烧结制度对黄土/粉煤灰基陶瓷膜支撑体性能的影响

Effect of Sintering System on Performance of Loess/Powder Ash Base Ceramic Membrane Support

在膜技术研发中,黄土/粉煤灰基陶瓷膜支撑体能够较好满足水处理工艺的低成本材料开发和高附加值应用需求。采用扫描电镜(SEM)、X射线衍射(XRD)、热重分析(TG-DTG)等设备和方法,研究烧结温度、保温时间等烧结制度指标对支撑体宏观性能(水通量、抗折强度、酸碱腐蚀率等)和微观性能(微观断面、物相变化、热效应等)的影响。研究发现:1)烧结过程中,烧结温度的升高对支撑体的水通量呈负向影响,最低达到2166.18 L·(m^(2)·h·MPa);对抗折强度呈正向影响,最高达到50.03 MPa;烧结过程中形成了Mn_(2)AlO_(4)和Al_(2)(SiO_(4))O等微观晶型,能够有效提高支撑体的力学性能。2)当烧结温度为1050℃、保温时间为3 h时,支撑体的宏观形态较为平整,晶粒间形成颈部连结,水通量、抗折强度、酸碱腐蚀率等均维持在较高水平。

In the R&D of membrane technology,loess/powder ash based ceramic membrane support can better meet the needs of low cost material development and high value added application of water treatment process.Equipment and methods such as Scanning Electron Microscope(SEM),X-Ray Diffraction(XRD)and thermogravimetric analysis(TG-DTG)were used to study the influence of sintering system indexes such as sintering temperature and temperature holding time on the macro-performance(water flux,flexural strength,acid-base corrosion rate,etc.)and micro-performance(micro-section,phase change,thermal effect,etc.)of the support.The results show:1)During the sintering process,the increase of sintering temperature has a negative effect on the water flux of the support,and the minimum is 2166.18 L·(m^(2)·h·MPa);the bending strength has a positive influence,and the maximum is 50.03 MPa;micro-crystal forms such as Mn_(2)AlO_(4) and Al_(2)(SiO_(4))O are formed in the sintering process,which can effectively improve the mechanical properties of the support.2)When the sintering temperature is 1050℃and the temperature holding time is 3 h,the macroscopic shape of the support is relatively flat,and the neck connection is formed between grains,and the water flux,flexural strength and acid-base corrosion rate are maintained at a high level.