Honeycomb ceramics is one kind of industrial porous ceramics, many passable parallel channels are ramified over its inside. Each individual part made up of these honeycomb ceramics are constructed into the shape with square cells at two ends. Of which the materials are cordierite(2MgO·2Al2O3·5SiO2), aluminum titanate(Al2TiO5), mullite(3Al2O3·2SiO2), alumina(Al2O3) and some other compound materials. Compared with ordinary ceramic materials, they are characterized by low heat expansion ratio, high[...]