Thermal spraying technology has been widely applied in the country. The trend and characteristics of the development in recent years are:
(1) Large-area long-term protection technology has been widely used for long-term exposure to the atmosphere of steel structure, using aluminum, zinc and its alloy coating, instead of the traditional brush painting method, the implementation of cathodic protection for long-term atmospheric corrosion In recent years, it has developed rapidly. Such large-scale projects as television towers, bridges, highway facilities, sluice gates, microwave towers, high-voltage power transmission towers, underground cable supports, navigation mark floating drums, and shaft wells have been treated with aluminum, zinc and their alloys for corrosion protection. At present, there are dozens of professional spraying plants in the country engaged in this work, spraying an area of ​​several million square meters per year. This technology has not only been widely used and promoted in China, but also has been widely applied in foreign aid projects.
(2) The use of thermal spraying technology to repair and intensify the manufacture of large-scale key equipment and imported parts. There have been many successful applications in this area in recent years, such as: one-meter-seven rolling mills, high-speed fan rotors, large extruder plungers, and large gears , electrode extrusion nozzle, high-power automotive crankshaft and so on. One of these tasks is to solve the urgent need for production; the second is to save a lot of foreign exchange.
(3) Application of supersonic flame spraying technology With the development and improvement of thermal spray technology in our country, the quality requirements of the spray coating are also increasing. The high-speed gas (HVOF) method developed in the United States and other countries in recent years is a new process method for preparing high-quality coatings. Since the supersonic flame spraying method has many advantages, at present, China has introduced nearly a dozen of equipments from abroad and has played an important role in various industrial sectors.
(4) The gas explosion-type spray coating technology has further been applied to this spraying technology. Because the particle flight speed can reach 800m/s or more, the bond strength between the coating and the substrate can reach more than 100MPa, and the porosity is less than 1%. It is applied in some fields. Better than other spraying methods. At present, more than 10 units have been installed in China.
(5) The development of oxyacetylene flame plastic powder coating technology has been rapidly developed. As mentioned above, in recent years, there have been many domestic production of oxyacetylene flame plastic powder coating equipment. With this technology, it has been used in chemical storage tanks, pipelines, and ceramics industries. The muddy board frame, the guide roller of the printing and dyeing industry, the cast iron carrier of the belt conveyor in the coal industry, the equipment for the injection of oil in the petroleum industry, and the surface decoration have all been well applied, and have made up for the lack of electric spray. For the application of plastic coatings, opened up a new way.
(6) Application of thermal spray technology in chemical anticorrosion projects Corrosion is one of the main reasons for the mechanical components being deactivated by the chemical or electrochemical action of surrounding media. It not only results in the loss of a large amount of metal materials, and thus the production loss caused by it is more difficult to estimate. Therefore, people attach great importance to chemical anti-corrosion work. The thermal spray layer is used in corrosive media, especially strong media corrosion, and it has not been possible to break through before. The main reason is that the sealing agent has not been solved. It is known that there are pores in the sprayed layer. If the pores are not sealed, various acids, alkalis, and organic media will be immersed in the pores to cause the coating to fall off and affect the anti-corrosion effect. According to the requirements of anti-corrosion projects, recently China has successfully developed dozens of models of sealing agents such as polyester, organic polymer, resin, plastic, and adhesive, which are suitable for the corrosion of acids, alkalis, salts, and organic substances. The environment, the use of temperature 80 ~ 350 °C. Using ceramic coating, oxide coating or metal or alloy coating, according to different media, choose the appropriate sealing agent, has been applied in many chemical corrosion media, the effect is good. The series of sealing agent has been patented and won the national invention award. The successful research of these sealing agents has made new progress in the application of thermal spraying technology in chemical anticorrosion projects.
(7) Application of laser remelting technology In recent years, high-frequency induction remelting and vacuum induction remelting have only been applied within a certain range. Laser remelting technology has been used in small area tests in previous years and has not been widely used. Tsinghua University has recently applied laser remelting technology to valve production. Shanghai No. 2 Textile Machinery Factory has applied laser remelting technology to textile machinery.
(8) Thermal spraying technology has also been applied to medical and sanitary aspects of building and decoration. In recent years, various statues, accessories, and large-scale walls have been sprayed with thermal spraying technology in Sichuan, Shanghai, Shenyang, and Yunnan, and have received good results, such as Shenyang City. The international shopping mall's peacock opens with large-scale murals using thermal spraying technology. With the development and improvement of thermal spraying technology, this technology has penetrated into other fields, such as the thermal spraying method in the biological field, and the manufacture of artificial bones. At present, there are more than 200 clinical cases in China and the results are very good. In addition, artificial teeth made using the thermal spray method have also been initially applied.
