Technical Introduction
Thermal spraying technology and application
Thermal spraying can provide various special properties such as wear resistance, heat resistance, corrosion resistance, oxidation resistance, sealing, lubrication, insulation, radiation, and room radiation to the surface of the workpiece. Thermal spraying materials are widely used, including ceramics, plastics, non-metallic minerals, and composite materials, in addition to metals and alloys. Thermal spraying can be applied to both metal surfaces and surfaces of materials such as ceramics, glass, plastics, and wood. Therefore, it can be used to repair and reuse old and scrapped parts in equipment maintenance, bringing them back to life. It can also be strengthened and pre protected in new product manufacturing to extend their lifespan. So, thermal spraying technology can be widely applied in many sectors such as aerospace, aviation, machinery, metallurgy, chemical industry, petroleum, coal, railway, textile, and so on.
(1) The application of flame spraying (welding) technology can spray various powders and wires such as metals, alloys, ceramics, plastics, and composite materials. For example, zinc, aluminum, copper, molybdenum, carbon steel, stainless steel, Babbitt alloy, aluminum oxide, chromium oxide, tungsten carbide, chromium carbide, polyethylene, nylon, and so on. Suitable for local repair and strengthening of various mechanical parts, the fusion welding layer obtained by melting the self melting alloy coating greatly improves the density and bonding strength of the coating. Make it have better corrosion resistance and wear resistance, and be able to withstand higher stress.
(2) The application of plasma spraying technology has a wide range of materials, which can spray refractory materials, prepare coatings of difficult to weld metals, ceramics, and metal ceramic composite materials. The coating has high bonding strength and low porosity, and can prepare fine coatings. Mainly used for preparing high-quality coatings with high requirements for corrosion resistance, wear resistance, thermal insulation, insulation, high temperature resistance, and special functional coatings.
(3) Compared with flame wire spraying, electric arc spraying technology has the advantages of high thermal efficiency, high productivity, low spraying cost, and high coating bonding strength. Widely used for spraying zinc and aluminum coatings on steel structures, providing long-term protection for steel structural components. Spraying high-temperature and corrosion-resistant materials on the inner walls of large boilers reduces maintenance and extends service life.
(4) The application of supersonic flame spraying shows significant advantages in spraying materials such as metal carbides and metal alloys due to its ultra-high flame flow velocity and relatively low temperature, making it an important process method for thermal spraying. Performance of supersonic flame spraying coating: The surface roughness of the coating is small, and the hardness of the sprayed tungsten carbide coating can reach HRC75 (HV0.31200). The coating is dense and has high bonding strength. The porosity of general supersonic flame spraying is less than 2%, and the adhesion is ≥ 70Mpa. Mainly used for spraying wear-resistant components such as plungers, gate valves, ball valves, corrugated rollers, conveyor rollers, sinking rollers, paper selection rollers, printing rollers, and power plant boilers.
(5) The application of vacuum fusion welding coating technology is to pre coat a layer of self melting alloy coating on the surface of the workpiece, and then remelt it in a vacuum state to form a strong metallurgical bond between the coating and the substrate. Due to the integral, uniform heating and slow cooling of the processed workpiece, the deformation of the workpiece is small. In addition, the coating is melted under vacuum, and the beneficial substances in the coating are not easily burned. Therefore, the hardness of the coating is stable and can be controlled within HRC20-70.
Application examples of thermal spraying technology:
Introduction and Application of Fluoroplastic Technology
Fluoroplastics were discovered by Dr. Blanchard of DuPont in the 1930s, and later named PTFE and its copolymer coating materials "TEFON" (Chinese translation: Teflon)
Tefulong non stick coating is a series of fluororesins, such as polytetrafluoroethylene (F4) and perfluoroethylene propylene (F46), which are processed and sprayed onto the surface of parts made of various metals (such as iron, aluminum, stainless steel, etc.) and non metals (such as glass, ceramics, etc.) as base materials. After high-temperature plasticization, a certain performance coating is formed, which exhibits its characteristics of heat resistance, cold resistance, drug resistance, corrosion resistance, non adhesiveness, low friction coefficient, good electrical performance, and non flammability. So it has a wide range of applications, from kitchen utensils, various food processing machinery to molds, from machinery to electronics, from chemical equipment to prevention, printing and dyeing, papermaking, and plastic processing industries.
