，采用溶胶一凝胶法制备出羟基磷灰石（HAP）纳米粉体。利用X射线衍射分析（XRD）和红外光谱（FFIR）研究煅烧温度对羟基磷灰石结晶性能、晶粒尺寸、形貌的影响。采用扫描电镜（SEM）观察制备粉体的表面形貌和尺寸。结果500℃可初步形成结晶度不太高的HAP；650℃则晶化程度提高；到800℃时晶化程度更高。凝胶HAP经500℃煅烧后，颗粒以团聚为主，边界不清；650℃时结晶粒度大小为48nm，800℃时为78nm。结论采用溶胶凝胶法，650℃处理可得到结晶性能良好、分散均匀、50nm左右大小的羟基磷灰石粉体。煅烧温度对羟基磷灰石粉体的制备有重要影响，温度过低，晶化程度差，晶粒尺度小，提高煅烧温度有利于HAP晶化程度的提高。

Objective To evaluate the influence of calcining temperature on the crystallinity and morphology of hydroxyapatite powders. Methods Hydroxyapatite nanopowders were prepared by using a selgel process with phosphoric pentoxide（P2O5） and calcium nitrate tetrahydrate[ Ca（ NO3 ）2· 4H2O]. The influence of calcining temperature on the crystallinity and morphology of hydroxyapatite powders was studied by X-ray diffraction（ XRD）, fourier transform infrared spectroscopy （FTIR） and scanning electron microscope （SEM）. Results When the temperature was 650 ℃, HAP was the purest and the geanule size was 48 nm. While the temperature was 800 ℃, powder was the best and the geanule size was 78 nm. Conclusions Nano-hydroxyapatite powder prepared from Ca （NO3 ）2 · 4H2O and P2O5 with good crystallinity and the particles of hydroxyapatite powder are sphericity with diameter less than 50 nm when they are sintered at the temperature of 650 ℃.