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28-
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The numerous ceramic honeycomb composed of equal holes of various shapes, the maximum number of holes has reached 20 to 40 per square centimeter, the density of 4 to 6 grams per cubic centimeter, the water absorption of up to 20% or more. Due to the characteristics of the porous thin-walled, greatly increasing the geometric surface area of the carrier and the improved thermal shock resistance, current products, the mesh hole triangle and the Quartet, triangle endurance much better than the Quartet, number of holes. more, which is particularly important as a catalyst carrier. With the increased unit area Number of holes and Vectors hole wall thickness reduction of the thermal shock resistance of the ceramic carrier trend is to improve the thermal shock damage temperature is raised. Therefore, the ceramic honeycomb must reduce the coefficient of expansion and increase the number of holes per unit area. Coefficient of thermal expansion is the main performance indicators, the current level of foreign α25-1000 ° C ≤ 1.0 × 10 -6 ° C -1, compared with a certain gap with the country, but this gap is getting smaller and smaller. The first production of the raw materials of ceramic honeycomb kaolin, talc, aluminum powder, clay, and today has broken, especially the application of diatomaceous earth, zeolite, expansive soil, as well as refractory, ceramic honeycomb is used widely, increasing performance good.
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