水热处理对共沉淀法制备羟基磷灰石晶粒尺寸的影响  

EFFECT OF HYDROTHERMAL TREATMENT ON GRAIN SIZE OF HYDROXYAPATITE PREPARED BY CO-PRECIPITATION

作　　者：杨辉[1] 张林[2] 徐可为[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]陕西科技大学生命科学与工程学院,陕西咸阳712081

出　　处：《硅酸盐学报》2007年第1期6-9,共4页Journal of The Chinese Ceramic Society

基　　金：西安市科技局重点技术攻关(GG200354);陕西省2004年自然科学基金(2004B24);陕西科技大学B类科技创新团队经费(sust–B104)资助项目。

摘　　要：以硝酸钙和磷酸氢二氨为原料,以NH4+–NH3·H2O为缓冲体系控制pH为11.0,在40,70℃,采用共沉淀法合成了羟基磷灰石(hydroxyapatite,HAP)。研究了120℃水热处理控制氨水快速挥发对HAP的晶粒尺寸和形貌的影响。采用X射线衍射分析HAP晶粒尺寸,透射电镜分析HAP的晶体表面形貌。结果表明:经水热处理后,40℃合成的HAP晶粒变大,而在70℃合成的HAP晶粒变小。HAP合成后,先静置再水热处理可得到更小的晶体。氨浓度对水热处理后HAP的晶粒尺寸影响不大。在上述各种制备条件下得到了分散性较好的棒状HAP纳米颗粒。Calcium nitrate Ca（NO3）2 and ammonium hydrogen phosphate （NH4）2HPO4 as reactants, hydroxyapatite （HAP） was synthesized by co-precipitation under the conditions of pH 11.0, and at 40℃ or 70 ℃. Then the ammonia in the solution of the reaction was rapidly evaporated at about 120℃ by controlling the pressure of the reaction tank. The microstructure and the morphology of HAP were characterized using X-ray diffraction and transmission electron microscope. The results show that the crystal size of the HAP prepared at 40℃ is enlarged while the crystal size of the HAP synthesized at 70℃ is reduced during the rapid evaporation of ammonia. The nanoscaled particles of HAP at various conditions above are rod-like in shape with well dispersity.

关 键 词：羟基磷灰石 共沉淀法 水热处理 

分 类 号：TQ174[化学工程—陶瓷工业]