Toughened high-alumina ceramic wear-resistant composite pipe

Ceramic wear-resistant elbows are generally divided into two types: one is the self-igniting ceramic elbow produced using high-temperature self-igniting centrifugal composite technology, and the other is the ceramic tile wear-resistant elbow. I. Self-igniting ceramic composite pipes are likely to be quite common. Such pipes consist of three layers from the inside out: corundum ceramic, a transition layer, and steel. The ceramic layer inside can form dense corundum at temperatures above 2,200 degrees Celsius, and it can also form a strong bond with the steel pipe through the transition layer ； There are many small-diameter types, which are widely used in pneumatic ash transport, dust removal, wear-resistant elbows, and wear-resistant pipes in power plants. Ash transfer wear-resistant ceramic elbows, dust removal wear-resistant elbows. II. As one type of ceramic composite pipe, the ceramic-pasted composite pipe not only takes full advantage of the steel pipe’s strengths such as high strength, good toughness, impact resistance, and excellent weldability, but also benefits from the advantages of corundum ceramics, including high hardness, high wear resistance, corrosion resistance, and heat resistance. It can even overcome the shortcomings of steel pipes, such as low hardness, poor toughness, and weak wear resistance ； With a hardness of over 85, the thickness of the corundum ceramic can be selected according to actual conditions, ensuring ease of use. It is widely used in coal powder conveyance pipelines in power plants, wear-resistant pipelines in coal washing plants, and dust removal wear-resistant pipelines in cement plants and steel mills.

Technical requirements for ceramic elbows in ash transfer wear-resistant pipelines: Ceramic elbows used in ash transfer pipelines in power plants are employed frequently. Coal used in power plants, both domestically and internationally, contains a high amount of impurities including stones, and its quality is poor; as a result, wear-resistant elbows used for ash transfer in power plants suffer from severe wear and have a short lifespan. The use of ceramic wear-resistant pipes yields significant results. 1. The ceramic composite pipe used for ash transport features a interlocking ceramic patch structure to prevent detachment; it is employed in ash transport systems, with the steel pipe thickness being no less than 5 mm and the ceramic layer thickness being less than 8 mm. 2. To reduce the resistance to fluid flow within the pipe, the ceramic outer tube of each elbow should adopt an integral or heat-bent elbow design; shrimp-shaped elbows or assembled elbows cannot be used for individual elbows. 3. To reduce the incidence of leaks, the length of each fitting in a straight pipe should be no less than 6 meters. The ceramic outer tube must be manufactured from a single seamless steel tube; straight pipes cannot be made by joining multiple sections together. 4. The inner diameter of all pipes must be consistent; the ceramic lining blocks should fit together tightly without any gaps, and their surfaces must be smooth. Adhesives or other substances shall not be used for filling purposes. After the ceramic pipes are formed, any debris inside them must be removed, and the lining should appear in a pure ceramic white color. 5. Adhesive: A high-temperature and low-temperature resistant inorganic adhesive is used as the bonding agent between the ceramic tiles and the cylinder body; its thickness should be ≥1 mm. The adhesive must have stable properties and strong impact resistance, enabling it to function over a long period of time in temperatures ranging from -30°C to +600°C, with complete filling of the gaps.