Abstract: Ceramic filters have a great potential for applications in high temperature dust collection due to their high erosion resistance and mechanical strength at elevated temperatures. In this work, a filtering tube of cordierite ceramic composite with pore-gradient structure was fabricated and studied, which is made up of a porous cordierite ceramic support, a transition layer and a separation layer of fiber-reinforced composite, having a porosity of 35;-40;, 50;-60; and 60;-70;, respectively. The thermal shock resistance test against the temperature difference of ca. 1000℃ and room temperature simulation on dust gas filtration were mainly carried out. The results show that the total filtration efficiency of the dust particulates larger than 0. 1μm is 98.5; and maximum value reaches to 99.9;.

Key words: Ceramic filters have a great potential for applications in high temperature dust collection due to their high erosion resistance and mechanical strength at elevated temperatures. In this work, a filtering tube of cordierite ceramic composite with pore-gradient structure was fabricated and studied, which is made up of a porous cordierite ceramic support, a transition layer and a separation layer of fiber-reinforced composite, having a porosity of 35;-40;, 50;-60; and 60;-70;, respectively. The thermal shock resistance test against the temperature difference of ca. 1000℃ and room temperature simulation on dust gas filtration were mainly carried out. The results show that the total filtration efficiency of the dust particulates larger than 0. 1μm is 98.5; and maximum value reaches to 99.9;.