Fluoroplastic non stick anti-corrosion coating is a series of fluororesin film-forming materials sprayed onto the surface of various metals (such as iron, aluminum, stainless steel, etc.) and non metals (such as glass, ceramics, etc.) as the basic components, and then plasticized at high temperature to form a coating with certain properties, exerting its characteristics of heat resistance, cold resistance, drug resistance, corrosion resistance, non adhesiveness, low friction coefficient, good electrical performance, and non flammability. So it is widely used, from kitchen utensils to molds for various food processing machinery; From machinery to electronics, from chemical equipment to prevention, it has applications in industries such as printing, dyeing, papermaking, and plastic processing.
Application examples of fluoroplastic coating:
Introduction to non-metallic coatings
The anti abrasion protective coating for water conservancy machinery has been specifically guided and continuously improved by the inventorWith over 20 years of practical application, we have developed three series and six brands, which can be modified according to specific user requirements. For the Duo Ni Sha River flow power station and pump station; Efficiency improvement of water treatment plants; Contribute to the pre coating of protective gate valves.
The six brands in the three series are:
1. Silicon carbide composite epoxy coating; Epoxy composite smooth coating.
2. Composite nylon spray powder; 012 Nylon powder thermoplastic coating.
3. Multi layer surface polyurethane elastomer at medium and room temperature.
The actual application effect and customer feedback have proven that the anti abrasion protective layer can achieve;
1. Extend the service life of hydraulic machinery flow components in sediment laden rivers by 1-3 times, and make the components reusable.
2. The protective properties of the coating surface provide fresh experience for manufacturing overcurrent components using ordinary steel instead of expensive stainless steel, copper, and other materials.
3. The overcurrent components protected by the coating will not be damaged during a maintenance period, ensuring the stability of hydraulic machinery efficiency.
4. Replacing overcurrent components with protective layers, extremely*The reduction in maintenance costs is generally due to the cost of replacing spare parts1/10-1/60.
The epoxy composite smooth coating has opened up a new way to enhance the efficiency (energy-saving) operation and protection of water pumps, sewage treatment pumps, etc. According to the feedback from the Sino French joint venture Qingdao Hairun Water Supply Company, Shanghai Xinghuo Water Supply Company, and Zhongshan Dafeng Water Supply Company, the efficiency (energy-saving) is 4-8%. When the coated water pump runs for 1000-2000 hours, the saved electricity cost can be used to recover the coating construction cost, and the coating operation time is 18000 hours, with a return on investment of 1:8 or more.
The coating of the three series of coatings can be selected according to the construction conditions. It can be applied to the overcurrent components of the workpiece for protection before leaving the factory, or for repair and protection after installation and application for a period of time. Different temperatures and series varieties can be arranged for coating according to the size of the workpiece.
The three series of coating products have been inspected by the Video Health Supervision and Inspection Institute of Tianjin Health and Epidemic Prevention Center and meet the hygiene and safety evaluation standards for drinking water transmission and distribution equipment and protective materials（The regulations of the 2001 edition.
This product has won the National Invention Award successively2 items; 1 National Invention Gold Award; Two provincial and ministerial level scientific and technological progress awards; One invention patent.
Application of Vacuum Fusion Welding Coating Technology
Vacuum welding is the process of pre coating the surface of a workpiece with a self melting alloy coating, and then remelting it in a vacuum state to form a strong metallurgical bond between the coating and the substrate. Due to the integral, uniform heating and slow cooling of the processed workpiece, the deformation of the workpiece is small. In addition, the coating is melted under vacuum, and the beneficial substances in the coating are not easily burned. Therefore, the hardness of the coating is stable and can be controlled within HRC20-70.
