Surface engineering is a system engineering that changes the morphology, chemical composition, organizational structure and stress state of solid metal surface and non-metal surface after surface pretreatment, through surface coating, surface modification or a variety of surface engineering technology composite treatment, in order to obtain the required surface properties.
Surface engineering integrates basic theory, technology and achievements in many fields. Surface engineering technology makes a layer of coating or film on the surface of the substrate material, or gives the material many special properties through surface modification, so that the surface performance of the material is much better than that of the material matrix, which can not only greatly extend the application field of the substrate material, but also solve the problem that the material can not meet the environmental requirements in many fields. Surface engineering technology plays an irreplaceable role in solving common problems such as resources, energy and environment encountered in human development.
Because surface engineering technology saves energy and materials, it protects the precious resources that human beings rely on for survival, and also plays a very key role in environmental protection. In the 21st century, surface engineering technology will penetrate all walks of life, promote social civilization and improve the quality of life.
Thermal spraying technology is an important branch of surface engineering, it is through flame, arc or plasma and other heat sources, heat a certain line and powder material to melt or semi-melt state, and accelerate the formation of droplets into the substrate at high speed to form a coating. The coating has excellent properties such as wear resistance, corrosion resistance, high temperature and heat insulation, and can repair the part size reduction caused by wear, corrosion or machining error. The application of thermal spraying technology mainly includes four aspects: long-term anticorrosion, mechanical repair and advanced manufacturing technology, mold making and repair, and manufacturing special functional coatings. At present, thermal spraying technology has been widely used in almost all industrial fields and household goods (such as non-stick pans, infrared health heaters, etc.).
At the end of the 20th century, the development of thermal spraying technology was very rapid, and it was quickly promoted and used. By the end of the 20th century, plasma spraying was still dominant. It is worth noting that high-speed flame spraying (HVOF) has developed rapidly and will occupy 25% of the market proportion, ranking second. Arc spraying technology, due to its good economy and superior coating performance than flame spraying layer, will partially replace flame spraying technology to rise to third place.
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