The so-called thermal spraying technology, in order to improve the nature of the matrix material, using a certain heat source to spray the material melting, and spray to the surface of the matrix material and form a variety of coating technology.

With the development of modern industry, more and more requirements of mechanical equipment of various industrial departments in high energy parameters (such as high temperature, high pressure, high speed, high automation) and poor working conditions (such as severe wear and corrosion etc.) long-term stable operation, therefore, need to improve the surface corrosion resistance; wear resistance and heat resistance. Senior alloy material manufacturing equipment and parts in order to achieve the overall objective of the surface protection and surface strengthening, it is clearly not the economy, sometimes even impossible, so the surface treatment technology research and development of materials is of great significance in technology and economy. Thermal spraying technology is a new surface protection and surface strengthening technology, has been rapid development in the past more than 10 years, thermal spraying technology from the early preparation of general protective coatings to the preparation of various functional coatings, the repair of the product development to mass production of manufactured goods, by a single coating to include product failure analysis, surface pretreatment, coating materials and equipment selection, design and coating system with thermal spraying, system engineering and aerospace industry: this change is by using the most stringent and most stringent requirements, and then quickly spread to the civilian sector.