Wear-resistant ceramic fly ash transportation pipelines are substantially different from traditional steel pipes, wear-resistant alloy cast steel pipes, cast stone pipes, steel-plastic, steel rubber pipes, etc. It is not only wear-resistant, corrosion-resistant, and high-temperature resistant, and has high hardness and strength, but also has good comprehensive properties of resistance to mechanical impact and thermal shock.
The outer layer of the fly ash wear-resistant pipe is a seamless steel pipe, and the inner layer is corundum special ceramics. The hardness of the corundum ceramic layer is as high as HV1100-1400, which is equivalent to tungsten-cobalt carbide, and its wear resistance is more than 20 times higher than that of carbon steel pipes.
The design of the pipeline combines the strength of seamless steel pipes with the wear resistance of corundum special ceramics, ensuring long-term stable operation when handling abrasive materials such as fly ash. In particular, the high hardness of the corundum ceramic layer gives it excellent wear resistance, far exceeding that of traditional carbon steel pipes.
The advantage of this kind of pipe is that its wear resistance mainly relies on the inner corundum ceramic layer, rather than solely relying on the composition or structure of the material. This means that this type of pipe is more efficient in resisting wear and has a longer service life than traditional wear-resistant alloy cast steel pipes or cast stone pipes. This qualitative leap undoubtedly provides new solutions for wear-resistant pipes in industrial applications.
In practical applications, this kind of fly ash wear-resistant pipe may be used to handle fly ash in various environments, such as fly ash conveying systems in power plants. Its excellent wear resistance and durability enable it to operate continuously and stably in these environments, greatly improving the operating efficiency and service life of the equipment.
The melting point of corundum ceramics in fly ash wear-resistant pipes is 2045°C. The corundum ceramic layer and steel layer have special structures due to process reasons, and the stress field is also special. At normal temperature, the ceramic layer is subjected to compressive stress, and the steel layer is subjected to tensile stress. As long as the temperature rises above 400°C, due to the different thermal contraction coefficients of the two, the new stress field generated by the thermal contraction will offset the original stress field in the fly ash wear-resistant pipe, causing both the ceramic layer and the steel layer to in a state of stress equilibrium. When the temperature rises to 900°C, put the fly ash wear-resistant pipe into cold water and repeat it many times. The ceramic layer will not crack or collapse, showing the unparalleled thermal shock resistance of ordinary ceramics. This performance is very important in engineering construction. CUHK has a purpose.
Since the outer layer is made of steel, and the inner layer does not crack when heated, during construction, flanges, purge ports, explosion-proof doors, etc. can be welded, and direct welding can also be used to connect pipes, which is better than wear-resistant alloy cast steel pipes. , cast stone pipes and steel-plastic, steel rubber pipes are not easy to weld or cannot be welded during construction. Fly ash wear-resistant pipes also have good mechanical impact resistance. The corundum layer will not break and fall off during transportation, installation, knocking, and self-weight bending deformation between the two supports.
The inner layer of fly ash wear-resistant pipes is dense alpha-type aluminum oxide, with an acid resistance of 96-98%. Aluminum trioxide is a neutral oxide and does not react chemically with acids, alkalis, and salts. Aluminum trioxide is an inorganic substance. There is no problem of performance deterioration (i.e. aging) under the long-term effects of light, heat, oxygen, and other natural environments. It has been determined that the corrosion resistance of fly ash wear-resistant pipes is ten times higher than that of stainless steel.
