Hard surface technology (thermal spraying, surfacing, spray welding, etc.) and hard surface materials (tungsten based, chromium based, ceramics, etc.) have been widely used in industries such as steel, aviation, aerospace, automotive, general machinery, energy, petrochemicals, textiles, and papermaking. Thermal spraying technology is one of the rapidly developing surface technologies in recent years, which has been widely used in anti-corrosion, wear-resistant, thermal insulation, functional coatings, and remanufacturing, making great contributions to the development of the national economy. At the same time, it has its unique role in energy conservation, emission reduction, and environmental protection (such as replacing electroplated hard chromium and repairing and remanufacturing workpieces).
1 Aviation
Thermal spraying technology is widely used in the aviation field, such as spraying thermal barrier coatings (bonding layer+ceramic surface) on aircraft engine blades. Using plasma spraying and supersonic flame spraying for bonding layers, such as NiCoCrAlY, CoNiCrAlY, and ceramic surface layer, with a mass fraction of 8% Y ₂ O3-ZrO2
(YSZ)、 Oxide (including rare earth oxide) doped YSZ modification, such as TiOz+YSZ, YSZ+Al2O3, or rare earth zirconate lanthanum based oxide, such as La2 (ZraCe032O7P4). There are also related research questions on the application of thermal barrier coatings in rocket engine combustion chambers. The main rotor shaft of helicopters conducting military operations in desert areas is susceptible to sand erosion. The use of HVOF and explosive spraying WC12Co can improve its wear resistance. HVOF spraying Al SiC coating on magnesium alloy substrate for aviation can improve wear resistance.
2 Steel and Petroleum Industries
The steel industry is an important field for thermal spraying applications. The use of thermal spray coating on components such as blast furnace tuyere, high-temperature annealing furnace rollers, hot roll plate conveying rollers, support rollers, straightening rollers, galvanized lifting rollers, sinking rollers, etc. can greatly improve work efficiency, reduce costs, improve product quality, and achieve significant benefits.
Conclusion: The development of high-end technology cannot be separated from the application of thermal spraying technology, such as aviation engines, large aircraft, high-end automotive steel plates, precision ball valves, solid oxide fuel cells, marine exploration (such as oil extraction), industrial gas turbines, etc. The rapid development of thermal spraying application technology cannot be separated from the support of high-end thermal spraying materials. Tungsten carbide based spray powder is the most widely used wear-resistant and corrosion-resistant material in thermal spraying technology applications.