Basic concepts of thermal spraying
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Basic concepts of thermal spraying: Thermal spraying technology is an important part of surface engineering. It represents a new technique for strengthening and modifying material surfaces, enabling the substrate surface to possess properties such as wear resistance, corrosion resistance, resistance to high-temperature oxidation, electrical insulation, heat insulation, radiation protection, friction reduction, and sealing. In theory, thermal spraying can be applied to any solid material to create thermal spray coatings, and the coating materials can be metals, alloys, ceramics, cermets, plastics, or their composites. Thermal spraying is a coating technology that uses a heat source to heat the coating material to a molten or semi-molten state, simultaneously atomizing it with the help of a flame jet or high-speed gas, and then propelling these atomized particles onto the surface of the substrate to form a coating with specific functions. In recent years, the scope of thermal spraying technology has been expanded. In this approach, certain material particles are accelerated by an air stream to speeds that reach or exceed the critical velocity, without being heated to a molten or semi-molten state. As these particles reach the deposition surface, their high kinetic energy is converted into deformation energy of the particles as well as heat energy, which facilitates strong bonding between the substrate and the particles, as well as between the particles themselves. This so-called “cold spraying” technique has also been included within this field of technology.
Thermal spraying is a method in surface engineering used to enhance the properties of material surfaces, such as wear resistance, corrosion resistance, and high-temperature resistance. It forms a coating by heating the material to a molten or semi-molten state and then spraying it onto the substrate using an air stream. Thermal spraying can be applied to a variety of materials, including metals, alloys, ceramics, and plastics. In recent years, cold spray technology has also been developed; this technique uses high-speed air currents to accelerate particles and spray them onto a substrate without completely melting the material, thereby enabling the formation of a dense coating. .