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, aluminum oxide ceramic liners for pipes, known for their high wear resistance, hardness, oxidation and corrosion resistance, and excellent high and low temperature strength performance, have become a widely used wear-resistant material, accounting for about 80% of the world's special ceramic market share (wear-resistant materials).
Widely distributed across industries with severe wear, such as thermal power, steel, smelting, cement, machinery, coal, mining, chemicals, and port terminals.
Wear-resistant elbow joints are made by bonding special alumina abrasion-resistant ceramic tiles to the internal surface of steel pipe elbows with a high-temperature, strong adhesive. This solution addresses the severe wear issue in the conveying elbow sections of industries such as thermal power, metallurgy, steel, and cement. It also employs a combined approach of using steel pipe elbows and ceramic tiles for easy replacement and construction. Depending on the working conditions, different production processes can be used, including direct bonding, bolted mounting, or integrated molding. The integrated molding method for medium pipes (RHS) involves using selected alumina particles, which are sintered into lining pipes through various molding techniques. These pipes are then cast within the steel pipe using a special filling material. This method's molded pipes differ from ceramic composite pipes formed by self-ignition technology, as their lining ceramic crystals are identical to those of bonded tiles. The advantages include a smooth inner 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 through adhesive bonding, ceramic sheet interlocking, and bolt clamping. Due to the triple fixation, the ceramic and equipment are integrated as one, ensuring that the ceramic will not fall off even at temperatures above 1000°C. In recent years, with the accelerated development of China's power construction and the continuous promotion of new technologies and materials, wear-resistant elbows have been applied to dozens of new power plant projects across the country, demonstrating excellent performance and receiving widespread promotion.
Centrifugal casting composite pipes are manufactured using the "self-igniting 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. Moreover, the ceramic at working temperatures of 850 to 900 degrees Celsius does 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 highly effective in industries with severe wear, such as straight pipes, elbows, bends, tees, and more.
Composite pipes, by fully utilizing the high strength, good toughness, impact resistance, and excellent welding properties of steel pipes, as well as the high hardness, high wear resistance, corrosion resistance, and good heat resistance of alumina ceramics, overcome the disadvantages of steel pipes, such as low hardness and poor wear resistance, and the poor toughness of ceramics. Therefore, composite pipes have excellent comprehensive properties including good wear resistance, heat resistance, corrosion resistance, resistance to mechanical and thermal shock, and good weldability. They are suitable for conveying abrasive materials, grinding, corrosive media, and other wear-resistant and corrosion-resistant pipelines.
