超细磷酸锌钙粉体的制备与性能

采用正交实验设计,以Ca(OH)2,ZnO和H3PO4为原料,通过水热法合成出超细磷酸锌钙粉体.借助于动态光散射粒度分析仪、扫描电镜对产物的粒度和形貌进行分析表征,通过XRD图谱对反应机理进行研究,同时通过TG图谱对产物失水过程进行分析.实验结果表明:最佳反应条件是:Ca与Zn摩尔比n(Ca)∶n(Zn)=1∶2,反应温度为80℃,反应时间为12h,OP-10为表面活性剂:得到的产物颗粒大小均匀,粒度为1～2μm；最终产物CaZn2(PO4)2·2H2O是通过中间产物CaZn(OH)3]2·2H2O与磷酸反应而生成的.CaZn2(PO4)2·2H2O分子的失水过程分为2个阶段,第1阶段失水温度为95～393℃,第2阶段失水温度为403～553℃.

Preparation and properties of ultrafine CaZn2（PO4）2 powder

Based on the orthogonal experiment,ultrafine CaZn2(PO4)2 powder was prepared using calcium hydroxide,zinc oxide and phosphoric acid as main raw materials by hydrothermal reaction method.The particle size and morphologies of samples were characterized by DLS and SEM,the reaction mechanism was investigated by XRD,and the decomposition process of products was revealed with thermal analytical techniques.The results show that optimum reaction conditions are as follows.The molar ratio of reactant n(Ca):n(Zn) is 1:2,the reaction temperature is 80°C,the reaction time is 12 h,and the surfactant is OP?10.The diameter distribution of the product is homogeneous,and the average particle diameter is about 1~2 μm.The final product CaZn2(PO4)2·2H2O is synthesized by the intermediate production CaZn(OH)3]2·2H2O and phosphoric acid.The CaZn2(PO4)2·2H2O molecular is decomposed to CaZn2(PO4)2 in two dehydration reactions stage: the first stage of dehydration temperature is from 95 ℃ to 393 ℃,and the second stage of dehydration temperature is from 403 ℃ to 553 ℃.