Ceramic tubes are typically fabricated using materials such as alumina ceramics and silicon carbide ceramics. Alumina ceramics are characterized by high wear resistance, high hardness, resistance to oxidation and corrosion, and exceptional strength across a wide range of temperatures-from extreme heat to extreme cold. Silicon carbide ceramic pipes, conversely, offer excellent wear resistance, resistance to erosion, and a certain degree of thermal shock resistance.
Various methods are employed for forming ceramic tube products, including dry pressing, slip casting, extrusion, cold isostatic pressing, injection molding, tape casting, hot pressing, and hot isostatic pressing. In recent years, both domestic and international researchers have developed additional forming techniques, such as filter pressing, direct coagulation casting, gel casting, centrifugal slip casting, and solid freeform fabrication. The specific forming method chosen depends on the product's shape, dimensions, geometric complexity, and required precision. Zirconia ceramic tubes are typically fired at temperatures ranging from 800°C to 1000°C, whereas alumina ceramic tubes are produced by firing kaolin at temperatures between 1600°C and 2000°C. The production cycle for ceramic tubes is relatively long, and the degree of mechanization and automation within the manufacturing process remains comparatively low. Furthermore, the production process entails a high consumption of auxiliary materials-such as gypsum molds, saggers, and boron nitride plates-as well as significant energy consumption in the form of coal, natural gas, and electricity; consequently, the manufacturing of ceramic tubes is characterized as a process-based production system with a relatively low degree of operational continuity.