黄土基陶瓷膜支撑体制备方案的优化探究

Optimization of Preparation Scheme of Loess-based Ceramic Membrane Support

以中值粒径为32.78μm的纯黄土为骨料,选取增韧剂钇稳定氧化锆(YSZ)、造孔剂羧甲基纤维素(CMC)、烧结助剂氧化铜(CuO),设计三因素五水平L25(53)正交试验,在1030℃下烧结制备支撑体,保温2 h。对支撑体的热稳定性、晶相组成、表面形貌、孔结构、断裂韧性、抗折强度、酸碱腐蚀及水通量等进行表征,探究各因素对支撑体性能影响先后顺序。结果表明:采用正交试验确定最优方案YSZ、CMC、CuO添加量分别为10 wt%、4 wt%、1.5 wt%,支撑体的抗折强度为47.19 MPa,纯水通量为2590.02 L/(m^2·h·bar),维氏硬度为124.56 MPa,断裂韧性为0.43 MPa·m^1/2,酸碱腐蚀率为0.0196/0.013。

The L25(53)orthogonal experiment was designed by selecting the pure loess as the aggregate and the addition of three process factors that is the toughening agent yttria stabilized zirconia(YSZ),the pore former carboxymethyl cellulose(CMC),the sintering aid copper oxide(CuO)and the support was sintered at 1200℃to obtain the best preparation scheme,heat preservation for 2 h.The thermal stability,crystal phase composition,surface morphology,pore structure,fracture toughness,flexural strength,acid-base corrosion and water flux of the support were characterized,and the order of influence of various factors on the performance of the support was investigated.The results show that the optimum dosages of YSZ,CMC and CuO are 10 wt%,4 wt%and 1.5 wt%,the flexural strength of the support is 47.19 MPa,and the pure water flux is 2590.02L/(m^2·h·bar),Vickers hardness of 124.56 MPa,fracture toughness of 0.43 MPa·m^1/2,acid-base corrosion rate of 0.0196/0.013.