Al2O3陶瓷膜支撑体制备方案的优化探究

Preparation and Optimization of Aluminum Oxides Ceramic Membrane Supports

以α-Al2O3为骨料,选取造孔剂羧甲基纤维素、复相烧结助剂二氧化钛和氧化铜、润滑剂丙三醇四种工艺因素的加入量,设计L25（54）正交实验,在1200℃温度下烧结制备支撑体,从而得到最佳制备方案。通过测定每组实验所制备支撑体的孔隙率和抗折强度,得到各添加剂对孔隙率和抗折强度影响程度的主次顺序是造孔剂〉润滑剂〉复相烧结助剂。采用压汞仪、万能材料试验机、扫描电镜和实验室自制装置等实验设备对成品进行表征量的测试。结果表明：羧甲基纤维素、丙三醇、二氧化钛＋氧化铜的最佳添加量分别为4%、3%和1.5%＋3%,在该最佳配比下制备的支撑体孔隙率可达33%,纯水通量5107.68 L/m2·h·MPa,抗折强度104.4 MPa,微观结构良好。

The L25（54） orthogonal experiment was designed by selecting α-Al2O3 as the aggregate and the addition of four process factors that is pore-forming agent carboxymethyl cellulose, multi-phase sintering auxiliaries titanium dioxide and copper oxide, lubricants glycerol and the support was sintered at 1200 ℃ to obtain the best preparation scheme. By determining the porosity and flexural strength of the supports prepared in each group of experiments, the order of the effect of each additive on porosity and flexural strength was pore-forming agent〉 lubricant〉 complex phase sintering aid. The characterization of finished products was carried out by means of mercury injection apparatus, universal material testing machine, scanning electron microscope and laboratory equipment. As a result, optimum additions of carboxymethyl cellulose, glycerol, titania ＋ copper oxide were 4%, 3% and 1.5% ＋ 3%, respectively. Under the optimum ratio, the support has the porosity of 33%, the pure water flux of 5107.68 L/m2·h·MPa, the flexural strength of 104.4 MP and the microstructure of well.