以粉煤灰为原料,采用挤压成型和固态粒子烧结法制备管状粉煤灰基多孔陶瓷膜支撑体.采用TG-DSC技术对粉煤灰进行了热分析,采用SEM和XRD技术对样品的微观结构及物相组成进行了分析,并测定了样品的开孔率、抗压强度及空气渗透速率等性能指标.研究了烧结温度、保温时间和造孔剂添加量对支撑体性能的影响.结果表明:支撑体晶相组成主要为赤铁矿、红柱石和石英;烧结温度为1000 ℃,保温2 h,仅添加1%的粘结剂,不添加造孔剂的条件下制备出的管状支撑体综合性能最优,此时的支撑体孔隙率为44.95%,抗压强度为8.92 MPa,空气渗透速率为2.57×104 m3·h-1·m-2·MPa-1.
Tubular porous ceramic membrane supports were prepared by extrusion molding and solid particle sintering method using fly ash as raw material.The thermal analysis of fly ash was determined by TG-DSC.The microstructure and phase composition of samples were analyzed by SEM and XRD.The property indexes such as the open porosity, compressive strength and air permeability were also measured.The influences of sintering temperature, holding time and pore former content on the performances of the supports were investigated.Results indicate that the phase of supports is mainly composed of hematite, andalusite and quartz.The excellent comprehensive performance tubular supports with open porosity of 44.95%, compressive strength of 8.92 MPa, and the air permeability of 2.57×104 m3·h-1·m-2·MPa-1 can be fabricated under the optimized conditions: sintering temperature being 1000 ℃, holding time of 2 h, binder of 1% and without adding pore former.
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