| 摘要 |
PROBLEM TO BE SOLVED: To produce a cordierite honeycomb structure having such characteristics as a high rate of capture, a small pressure drop and a low coefft. of thermal expansion. SOLUTION: This honeycomb structure is based on cordierite having a chemical structure consisting of 45-55wt.% SiO2 , 33-42wt.% Al2 O3 , and 12-18wt.% MgO and has <=0.3×10<-6> / deg.C coefft. of thermal expansion in the range of 25-800 deg.C, 55-80% porosity and 25-40μm average pore diameter. The pores in the surfaces of the partition walls are fine pores of 5-40μm and coarse pores of 40-100μm and the number of the fine pores is 5-40 times that of the coarse pores. |
