What is honeycomb ceramic filler? What are the functions of honeycomb ceramic?


Release time:

2020-10-23

Honeycomb ceramic filler is a porous industrial ceramic. Its internal shape is a number of parallel honeycomb-shaped channels. These honeycomb units are divided by thin lattice-like partition walls. Compared with general block ceramics, honeycomb ceramic fillers have the characteristics of large specific surface area, low pressure drop, low resistance, high temperature resistance, good chemical stability, low thermal expansion, good thermal insulation, light weight, high strength, etc., so they are particularly suitable for Catalyst carriers for various purposes. In addition, since the fluid can pass through the cavities on the upper and lower surfaces of the honeycomb ceramic partitions, the honeycomb ceramic partitions can be used for heat exchange and chemical reactions. At present, honeycomb ceramics are widely used in kiln regenerators, automobile exhaust purifiers, ozone suppression catalyst carriers, heat exchange and filtration of molten metal in the metallurgical industry, chemical reaction carriers and catalysts in the chemical industry, and toxic gases and liquids in the mining industry. Purification treatment, spraying in light industry, sound-absorbing materials in building materials industry and heat insulation materials in kilns.

Honeycomb ceramic filler is a porous industrial ceramic. Its internal shape is a number of parallel honeycomb-shaped channels. These honeycomb units are divided by thin lattice-like partition walls. Compared with general block ceramics, honeycomb ceramic fillers have the characteristics of large specific surface area, low pressure drop, low resistance, high temperature resistance, good chemical stability, low thermal expansion, good thermal insulation, light weight, high strength, etc., so they are particularly suitable for Catalyst carriers for various purposes. In addition, since the fluid can pass through the cavities on the upper and lower surfaces of the honeycomb ceramic partitions, the honeycomb ceramic partitions can be used for heat exchange and chemical reactions. At present, honeycomb ceramics are widely used in kiln regenerators, automobile exhaust purifiers, ozone suppression catalyst carriers, heat exchange and filtration of molten metal in the metallurgical industry, chemical reaction carriers and catalysts in the chemical industry, and toxic gases and liquids in the mining industry. Purification treatment, spraying in light industry, sound-absorbing materials in building materials industry and heat insulation materials in kilns.

 

 

Honeycomb ceramics can be made from a variety of materials. The main materials are: cordierite, mullite, aluminum titanate, silicon carbide, zirconia, silicon nitride, cordierite-mullite, cordierite-aluminum titanate and other composite matrices. Since the American Corning Company produced the first honeycomb ceramic carrier using extrusion in 1973, the current annual sales volume of honeycomb ceramics worldwide has exceeded 100,000,000 pieces, and honeycomb ceramics have become one of the most important ceramic products in the world. Honeycomb ceramics are composed of numerous equal holes in various shapes. At present, the maximum number of holes has reached 120 to 140 per square centimeter, the density is 0.3 to 0.6 grams per cubic centimeter, and the water absorption rate is as high as 20% or more. Due to the characteristics of porous thin walls, the geometric surface area of ​​the carrier is greatly increased and the thermal shock resistance is improved. The mesh holes of the products produced are mainly triangular and square. Triangle has a much better endurance than square and has more holes. These are particularly important as catalytic carriers. As the number of holes per unit area increases and the thickness of the carrier hole wall decreases, the thermal shock resistance of the ceramic carrier increases, and the temperature of thermal shock damage also increases. Therefore, honeycomb ceramics must reduce the expansion coefficient and increase the number of holes per unit area. The thermal expansion coefficient is the main performance indicator. The current foreign level is α25-800℃≤1.0×10-6℃-1. There is a certain gap compared with the domestic one, but the gap is getting smaller and smaller. The raw materials for the earliest production of honeycomb ceramics were mainly kaolin, talc, aluminum powder, clay, etc. Today, breakthroughs have been made, especially the application of diatomite, zeolite, expanded earth and refractory materials. Honeycomb ceramics are increasingly widely used and their performance is getting better and better. good.

 

In addition to the basic properties of high temperature resistance, corrosion resistance, and high mechanical strength commonly possessed by ceramic products, honeycomb ceramics also have two most important properties, which are also the basis for honeycomb ceramics: 1. Large specific surface area. Compared with traditional spherical and ring-shaped ceramic products, the specific surface area of ​​honeycomb ceramics is much larger. Other ceramic products can only increase the specific surface area by adding patterns, drilling and other processes, while honeycomb ceramics can easily achieve a large specific surface area due to its special shape. Thus, when acting as a catalytic reaction carrier and heat storage body, the mass transfer and heat transfer efficiency is greatly improved. 2. Small resistance. The pores of honeycomb ceramics are straight through, large and regular. When gas or liquid passes through, it encounters very little resistance. Therefore, when used as a kiln regenerator, the air circulation speed is increased, and heat is accumulated and released in a shorter time; when used as a reaction tower filler, the power consumption of the air compressor can be reduced; when used as a car exhaust purifier, it can reduce Loss of engine power. To give full play to the large specific surface area of ​​honeycomb ceramics, the most effective method is to increase the number of holes per unit area of ​​honeycomb ceramics. From the 100 mesh/inch2 at the beginning of the advent of honeycomb ceramics to the 600 mesh/inch2 currently widely used, the Japanese HONDA company has developed a 1200 mesh/inch2 product (its wall thickness is thinner than a human hair), but in our country At present, it can only achieve 600 mesh/inch2. At present, the honeycomb ceramic products of three companies, Corning Corporation of the United States, NGK Corporation of Japan, and Denso Corporation of Japan, occupy more than 90% of the world market.


 

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