关键词: 陶瓷过滤器 , 扫描电镜, 孔隙率, 包埋剂

Abstract: Impregnating with the embedding medium had been successfully used in the SEM analysis of ceramic filter support body．The porosity ，pore diameter，ceramic grain diameter，ash deposition amount and other microstructure parameters of the support body could be measured and calculated without changing its structure by using this method．The verification results of mercury － injection apparatus and X － ray diffractometer （XRD） show that the calculation results are accurate and reliable．The SEM analysis results show that although the same size grains are used ， the pore diameters in the support body are very different due to the irregular shape and the random packing of the ceramic grains．Then， the local velocity and ash concentration distribute non － uniformly in the support body while the ceramic filter is used，which should result in the ash accumulating in the body and the resistance increasing．With the pulse cleaning cycle increasing，ash deposition in the filter support body has shown an aggravation tendency and extends towards its inside．

Key words: Ceramic filter , SEM , Porosity , Embedding medium