We are China Chemical Fillers Supplier, let me tell you some knowledge of Honeycomb Ceramic.
Honeycomb Ceramics are composed of various shapes of numerous equal pores. At present, the largest number of pores has reached 20-40 per square centimeter, and the density is 4-6 grams per cubic centimeter, and the water absorption rate is up to 20% or more. Due to the characteristics of the porous thin wall, the geometric surface area of the carrier is greatly increased and the thermal shock resistance is improved. At present, the meshed holes of the product are mainly triangular and tetragonal, and the triangle is much more bearable than the tetragonal, and the number of holes is also large. More, this is especially important as a catalytic carrier. With the increase of the number of holes per unit area and the reduction of the wall thickness of the carrier, the thermal shock resistance of the ceramic carrier is improved, and the temperature of thermal shock damage is also increased.
Therefore, honeycomb ceramics must reduce the coefficient of expansion and increase the number of holes per unit area. The coefficient of thermal expansion is the main characteristic index, and the current foreign level is α25-1000°C≤1.0×10-6°C-1, which is a certain gap with domestic comparison, but the gap is getting smaller and smaller. The earliest raw materials for the production of honeycomb ceramics were kaolin, talc, aluminum powder, and clay. Today, they have broken through, especially the use of diatomaceous earth, zeolites, expansive clay, and refractory materials. Honeycomb ceramics are used more and more widely and have more and more features.