Development background of thermal spraying technology application

       In 1913, Schoop proposed the design of the arc spray gun, and developed a practical arc spray gun in 1916 to prepare long-term anti-corrosion coatings for steel structures, and the thermal spray technology was really used in production practice. Wire flame spraying and arc spraying were developed in the 1930s as the main thermal spraying methods. After the establishment of Metco Metal Spraying Company in the United States, it has successively developed E-type spray guns with air turbine wire feeding and K-type spray guns with electric motor wire feeding. Zinc-spraying and aluminum-spraying long-lasting protective coatings for steel structures. Britain successfully developed the Schoet powder flame spray gun, and then Metco developed the Metco-P powder flame spray gun. Since then, various professional spraying companies around the world have also researched and developed a series of powder flame spraying guns accordingly, and have carried out a lot of research and application promotion of thermal spraying technology, which has made thermal spraying technology have made great progress and achieved great achievements.



    's results. Since the 1920s and 1930s, thermal spraying technology has been widely used for long-term protection of steel products such as ships, steel structures, and water gates. The United States, Britain, Germany, France, Japan and other industrialized countries have formulated corresponding technical standards for thermal spraying. Recommendations for the selection of protective coating life indicators. The United States, Britain, Germany and other countries have vigorously promoted this technology for 10 to 20 years since the 1950s.



    (2) The second stage of thermal spraying technology With the development of spraying technology, new coating materials continue to appear. In the early 1950s, self-fluxing alloy powder materials were developed, followed by the emergence of powder flame spray welding technology. The successful research on self-fluxing alloy powder materials has played a powerful role in promoting the application of thermal spraying technology in the industrial field. The thermal spraying technology has been developed from the original surface protection and repair to the surface strengthening of mechanical parts. It is not only used for the repair of waste parts, but also for the preparation of pre-protection and strengthening coatings for new parts, creating the application of thermal spraying technology. new field.



    In the late 1950s, the United Carbide Corporation of the United States successfully developed the gas repeated explosive spraying technology, which was used to prepare high-quality carbide coatings and oxide ceramic coatings, and was first applied to the aviation industry.



    The high particle velocity of gas explosion spraying can produce very good carbide cermet coatings, but the temperature is low, and there are still unsatisfactory places for the preparation of oxide ceramic coatings. With the development of the aviation industry, the performance requirements of aero-engines are getting higher and higher. The engine parts must not only have high-temperature strength, but also have high-temperature thermal insulation properties, so as to achieve the purpose of effectively utilizing the thermal efficiency of the engine. Ceramic thermal barrier coating is one of the key technologies to improve the thermal efficiency of aero-engines. The basic principle is that ceramics have a high melting point and low thermal conductivity, and the ceramic coating contains a certain porosity, which can isolate the high-temperature components of the engine and gas turbine from the high-temperature gas, so the ceramic coating becomes a good high-temperature barrier. Thermal coating material. In order to solve the application of ceramic coating, American Plasmadyne Co., Ltd.