Wear on industrial elbows has always been a factor affecting safe and civilized production. With the continuous development of science and technology, materials have also evolved, leading to the emergence of cast stone, cast steel, alloys, centrifugal casting composite ceramics, and other materials. Among them, the alumina ceramic lining for pipes, known for its high wear resistance, hardness, oxidation and corrosion resistance, as well as excellent high and low temperature strength performance, has become a widely used abrasive material, accounting for about 80% of the world's special ceramics market share (abrasive materials).
Widely distributed across industries with severe wear, such as thermal power, steel, smelting, cement, machinery, coal, mining, chemicals, and ports.
Wear-resistant elbow joints are made by bonding special alumina wear-resistant ceramic tiles to the internal surface of steel pipe elbows using high-temperature, strong adhesive. This solution addresses the severe wear issue in the conveying elbow sections of industries such as power generation, metallurgy, steel, and cement. The combination of steel pipe elbows and ceramic tile bonding allows for easy replacement and construction. Depending on working conditions, different production processes can be adopted, including direct bonding, bolted clamping, or integrated molding. The integrated molding method for medium pipes (RHS) involves using selected alumina particles, which are sintered into lining pipes through various shaping techniques. These pipes are then cast within the steel pipe using a special filling material. This method's formed pipes differ from ceramic composite pipes made with self-igniting technology, as their lining ceramic crystals are identical to those of bonded tiles. The advantages include a smooth inner pipe wall and excellent wear resistance, making them suitable for high-quality material conveying and ash removal systems.
The ceramic assembly method using bolt clamping involves triple fixation: adhesive bonding, ceramic interlocking, and bolt clamping. Due to the triple fixation method, the ceramic and the equipment are integrated as one, ensuring that the ceramic will not fall off even at temperatures above 1000℃. In recent years, with the accelerated development of China's power construction and the continuous promotion of new technologies and materials, the wear-resistant elbow has been applied to dozens of new power plant projects across the country, demonstrating excellent performance and receiving extensive promotion.
Centrifugal casting composite pipes are manufactured using the "self-propagating high-temperature synthesis-hyper-speed centrifugal technology," forming a uniform, dense, and smooth ceramic layer and transition layer under high temperature and high-speed conditions. Additionally, the ceramic at working temperatures of 850-900 degrees Celsius will not fall off, and they are relatively lightweight. The composite ceramic resists wear with its hardness, solving the past issue of relying on thickness for wear resistance. Currently, they are very effective in industries with severe wear, such as straight pipes, elbows, bends, tees, and more.
Composite pipes fully utilize the high strength, good toughness, impact resistance, excellent welding properties of steel pipes, as well as the high hardness, excellent wear resistance, corrosion resistance, and heat resistance of alumina ceramic, overcoming the shortcomings of steel pipes such as low hardness, poor wear resistance, and poor toughness of ceramics. Therefore, composite pipes have excellent comprehensive properties including good wear resistance, heat resistance, corrosion resistance, and resistance to mechanical and thermal shock, along with good weldability. They are suitable for wear-resistant and corrosion-resistant pipelines for conveying granular materials, abrasive materials, corrosive media, etc.
