The ceramic cylinder liner produced by our company was listed in the national key "Double High and One Excellent" project in 2003. The product is mainly used in oil drilling and geological exploration, especially suitable for oil production with deep oil reservoirs, poor surface structure and soil quality. Environment and offshore oil and natural gas development, etc. Compared with metal products, the service life is increased by 5 to 10 times, and the cost of oil production is reduced by more than 50%. Ceramic cylinder liners developed using phase change toughening technology have the advantages of wear resistance, corrosion resistance, high pressure resistance, high temperature resistance, high strength, and high hardness. The technical level of this project has filled the domestic gap and is at the leading domestic level