(1) Large-area long-term protection technology has been widely used for long-term exposure to the atmosphere of steel structure, using aluminum, zinc and its alloy coating, instead of the traditional brush painting method, the implementation of cathodic protection for long-term atmospheric corrosion In recent years, it has developed rapidly. Such large-scale projects as television towers, bridges, highway facilities, sluice gates, microwave towers, high-voltage power transmission towers, underground cable supports, navigation mark floating drums, and shaft wells have been treated with aluminum, zinc and their alloys for corrosion protection. At present, there are dozens of professional spraying plants in the country engaged in this work, spraying an area of ​​several million square meters per year. This technology has not only been widely used and promoted in China, but also has been widely applied in foreign aid projects.
(2) The use of thermal spraying technology to repair and intensify the manufacture of large-scale key equipment and imported parts. There have been many successful applications in this area in recent years, such as: one-meter-seven rolling mills, high-speed fan rotors, large extruder plungers, and large gears , electrode extrusion nozzle, high-power automotive crankshaft and so on. One of these tasks is to solve the urgent need for production; the second is to save a lot of foreign exchange.
(3) Application of supersonic flame spraying technology With the development and improvement of thermal spray technology in our country, the quality requirements of the spray coating are also increasing. The high-speed gas (HVOF) method developed in the United States and other countries in recent years is a new process method for preparing high-quality coatings. Since the supersonic flame spraying method has many advantages, at present, China has introduced nearly a dozen of equipments from abroad and has played an important role in various industrial sectors.
(4) The gas explosion-type spray coating technology has further been applied to this spraying technology. Because the particle flight speed can reach 800m/s or more, the bond strength between the coating and the substrate can reach more than 100MPa, and the porosity is less than 1%. It is applied in some fields. Better than other spraying methods. At present, more than 10 units have been installed in China.
(5) The development of oxyacetylene flame plastic powder coating technology has been rapidly developed. As mentioned above, in recent years, there have been many domestic production of oxyacetylene flame plastic powder coating equipment. With this technology, it has been used in chemical storage tanks, pipelines, and ceramics industries. The muddy board frame, the guide roller of the printing and dyeing industry, the cast iron carrier of the belt conveyor in the coal industry, the equipment for the injection of oil in the petroleum industry, and the surface decoration have all been well applied, and have made up for the lack of electric spray. For the application of plastic coatings, opened up a new way.
(6) Application of thermal spray technology in chemical anticorrosion projects Corrosion is one of the main reasons for the mechanical components being deactivated by the chemical or electrochemical action of surrounding media. It not only results in the loss of a large amount of metal materials, and thus the production loss caused by it is more difficult to estimate. Therefore, people attach great importance to chemical anti-corrosion work. The thermal spray layer is used in corrosive media, especially strong media corrosion, and it has not been possible to break through before. The main reason is that the sealing agent has not been solved. It is known that there are pores in the sprayed layer. If the pores are not sealed, various acids, alkalis, and organic media will be immersed in the pores to cause the coating to fall off and affect the anti-corrosion effect. According to the requirements of anti-corrosion projects, recently China has successfully developed dozens of models of sealing agents such as polyester, organic polymer, resin, plastic, and adhesive, which are suitable for the corrosion of acids, alkalis, salts, and organic substances. The environment, the use of temperature 80 ~ 350 °C. Using ceramic coating, oxide coating or metal or alloy coating, according to different media, choose the appropriate sealing agent, has been applied in many chemical corrosion media, the effect is good. The series of sealing agent has been patented and won the national invention award. The successful research of these sealing agents has made new progress in the application of thermal spraying technology in chemical anticorrosion projects.
(7) Application of laser remelting technology In recent years, high-frequency induction remelting and vacuum induction remelting have only been applied within a certain range. Laser remelting technology has been used in small area tests in previous years and has not been widely used. Tsinghua University has recently applied laser remelting technology to valve production. Shanghai No. 2 Textile Machinery Factory has applied laser remelting technology to textile machinery.
(8) Thermal spraying technology has also been applied to medical and sanitary aspects of building and decoration. In recent years, various statues, accessories, and large-scale walls have been sprayed with thermal spraying technology in Sichuan, Shanghai, Shenyang, and Yunnan, and have received good results, such as Shenyang City. The international shopping mall's peacock opens with large-scale murals using thermal spraying technology. With the development and improvement of thermal spraying technology, this technology has penetrated into other fields, such as the thermal spraying method in the biological field, and the manufacture of artificial bones. At present, there are more than 200 clinical cases in China and the results are very good. In addition, artificial teeth made using the thermal spray method have also been initially applied.
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