Silicon carbide, quartz, corundum and other composite ceramic risers are mainly used in low-pressure casting industry, and also suitable for ceramic degasser, thermocouple protection sleeve and so on. The composite ceramic riser tube has good properties such as corrosion resistance, low thermal expansion coefficient and good thermal shock resistance, no slag, no cracking, high temperature thermal erosion, long service life and so on. Its excellent oxidation resistance, high thermal shock stability and non-wetting with high-temperature metal melt make it an ideal material for metallurgical low-pressure casting industry. The use of composite ceramic riser tube can improve the quality of castings and significantly reduce the operating cost of low pressure casting. Its service life is 5-20 times that of the traditional riser, which greatly reduces the number of replacements of the riser and fully ensures the continuity and automation of production. The special ceramic risers with different composite materials are suitable for cast steel, cast aluminum, non-ferrous metal smelting and other industries.