摘要
Al2O3 ceramic powder was applied to modify the large pores defects on the surface of the porous metal Ti support,in situ oxidation method was a convenient method to prepare defect free ceramic/Ti composite membranes on this basis.In situ oxidation conditions experimental results show that the best condition for preparing the TiO2-Al2O3/Ti composite membrane is under 800°C for 2 h,and the microstructure and pore sizes of the TiO2-Al2O3/Ti composite membranes are affected obviously.The thickness and composition of the TiO2/Ti composite membranes are determined by SEM and XRD completely.The pore size distribution of the composite membrane is measured by bubble pressure method,the most probable aperture is about 3.12μm,while the average pore size of defect free TiO2-Al2O3/Ti is about 3.23μm.After ultrasonic treatment,the slight weight change of membranes reveals no observable change,which indicates that TiO2-Al2O3/Ti composite membranes maintain a good stability.
本文采用Al2O3陶瓷粉末对多孔金属Ti载体表面的大孔缺陷进行修饰,在此基础上采用原位氧化法制备了无缺陷陶瓷/Ti复合膜。结果表明,制备的陶瓷/Ti复合膜的最佳工艺条件为氧化温度800°C、氧化时间2 h,随着氧化温度升高和氧化时间的延长,陶瓷/Ti复合膜的表面结构和孔径发生明显变化。采用SEM和XRD测定了所制备陶瓷/Ti复合膜的表面形貌、膜厚度和组成变化。通过气体泡压法测量了复合膜的孔径分布,所制备的陶瓷/Ti复合膜的最可几孔径约为3.12μm,平均孔径约为3.23μm。经超声处理后,复合膜的质量无明显变化,表明所制备的陶瓷/Ti复合膜具有良好的稳定性。
基金
Projects(212006065,21666018)supported by the National Natural Science Foundation of China
