Patent ID: 8114184

Claim:
A honeycomb ceramic particulates filtration substrate formed by extruding and sintering a paste, the paste comprising: a unit weight portion of silicon carbides (SiC); a weight portion ranging from about 0.05 to about 0.5 of clay; a weight portion ranging from about 0.1 to about 0.35 of flour; a weight portion ranging from about 0.025 to about 0.05 of grease; and a weight portion ranging from about 0.2 to about 0.35 of water, wherein the sintered substrate formed by extruding and sintering the paste has: a honeycomb structure with a cell density ranging from about 4 to about 62 cells/cm 2 , a cell wall thickness ranging from about 0.2 to about 1.2 mm, a cell wall porosity ranging from about 40% to about 70%, a cell wall through pore rate of more than 30%, and an average diameter distribution of cell wall micro-pores ranging from about 1 to about 50 μm, and wherein the silicon carbides are selected from two grain sizes such that each of the silicon carbides of a first one of the two grain sizes differs in size from each of the silicon carbides of a second one of the two grain sizes by an amount ranging from about 200 to about 400 meshes, and a ratio of difference in weight between the two grain sizes of silicon carbides ranges from about 1:4 to about 3:4.