压力对均相共沉淀法制备羟基磷灰石晶体形貌的影响  

Effect of pressure on morphology of hydroxyapatite prepared by homogeneous co-precipitation method

作　　者：黄志良[1] 罗晶[1] 陈常连[1] 夏浩孚[1] 孟鹏[1] 夏俊杰[1] 罗马亚 李波[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2014年第11期43-47,共5页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金项目(51374155);湖北省科技支撑计划项目(2014BCB034);湖北省自然科学基金项目(2014CFB796)

摘　　要：以硝酸钙、磷酸氢二铵混合水溶液为原料、以尿素为缓冲剂,采用均相共沉淀法制备羟基磷灰石晶体,并通过X射线衍射、扫描式电子显微镜、透射电子显微镜等3种分析方法对样品分别进行了物相组成、晶体形貌、晶体取向的表征,研究了不同压力对羟基磷灰石晶体形貌的影响.结果表明:当反应压力从0.11 MPa增加至1.1 MPa时,所得羟基磷灰石晶体的物相组成由含有羟基磷灰石和磷酸八钙两种物相向只含有羟基磷灰石一种物相过渡;所得羟基磷灰石晶体的形貌从针状晶须(经由长板状和六方柱状)向薄片状晶体进行过渡;所得羟基磷灰石晶体的生长取向由沿一个方向(c轴)生长向沿另外两个方向(a轴和b轴)生长转变.Hydroxyapatite crystal was prepared by homogeneous co‐precipitation method using a mixture of Calcium nitrate and diammonium phosphate as raw materials and carbamide as buffering agent .To analyze the influence of pressure on hydroxyapatite crystal morphology ,the phase composition ,crystal morphology and growth orientation were characterized by X‐ray diffraction ,scanning electron micro‐scope and transmission electron microscope respectively .T he results show that w hen the reaction pres‐sure increases from 0 .11 M Pa to 1 .1 M Pa ,the phase composition of the hydroxyapatite crystals trans‐forms from the two phases of hydroxyapatite and eight calcium phosphate to hydroxyapatite single crys‐tal;the morphology of the hydroxyapatite crystals transforms from acicular crystal whisker （via long plate shape and hexagonal prism shape ） to lamelliform crystal ; the grow th orientation of the hydroxyapatite crystals changes from growing along one dimension （c axis） to growing along the others two dimensions （a axis and b axis） .

关 键 词：羟基磷灰石 均相沉淀法 压力 物相 形貌 生长方向 

分 类 号：TB321[一般工业技术—材料科学与工程]